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Zeitschriftenartikel zum Thema „Thermal shock behavior“

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Veröffentlicht am 25. Januar 2025

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1

Purushothama, K., und Dr Shivarudraiah. „Thermal shock and wear behavior of zirconate thermal barrier coatings“. World Journal of Engineering 11, Nr. 6 (01.12.2014): 521–28. http://dx.doi.org/10.1260/1708-5284.11.6.521.

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High temperature thermal shock causes the breakdown of Thermal Barrier Coating (TBC) systems. This paper focusing attention on the Zirconate TBC coating to study the thermo mechanical behavior such as wear and thermal shock test has been conducted inter metallic bond coat and Zirconate TBC to know the wear and thermal characteristics, and wear behavior has been studied on intermetallic bond coat using dry abrasion test and thermal characteristics studied on Zirconate TBC systems using thermal shock resistance test and finally the coatings characteristics before and after thermal cycling were evaluated.

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2

Zhang, Hui, Yan Ruo Hong, Hong Xia Li und Yang Bin. „Thermal Fatigue Behavior of Ladle Purging Plug“. Advanced Materials Research 105-106 (April 2010): 158–61. http://dx.doi.org/10.4028/www.scientific.net/amr.105-106.158.

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The thermal fatigue behavior of alumina-magnesia based and alumina-chromia based purging plug materials are comparatively studied. By comparing thermal shock parameters, the changes of elastic modulus and hot modulus of rupture after thermal shock cycles, we come to a conclusion that microcracks emerge in the alumina-magnesia based material, which hinder the crack growth during thermal shock cycles. The fine-grained and network structure of alumina-magnesia based material are also helpful to improve thermal shock resistance. However, cracks are difficult to form in the alumina-chromia based material but it tends to fracture damage quickly once the cracks nucleation due to coarse-grained structure of alumina-chromia based material.

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3

Lutz, Ekkehard H., Michael V. Swain und Nils Claussen. „Thermal Shock Behavior of Duplex Ceramics“. Journal of the American Ceramic Society 74, Nr. 1 (Januar 1991): 19–24. http://dx.doi.org/10.1111/j.1151-2916.1991.tb07290.x.

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4

Chen, Qingqing, Yuan Zhang, Yu Zhou, Daxin Li und Guobing Ying. „Thermal Shock Behavior of Si3N4/BN Fibrous Monolithic Ceramics“. Materials 16, Nr. 19 (24.09.2023): 6377. http://dx.doi.org/10.3390/ma16196377.

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To develop materials suitable for aerospace applications, silicon nitride/boron nitride (Si3N4/BN) fibrous monolithic ceramics with varying BN contents were prepared. Employing analytical techniques such as XRD and SEM, coupled with mechanical testing equipment, the influence of BN concentration on the thermal shock resistance of Si3N4/BN fibrous monolithic ceramics was assessed. When the thermal shock differential is less than 800 °C, its residual flexural strength gradually decreases as the thermal shock differential increases. Conversely, when the differential exceeds 1000 °C, the residual flexural strength of the material increases. The residual strength of all samples reached its peak after undergoing a thermal shock assessment at a 1500 °C differential. When the BN mass fraction is 5 wt.%, the residual strength after a thermal shock at a temperature difference of 1500 °C is 387 ± 19 MPa, which is 124% higher than the original strength of the sample that did not undergo thermal shock (25 °C, 311 ± 18 MPa). The oxide layer formed on the thermal shock surface played a role in bridging defects introduced during material surface processing.

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5

Li, Zhong Qiu, Li Jie Ci, Tie Cheng Feng und Shao Yan Zhang. „The Thermal Shock Resistance of Mg-PSZ/LaPO₄Ceramics“. Advanced Materials Research 785-786 (September 2013): 187–90. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.187.

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The mechanical properties and thermal shock behavior of Mg-PSZ/LaPO4 ceramics was investigated. The thermal shock resistance of the materials was evaluated by water quenching and a subsequent three-point bending test to determine the flexural strength degradation. Mg-PSZ/15LaPO4 composite showed a higher thermal shock resistance and behaved as a typical refractory. The calculation of thermal shock resistance parameters for the composites and the monolith had indicated possible explanations for the differences in thermal shock behavior.

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Li, Meiheng, Xiaofeng Sun, Wangyu Hu und Hengrong Guan. „Thermal shock behavior of EB-PVD thermal barrier coatings“. Surface and Coatings Technology 201, Nr. 16-17 (Mai 2007): 7387–91. http://dx.doi.org/10.1016/j.surfcoat.2007.02.003.

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7

Seo, Hyoung-IL, Daejong Kim und Kee Sung Lee. „Crack Healing in Mullite-Based EBC during Thermal Shock Cycle“. Coatings 9, Nr. 9 (17.09.2019): 585. http://dx.doi.org/10.3390/coatings9090585.

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Crack healing phenomena were observed in mullite and mullite + Yb2SiO5 environmental barrier coating (EBC) materials during thermal shock cycles. Air plasma spray coating was used to deposit the EBC materials onto a Si bondcoat on a SiCf/SiC composite substrate. This study reveals that unidirectional vertical cracks (mud cracks) formed after several thermal shock cycles; however, the cracks were stable for 5000 thermal shock cycles at a maximum temperature of 1350 °C. Moreover, the crack densities decreased with an increasing number of thermal shock cycles. After 3000 thermal shock cycles, cracks were healed via melting of a phase containing SiO2 phase, which partially filled the gaps of the cracks and resulted in the precipitation of crystalline Al2O3 in the mullite. Post-indentation tests after thermal shock cycling indicated that the mullite-based EBC maintained its initial mechanical behavior compared to Y2SiO5. The indentation load–displacement tests revealed that, among the materials investigated in the present study, the mullite + Yb2SiO5 EBC demonstrated the best durability during repetitive thermal shocks.

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8

Koo, Song Heo, und Young Shin Lee. „The Study of Optimum Shape to Evaluation for Thermal Shock Behavior of Graphite“. Key Engineering Materials 326-328 (Dezember 2006): 915–18. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.915.

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The purpose of the present study is to evaluate thermal shock properties of the ATJ graphite using laser irradiation techniques. Cracks of thermal shock specimens are initiated by maximum tensile stress field. Thermal shock resistance of the ATJ graphite is correlated with thermal parameter and mechanical property. To simulate the thermal stress conditions of rocket nozzle throat for the evaluation of the thermal shock resistance of ATJ graphite, the laser irradiation was applied at the central area of disk specimen. Thermal shock resistance was related to the geometry, the maximum stress, and the thermal and mechanical property. Also the analyses of transient temperature and thermal stress were performed by the finite element method with nonlinear code ABAQUS. Analyses were specially performed for several kinds of shape to determine the minimum power density which could be cracked the specimen. The shape of the thermal shock specimen which was cracked under the lower power density was obtained and the result will be proved to the test.

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9

Rendtorff, Nicolás, Gustavo Suárez, Yesica Bruni, Liliana Garrido und Esteban Fausto Aglietti. „Thermal Shock Behavior of Zircon Based Refractories“. Advances in Science and Technology 70 (Oktober 2010): 59–64. http://dx.doi.org/10.4028/www.scientific.net/ast.70.59.

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In service refractory materials are submitted to local temperature gradients that originate thermal stresses causing a thermal shock (TS) damage to the material. Practical tests for evaluating the thermal shock resistance (TSR) determine the variation or change of some characteristic property of the test sample like E (elastic module) or the strength before and after quenching. In this work, the microstructure and thermal shock behavior of Zircon based refractories are analyzed. Several compositions (eight), from pure Zircon to 70 % of Zircon were studied. The main structural and mechanical properties of the refractories were characterized, as modulus of rupture, elastic modulus, porosity, and microstructure. The dynamic elastic modulus E of the refractories was measured by the excitation technique. The TS behavior was evaluated by measuring the decrease in E and the modulus of rupture, before and after a quenching test. The influence of the presence of other phases was also analyzed. Refractories showed Zircon as the main crystalline phase. In some materials, m-ZrO2 appears coming from Zircon dissociation. The thermal shock behavior of refractory of high Zircon content is typical of the brittle ceramic materials. Materials showed a relation between elastic module and strength. Dynamic elastic modulus measurements have shown to be suitable for evaluation the TSR for these materials.

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10

Yao, Sun Hui, Yan Liang Su, Hung Yu Shu, Chia I. Lee und Zong Ling You. „Comparative Study on Nano-Structural and Traditional Al₂O₃-13TiO₂ Air Plasma Sprayed Coatings and their Thermal Shock Performance“. Key Engineering Materials 739 (Juni 2017): 103–7. http://dx.doi.org/10.4028/www.scientific.net/kem.739.103.

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This paper reports a comparative study on characterization and thermal shock behavior of air plasma sprayed Al2O3-13wt.%TiO2 coatings using two kinds of raw materials, i.e. nanostructural and micro-structural (traditional) feedstock powders. The characterization, before and after thermal shock test, was carried out using micro-Vickers hardness tester, XRD and SEM. The thermal shock test was carried out using a water quenching method by employing cyclic heat treatment between ambient temperature and 650°C in air. The results showed that in spite of having denser structure, the nanostructural coating showed hardness a little lower than the traditional one at both conditions of before and after thermal shock tests. However, the nanostructural coating showed very good thermal shock behaviour.

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Luțcanu, Marian, Ramona Cimpoeșu, Mărioara Abrudeanu, Corneliu Munteanu, Sorin Georgian Moga, Margareta Coteata, Georgeta Zegan, Marcelin Benchea, Nicanor Cimpoeșu und Alice Mirela Murariu. „Mechanical Properties and Thermal Shock Behavior of Al2O3-YSZ Ceramic Layers Obtained by Atmospheric Plasma Spraying“. Crystals 13, Nr. 4 (03.04.2023): 614. http://dx.doi.org/10.3390/cryst13040614.

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Ceramic coatings have many advantages for industrial and medical applications due to their exceptional properties. Ceramic coatings with a thickness of approximately 45 μm, after grinding, were grown using a robotic arm that used the atmospheric plasma spraying procedure. The thermal shock stresses—a common situation in applications but difficult to reproduce under laboratory conditions—of the ceramic layers on top of the metal substrate was achieved using solar energy focused by a concentrating mirror, based on experiments conducted in the CNRS-PROMES laboratory, UPR 8521, belonging to the French National Centre for Scientific Research (CNRS). The ceramic layers showed excellent stability at 1000 °C, even at high heating or cooling rates. At high temperatures (above 1800 °C), the exfoliation of the complex ceramic layer was observed. No differences in the structural, phase, mechanical or adhesion properties of the ceramic layer were observed after the thermal shock cycles (in the literature, there have been quite few reports regarding the properties of the ceramic layers after the thermal shock application). Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), atomic force microscopy (AFM) and X-ray diffraction (XRD) techniques were used to characterize the complex ceramic coating and the effects of thermal shock cycling. The phases and chemical composition of the complex coatings remained similar, insensitive to thermal shock at 1000 °C, consisting of a mixture of crystalline yttrium zirconium oxide and α and γ alumina. For all cases, the main residual stress state was tensile. After 5 or 10 cycles of thermal shocks, a smoothing of the residual stress state was observed in the investigated area. A higher temperature (above 1800 °C), applied as thermal shock, led to higher residual stresses and resulted in large cracks and the spallation of the coating layer.

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Sahlaoui, Habib, Kamel Makhlouf und Habib Sidhom. „Comparative Study of the Thermal Shock Resistance of an Industrial Tableware Porcelain“. Journal of Engineering 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/972019.

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The effect of the glazed layer and firing conditions (temperature and duration) on the thermal shocks behavior of tableware porcelains has been studied. Two types of glazed layers and three firing conditions, used industrially in the commercial porcelains manufacture, are used in this investigation. Repeated thermal shock tests showed that the glazed layer with higher alumina/silica ratio is more resistant to thermal shocks and that the slow firing cycle, even at a relatively low temperature, is very beneficial for the thermal shock resistance of the porcelain matrix. Three-point bending tests showed that the crazing phenomenon, which affects the glazed layers as well as the porcelain matrix, does not affect significantly the mechanical resistance of these materials.

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13

Liu, Chun Feng, Feng Ye, Yu Zhou, Yu Dong Huang und Jian Min Zhou. „Thermal Shock Behavior of Nd-Doped α-Sialon Ceramics“. Key Engineering Materials 434-435 (März 2010): 130–33. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.130.

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Nd--sialons with the stoichiometric composition of Nd0.333Si10Al¬2ON15 were obtained by hot-press sintering at 1800°C for 1h. The thermal shock behavior of the Nd--sialons was examined by a water-quenching technique. The influence of the thermal shock temperature difference (T) and cycle times on the residual strength was evaluated. Equiaxed -sialon grains formed together with a small amount of intergranular phase M (Nd2Si3-xAl¬xO3+xN4-x) and -sialon phase. The residual strength after a thermal shock tended to decrease gradually with increasing T above 500°C. However, the specimens exhibited an improved residual strength (~94% of the room temperature strength) after a thermal shock of T=1100°C. The residual strength presented a gradual decrease with increasing the thermal shock cycle times at T=1100°C, and was still remained ~55% of the room temperature strength after 11-time cycle. It is contributed to the surface oxidation which may results in the healing of surface cracks and the generation of surface compressive stresses.

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14

Colombo, Paolo, John R. Hellmann und David L. Shelleman. „Thermal Shock Behavior of Silicon Oxycarbide Foams“. Journal of the American Ceramic Society 85, Nr. 9 (September 2002): 2306–12. http://dx.doi.org/10.1111/j.1151-2916.2002.tb00452.x.

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15

Music, Denis, und Bastian Stelzer. „Intrinsic Thermal Shock Behavior of Common Rutile Oxides“. Physics 1, Nr. 2 (28.08.2019): 290–300. http://dx.doi.org/10.3390/physics1020022.

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Rutile TiO2, VO2, CrO2, MnO2, NbO2, RuO2, RhO2, TaO2, OsO2, IrO2, SnO2, PbO2, SiO2, and GeO2 (space group P42/mnm) were explored for thermal shock resistance applications using density functional theory in conjunction with acoustic phonon models. Four relevant thermomechanical properties were calculated, namely thermal conductivity, Poisson’s ratio, the linear coefficient of thermal expansion, and elastic modulus. The thermal conductivity exhibited a parabolic relationship with the linear coefficient of thermal expansion and the extremes were delineated by SiO2 (the smallest linear coefficient of thermal expansion and the largest thermal conductivity) and PbO2 (vice versa). It is suggested that stronger bonding in SiO2 than PbO2 is responsible for such behavior. This also gave rise to the largest elastic modulus of SiO2 in this group of rutile oxides. Finally, the intrinsic thermal shock resistance was the largest for SiO2, exceeding some of the competitive phases such as Al2O3 and nanolaminated Ti3SiC2.

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16

LIU, ZI WEI, WEI WU, JIA JIE HUA, CHU CHENG LIN, XUE BIN ZHENG und YI ZENG. „THERMAL SHOCK BEHAVIOR OF AIR PLASMA SPRAYED CoNiCrAlY/YSZ THERMAL BARRIER COATINGS“. Surface Review and Letters 21, Nr. 05 (29.09.2014): 1450069. http://dx.doi.org/10.1142/s0218625x14500693.

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The structural changes and failure mechanism of thermal barrier coatings (TBCs) during thermal shock cycling were investigated. TBCs consisting of CoNiCrAlY bond coat and partially yttria-stabilized zirconia (YSZ) top coat were deposited by atmospheric plasma spraying (APS) on a nickel-based alloy substrate and its thermal shock resistance performance was evaluated. TBCs were heated at 1100°C for 15 min followed by cold water quenching to ambient temperature. Microstructural evaluation and elemental analysis of TBCs were performed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), respectively. The crack features of YSZ coatings in TBCs during thermal shock cycling, including those of horizontal (parallel to the substrate) and vertical cracks (perpendicular to the substrate), were particularly investigated by means of SEM and image analysis. Results show that horizontal and vertical cracks have different influences on the thermal shock resistance of the coatings. Horizontal cracks that occur at the interface of YSZ and thermally growth oxidation (TGO) cause partial or large-area spalling of coatings. When vertical and horizontal cracks encounter, network segments are formed which lead to partial spalling of the coatings.

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Kirchhoff, G., M. Holzherr, U. Bast und U. Rettig. „Thermal Shock and Thermal Cycling Behavior of Silicon Nitride Ceramics“. Key Engineering Materials 89-91 (August 1993): 605–10. http://dx.doi.org/10.4028/www.scientific.net/kem.89-91.605.

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18

Huang, Jibo, Wen Sun, Renzhong Huang und Wenhua Ma. „Cracking Behavior of Atmospheric Plasma-Sprayed 8YSZ Thermal Barrier Coatings during Thermal Shock Test“. Coatings 13, Nr. 2 (20.01.2023): 243. http://dx.doi.org/10.3390/coatings13020243.

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The failure of plasma-sprayed thermal barrier coatings (TBCs) during service is usually related to the cracking behavior. In this study, plasma-sprayed TBCs were prepared with two kinds of agglomerated sintered yttria-stabilized zirconia (YSZ) powders with different particle sizes. The evolution of mechanical properties and crack propagation behavior of the coatings during the whole life stage were studied by a thermal shock test. The effect of powder particle size on the cracking behavior of the TBCs during thermal shock was analyzed from the aspect of pore structure, mechanical properties, and stress state of the coatings. The crack propagation and coalescence in the direction parallel to the substrate in the coating is the main factor leading to the spalling failure of the coating during thermal shock. Although the coating prepared by fine YSZ has higher fracture toughness, the lower strain tolerance will increase the cracking driving force on the crack tip of the coating during thermal shock, and the cracks in the coating propagate merge at a faster rate during thermal shock. The larger porosity and pore size of the coating prepared by coarse YSZ help the coating suffer less thermal stress during thermal shock. Although the existence of pores reduces the fracture toughness of the coating to a certain extent, the increase of strain tolerance reduces the crack growth rate in the coating, so the coating has a longer life.

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Sun, Tian Tian, Yan Xia Wang, Hai Yun, Dong Huan Zhang und Qing Hui Shang. „Determining the Thermal Shock Elastic Behavior of Mullite Ceramic Regenerator Material by Ultrasonic Testing“. Key Engineering Materials 633 (November 2014): 472–75. http://dx.doi.org/10.4028/www.scientific.net/kem.633.472.

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Mullite material is a material commonly used in honeycomb regenerator, because in the process of using material under big temperature difference effect, so have a great demand for its thermal shock resistance. The used mullite ceramics were made by the direct solid phase sintering method, and the modulus of elasticity of the mullite ceramics measured by ultrasonic pulse-echo method in a thermal shock and thermal fatigue experiment, respectively. In the air-cooling condition, the study found the mullite ceramic without thermal shock that the longitudinal wave velocity and shear wave velocity respectively 3970(m/s) and 2492(m/s). After 45 times thermal shock of temperature difference of 800°C, longitudinal wave velocity and shear wave velocity decreased to 3910(m/s) and 2457(m/s), and the value of the modulus of elasticity changed 1020MPa. By observing the change of the elastic modulus value rule, can know the elastic deformation of thermal shock on the material performance of thermal shock damage. Moreover, the results can provide the data basis for the calculation of the residual strength and the numerical simulation of thermal stress.

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Posarac, Milica, A. Devecerski, T. Volkov-Husovic, B. Matovic und D. M. Minic. „The effect of Y2O3 addition on thermal shock behavior of magnesium aluminate spinel“. Science of Sintering 41, Nr. 1 (2009): 75–81. http://dx.doi.org/10.2298/sos0901075p.

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The effect of yttria additive on the thermal shock behavior of magnesium aluminate spinel has been investigated. As a starting material we used spinel (MgAl2O4) obtained by the modified glycine nitrate procedure (MGNP). Sintered products were characterized in terms of phase analysis, densities, thermal shock, monitoring the damaged surface area in the refractory specimen during thermal shock and ultrasonic determination of the Dynamic Young modulus of elasticity. It was found that a new phase between yttria and alumina is formed, which improved thermal shock properties of the spinel refractories. Also densification of samples is enhanced by yttria addition.

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Dusza, Ján. „High Temperature Behavior of Coatings and Layered Ceramics“. Key Engineering Materials 333 (März 2007): 167–76. http://dx.doi.org/10.4028/www.scientific.net/kem.333.167.

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The present contribution summarizes the recent results in the field of high temperature properties of layered ceramics and thermal barrier coatings (TBC), mainly as regards their thermal shock resistance and creep characteristics. The thermal shock and creep behavior of layered ceramics are discussed with the main focus on the influence of layered composition and interlayer boundary on the creep behavior of the composite. In the last part the high temperature deformation and creep of TBC’s are discussed.

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22

Journal, Baghdad Science. „Titania Effect on Sintering behavior of Alumina“. Baghdad Science Journal 6, Nr. 4 (06.12.2009): 770–74. http://dx.doi.org/10.21123/bsj.6.4.770-774.

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The sintering behavior of Alumina was investigated by adding TiO2. The addition of TiO2 lowered the sintering temperature of the Alumina compared with those of pure Alumina. The result suggests that TiO2 acts as an activator for sintering of Alumina. Water absorption, apparent porosity and density were examined for both pure and TiO2 added to Alumina samples. The variations of sintering behavior were discussed in terms of shrinkage, porosity, water absorption and density. Thermal shock resistance was also examined. In term of this work, the way of improving the thermal shock resistance in oxide- based materials by adding reactive Titania powder to the Alumina samples. The laboratory results showed an improvement in thermal shock resistance property of the products which open the horizon of development of the final products.

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Saleh, Qasid Abdul Sattar. „Titania Effect on Sintering behavior of Alumina“. Baghdad Science Journal 6, Nr. 4 (06.12.2009): 770–74. http://dx.doi.org/10.21123/bsj.2009.6.4.770-774.

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The sintering behavior of Alumina was investigated by adding TiO2. The addition of TiO2 lowered the sintering temperature of the Alumina compared with those of pure Alumina. The result suggests that TiO2 acts as an activator for sintering of Alumina. Water absorption, apparent porosity and density were examined for both pure and TiO2 added to Alumina samples. The variations of sintering behavior were discussed in terms of shrinkage, porosity, water absorption and density. Thermal shock resistance was also examined. In term of this work, the way of improving the thermal shock resistance in oxide- based materials by adding reactive Titania powder to the Alumina samples. The laboratory results showed an improvement in thermal shock resistance property of the products which open the horizon of development of the final products.

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LI, WEIGUO, und DAINING FANG. „EFFECTS OF THERMAL ENVIRONMENTS ON THE THERMAL SHOCK RESISTANCE OF ULTRA-HIGH TEMPERATURE CERAMICS“. Modern Physics Letters B 22, Nr. 14 (10.06.2008): 1375–80. http://dx.doi.org/10.1142/s021798490801608x.

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In the present study, the temperature-dependent thermal shock resistance parameter of Ultra-High Temperature Ceramics (UHTCs) was measured based on the current evaluation theories of thermal shock resistance parameters, since the material parameters of UHTCs are very sensitive to the changes of temperature. The influence of some important thermal environment parameters on the thermal shock resistance and critical temperature difference of rupture of UHTCs were studied. By establishing the relation between the temperature and the thermal or mechanical properties of the UHTCs, we found that thermal shock behavior of UHTCs is strongly affected by the surface heat transfer coefficient, heat transfer condition and initial temperature of the thermal shock.

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25

Yagawa, G., Y. Ando, K. Ishihara, T. Iwadate und Y. Tanaka. „Stable and Unstable Crack Growth of A508 Class 3 Plates Subjected to Combined Force of Thermal Shock and Tension“. Journal of Pressure Vessel Technology 111, Nr. 3 (01.08.1989): 234–40. http://dx.doi.org/10.1115/1.3265669.

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An urgent problem for nuclear power plants is to assess the structural integrity of the reactor pressure vessel under pressurized thermal shock. In order to estimate crack behavior under combined force of thermal shock and tension simulating pressurized thermal shock, two series of experiments are demonstrated: one to study the effect of material deterioration due to neutron irradiation on the fracture behavior, and the other to study the effect of system compliance on fracture behavior. The test results are discussed with the three-dimensional elastic-plastic fracture parameters, J and Jˆ integrals.

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She, Jihong, Tatsuki Ohji und Zhen-Yan Deng. „Thermal Shock Behavior of Porous Silicon Carbide Ceramics“. Journal of the American Ceramic Society 85, Nr. 8 (August 2002): 2125–27. http://dx.doi.org/10.1111/j.1151-2916.2002.tb00418.x.

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27

Jin, Xinxin, Xinghong Zhang, Jiecai Han, Ping Hu und Rujie He. „Thermal shock behavior of porous ZrB2–SiC ceramics“. Materials Science and Engineering: A 588 (Dezember 2013): 175–80. http://dx.doi.org/10.1016/j.msea.2013.09.046.

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Wang, Lin, Jian-Lin Shi, Ming-Tong Lin, Hang-Rong Chen und Dong-Sheng Yan. „The thermal shock behavior of alumina-copper composite“. Materials Research Bulletin 36, Nr. 5-6 (März 2001): 925–32. http://dx.doi.org/10.1016/s0025-5408(01)00549-9.

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Aldridge, Matthew, und Julie A. Yeomans. „Thermal Shock Behavior of Iron-Particle-Toughened Alumina“. Journal of the American Ceramic Society 84, Nr. 3 (März 2001): 603–7. http://dx.doi.org/10.1111/j.1151-2916.2001.tb00706.x.

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Li, Shibo, Haolin Li, Yang Zhou und Hongxiang Zhai. „Mechanism for abnormal thermal shock behavior of Cr2AlC“. Journal of the European Ceramic Society 34, Nr. 5 (Mai 2014): 1083–88. http://dx.doi.org/10.1016/j.jeurceramsoc.2013.12.003.

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31

Tian, Chunyan, Hai Jiang und Ning Liu. „Thermal shock behavior of Si3N4–TiN nano-composites“. International Journal of Refractory Metals and Hard Materials 29, Nr. 1 (Januar 2011): 14–20. http://dx.doi.org/10.1016/j.ijrmhm.2010.06.006.

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Muccillo, R., E. N. S. Muccillo und N. H. Saito. „Thermal shock behavior of ZrO2:MgO solid electrolytes“. Materials Letters 34, Nr. 3-6 (März 1998): 128–32. http://dx.doi.org/10.1016/s0167-577x(97)00152-3.

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33

Zhang, H. B., Y. C. Zhou, Y. W. Bao und M. S. Li. „Abnormal thermal shock behavior of Ti3SiC2 and Ti3AlC2“. Journal of Materials Research 21, Nr. 09 (September 2006): 2401–7. http://dx.doi.org/10.1557/jmr.2006.0289.

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ASHIZUKA, Masahiro, Yasuyuki KIMURA, Hideki FUJII, Kouichi ABE und Yoshitaka KUBOTA. „Thermal Shock Behavior of Y2O3-Partially Stabilized Zirconia“. Journal of the Ceramic Association, Japan 94, Nr. 1090 (1986): 577–82. http://dx.doi.org/10.2109/jcersj1950.94.1090_577.

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35

KOGO, Yasuo, Kazutoshi NAKAZAKI, Takumi KATAGIRI und Hiroshi HATTA. „137 Thermal Shock Behavior of C/C Composite“. Proceedings of the Materials and processing conference 2001.9 (2001): 291–92. http://dx.doi.org/10.1299/jsmemp.2001.9.291.

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36

Wang, Bao-Lin, und Yiu-Wing Mai. „On Thermal Shock Behavior of Functionally Graded Materials“. Journal of Thermal Stresses 30, Nr. 6 (20.04.2007): 523–58. http://dx.doi.org/10.1080/01495730701273981.

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37

Orenstein, Robert M., und David J. Green. „Thermal Shock Behavior of Open-Cell Ceramic Foams“. Journal of the American Ceramic Society 75, Nr. 7 (Juli 1992): 1899–905. http://dx.doi.org/10.1111/j.1151-2916.1992.tb07214.x.

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38

Ashizuka, Masahiro, Yasuyuki Kimura, Hideki Fujii, Kouichi Abe und Yoshitaka Kubota. „Thermal shock behavior of Y2O3-partially stabilized zirconia“. International Journal of High Technology Ceramics 3, Nr. 1 (Januar 1987): 86–87. http://dx.doi.org/10.1016/0267-3762(87)90076-2.

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39

Tian, Chunyan, Ning Liu und Maohu Lu. „Thermal shock and thermal fatigue behavior of Si3N4–TiC nano-composites“. International Journal of Refractory Metals and Hard Materials 26, Nr. 5 (September 2008): 478–84. http://dx.doi.org/10.1016/j.ijrmhm.2007.11.004.

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Zhang, Hongye, Zhanwei Liu, Xiaobo Yang und Huimin Xie. „Interface failure behavior of YSZ thermal barrier coatings during thermal shock“. Journal of Alloys and Compounds 779 (März 2019): 686–97. http://dx.doi.org/10.1016/j.jallcom.2018.11.311.

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41

Zhong, Xin, Ya Ran Niu, Tao Zhu, Hong Li, Xue Bin Zheng und Jin Liang Sun. „Thermal Shock Resistance of Yb₂SiO₅/Si and Yb₂Si₂O₇/Si Coatings Deposited on C/SiC Composites“. Solid State Phenomena 281 (August 2018): 472–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.472.

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Rare-earth silicates, especially ytterbium silicate (Yb2SiO5and Yb2Si2O7), have been developed for promising environmental barrier coatings (EBCs) for SiC-matrix composites. In this study, double-layer Yb2SiO5/Si and Yb2Si2O7/Si EBC systems were deposited on C/SiC composites by air plasma spray (APS) technique, respectively. Both systems were subjected to thermal shock tests at 1400 °C. The evolution of phase composition and microstructure of those samples before and after thermal shock test were characterized. Results showed that there were penetrating microcracks in the top Yb2SiO5layer and horizontal microcracks at the Yb2SiO5-Si interface after thermal shock test. While extremely few microcracks and no horizontal microcracks were presented in the Yb2Si2O7/Si sample. The EDS analysis also showed that the Si bond layer of the Yb2SiO5/Si sample was oxidized more serious than that of the Yb2Si2O7/Si sample. The different thermal shock behaviors of both systems were clarified based on the thermal expansion behavior, phase composition and microstructure analysis.

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Lu, Guan Xiong, Li Jun Hao und Fu Xing Ye. „Thermal Analysis and Failure Behavior of 8YSZ Thermal Barrier Coatings under Thermal Cycling Tests“. Applied Mechanics and Materials 441 (Dezember 2013): 91–95. http://dx.doi.org/10.4028/www.scientific.net/amm.441.91.

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In this study, thermal analysis and thermal shock test of 8wt.% yttria stablized zirconia (8YSZ) thermal barrier coatings (TBCs) on low heat rejection (LHR) diesel engine have been conducted. The influence of TBCs on temperature distribution of piston was discussed by employing ANSYS codes. The thermal shock resistance test was carried out by placing the samples under flame jet heating and compressed air cooling in turn. Two kinds of thermal cycling modes with different periods were used to investigate the role of cycling frequency in coatings failure. As the frequency rose, the service life of coatings significantly decreased. The spallation of coatings happened at the interface between bond coat and substrate. The stress calculation results indicated that considerable stress caused by thermal mismatch was one of the main reasons for TBCs failure. The heat affected zone (HAZ) under the bond coat inhibited the diffusion between the bond coat and substrate. The oxide layer consisting of Mg and Al oxides under the HAZ was harmful to the bond between bond coat and substrate, which was another main reason for the spallation of coatings.

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Song, Dowon, Taeseup Song, Ungyu Paik, Guanlin Lyu, Yeon-Gil Jung, Baig-Gyu Choi, In-Soo Kim und Jing Zhang. „Crack-Resistance Behavior of an Encapsulated, Healing Agent Embedded Buffer Layer on Self-Healing Thermal Barrier Coatings“. Coatings 9, Nr. 6 (31.05.2019): 358. http://dx.doi.org/10.3390/coatings9060358.

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In this work, a novel thermal barrier coating (TBC) system is proposed that embeds silicon particles in coating as a crack-healing agent. The healing agent is encapsulated to avoid unintended reactions and premature oxidation. Thermal durability of the developed TBCs is evaluated through cyclic thermal fatigue and jet engine thermal shock tests. Moreover, artificial cracks are introduced into the buffer layer’s cross section using a microhardness indentation method. Then, the indented TBC specimens are subject to heat treatment to investigate their crack-resisting behavior in detail. The TBC specimens with the embedded healing agents exhibit a relatively better thermal fatigue resistance than the conventional TBCs. The encapsulated healing agent protects rapid large crack openings under thermal shock conditions. Different crack-resisting behaviors and mechanisms are proposed depending on the embedding healing agents.

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Jamali, Hossein, Reza Mozafarinia, Reza Shoja Razavi und Raheleh Ahmadi Pidani. „Investigation of Thermal Shock Behavior of Plasma-Sprayed NiCoCrAlY/YSZ Thermal Barrier Coatings“. Advanced Materials Research 472-475 (Februar 2012): 246–50. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.246.

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ZrO2-8wt.%Y2O3 (8YSZ) thermal barrier coatings (TBCs) were deposited by atmospheric plasma spraying (APS) on NiCoCrAlY-coated Inconel 738LC substrates. The thermal shock behavior was investigated by quenching the samples in water with temperature of 20-25°C from 950°C. To study of failure mechanism results from thermal cycling, microstructural evaluation using scanning electron microscope (SEM), elemental analysis using energy dispersive spectroscopy (EDS) and phasic analysis using x-ray diffractometry (XRD) were done. The results revealed that failure of the TBC system was due to the spallation of ceramic top coat. Thermal mismatch stress was the major factor of TBC failure in thermal shock test.

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Liu, Xiaochong, Xiaojun Guo, Youliang Xu, Longbiao Li, Wang Zhu, Yuqi Zeng, Jian Li, Xiao Luo und Xiaoan Hu. „Cyclic Thermal Shock Damage Behavior in CVI SiC/SiC High-Pressure Turbine Twin Guide Vanes“. Materials 14, Nr. 20 (15.10.2021): 6104. http://dx.doi.org/10.3390/ma14206104.

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In this paper, the SiC/SiC high-pressure turbine twin guide vanes were fabricated using the chemical vapor infiltration (CVI) method. Cyclic thermal shock tests at different target temperatures (i.e., 1400, 1450, and 1480 °C) in a gas environment were conducted to investigate the damage mechanisms and failure modes. During the thermal shock test, large spalling areas appeared on the leading edge and back region. After 400 thermal shock cycles, the spalling area of the coating at the basin and back region of the guide vane was more than 30%, and the whole guide vane turned gray, due to the formation of SiO2. When the thermal shock temperature increased from 1400 to 1450 and 1480 °C, the spalling area of the basin and the back region of the guide vane did not increase significantly, but the delamination occurred at the tenon, upper surface of the guide vane near the trailing edge of the guide vane. Through the X-ray Computed Tomography (XCT) analysis for the guide vanes before and after thermal shock, there was no obvious damage inside of guide vanes. The oxidation of SiC coating and the formation of SiO2 protects the internal fibers from oxidation and damage. Further investigation on the effect of thermal shock on the mechanical properties of SiC/SiC composites should be conducted in the future.

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Mardoukhi, Ahmad, Timo Saksala, Mikko Hokka und Veli-Tapani Kuokkala. „A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading“. Rakenteiden Mekaniikka 50, Nr. 2 (05.08.2017): 41–62. http://dx.doi.org/10.23998/rm.65301.

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This paper presents a numerical and experimental study on the mechanical behavior of plasma shocked rock. The dynamic tensile behavior of plasma shock treated Balmoral Red granite was studied under dynamic loading using the Brazilian disc test and the Split Hopkinson Pressure Bar device. Different heat shocks were produced on the Brazilian disc samples by moving the plasma gun over the sample at different speeds. Microscopy clearly showed that as the duration of the thermal shock increases, the number of the surface cracks and their complexity increases (quantified here as the fractal dimension of the crack patterns) and the area of the damaged surface grows larger as well. At the highest thermal shock duration of 0.80 seconds the tensile strength of the Brazilian disc sample drops by approximately 20%. In the numerical simulations of the dynamic Brazilian disc test, this decrease in tensile strength was reproduced by modeling the plasma shock induced damage using the embedded discontinuity finite element method. The damage caused by the plasma shock was modeled by two methods, namely by pre-embedded discontinuity populations with zero strength and by assuming that the rock strength is lowered and conform to the Weibull distribution. This paper presents a quantitative assessment of the effects of the heat shock, the surface microstructure and mechanical behavior of the studied rock, and a promising numerical model to account for the pre-existing crack distributions in a rock material.

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ZHANG, XINGHONG, ZHI WANG, XIN SUN, WENBO HAN und CHANGQING HONG. „THERMAL SHOCK BEHAVIOR OF ZrB2-20vol.%SiC-15vol.% GRAPHITE FLAKE BY HOT PRESSING“. International Journal of Modern Physics B 23, Nr. 06n07 (20.03.2009): 1160–65. http://dx.doi.org/10.1142/s0217979209060622.

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The thermal shock behavior of hot-pressed ZrB 2- SiC composite containing 15vol.% graphite flake ( ZrB 2- SiC - G ) was investigated. The thermal shock testing was carried out by means of quenching into water from high temperatures (Δ T in the range of 200-1000°C). The damage introduced by the thermal shock was characterized by the degradation of bending strength. The residual strength exhibited a complex evolution and could be divided into three zones according to the variation of the temperature difference: (i) no damage zone (200-300°C), (ii) strength degradation zone (300-400°C), and (iii) low stable strength zone (400-1000°C). The minimum residual strength of 160 MPa, higher than 40% of the initial strength of 396 MPa, was obtained in the third zone of temperature difference. The surface feature of ZrB 2- SiC - G composite after the thermal shock tests was also investigated.

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Shen, Qiang, Chang Lian Chen, Fei Chen, Qi Wen Liu und Lian Meng Zhang. „Thermal Shock Behavior of Calcia Stabilized Zirconia Ceramics with Porosity Gradient Structure“. Materials Science Forum 631-632 (Oktober 2009): 435–40. http://dx.doi.org/10.4028/www.scientific.net/msf.631-632.435.

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Porous calcia stabilized zirconia ceramics (CSZC) with closed pores were presurelessly sintered by adding different contents of zirconia hollow balls. CSZC FGM with porosity gradient structure was then fabricated by laminating five layers with designed contents of zirconia hollow balls. The porosity, microstructure, and bending strength of the obtained CSZC samples were characterized. The results show that the hollow balls distribute uniformly and are well bonded with the matrix, and the porous structure is mainly composed of closed pores. The porosity of the CSZC increases linearly from 5.7 % to 31.6 % when the content of zirconia hollow balls increases from 0 % to 30 %, and the bending strength decreases rapidly from 297 MPa to 30 MPa. The thermal shock behavior of the CSZC and FGM was evaluated using air-quenching technique. It is shown that the residual bending strength of the quenched samples increases after several quenching cycles, and the samples are damaged by thermal shock after eight thermal cycles because of the production of monoclinic zirconia. FGM samples with porosity gradient structure can endure above twelve thermal shock cycles and exhibits better thermal shock resistance.

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Liu, Gu, Liu Ying Wang, Wei Wang und Yong Fa Wu. „Microstructure and Properties of Thermal Sprayed ZrO₂-NiCr Coatings“. Materials Science Forum 809-810 (Dezember 2014): 546–49. http://dx.doi.org/10.4028/www.scientific.net/msf.809-810.546.

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NiCr/ZrO2gradated coatings were obtained on C45 carbon steel by high velocity arc spraying and micro-plasma spraying to improve the mechanical and thermal behaviors of the carbon steel. Scanning electronic microscope (SEM) and X-ray diffraction (XRD) were employed to characterize the microstructure of the prepared composite coatings. Mechanical properties including hardness and bonding strength were also evaluated by microhardness tester and electron tensile tester. The thermal shock behaviors were investigated by quenching the coating samples in cold water from 900 °C and 1100 °C, respectively. The oxidation of NiCr/ZrO2gradated coating and C45 carbon steel substrate were carried out for up to 108 hours in air atmosphere at 1100°C. The oxidation behaviors were investigated after detailed examinations by thermal gravimetric analysis. Experimental results indicate that NiCr/ZrO2gradated coating exhibit a much higher hardness and high temperature oxidation behavior than the substrate. The bonding strength and thermal shock behavior of NiCr/ZrO2are superior to pure ZrO2coating, which could be mainly attributed to the NiCr intermediate graded layer due to the microstructure improvement and relaxation of residual stress concentration.

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Guo, Xingye, Zhe Lu, Yeon-Gil Jung, Li Li, James Knapp und Jing Zhang. „Thermal Properties, Thermal Shock, and Thermal Cycling Behavior of Lanthanum Zirconate-Based Thermal Barrier Coatings“. Metallurgical and Materials Transactions E 3, Nr. 2 (29.03.2016): 64–70. http://dx.doi.org/10.1007/s40553-016-0070-4.

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