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Journal articles on the topic 'Thermal and mechanical stability'

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Author: Grafiati

Published: 23 September 2022

Last updated: 28 January 2023

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1

Khan, Aamir, Muneer Baig, and Abdulhakim AlMajid. "Effect of Transition Metals on Thermal Stability and Mechanical Properties of Aluminum." International Journal of Materials, Mechanics and Manufacturing 6, no. 6 (December 2018): 369–72. http://dx.doi.org/10.18178/ijmmm.2018.6.6.409.

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2

Nikitin, I., I. Altenberger, H. J. Maier, and B. Scholtes. "Mechanical and thermal stability of mechanically induced near-surface nanostructures." Materials Science and Engineering: A 403, no. 1-2 (August 2005): 318–27. http://dx.doi.org/10.1016/j.msea.2005.05.030.

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3

Fabrizi, A., Marcello Cabibbo, R. Cecchini, S. Spigarelli, C. Paternoster, Marie Haidopoulo, and P. V. Kiryukhantsev-Korneev. "Thermal Stability of Nanostructured Coatings." Materials Science Forum 653 (June 2010): 1–22. http://dx.doi.org/10.4028/www.scientific.net/msf.653.1.

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This paper is a review of the thermal stability of nanostructured nitride coatings synthesised by reactive magnetron sputtering technique. In the last three decade, nitride based coatings have been widely applied as hard wear-protective coatings in mechanical components. More recently, a larger interest has been addressed to evaluate the thermal stability of such coatings, as their mechanical and tribological properties are deteriorated at high working temperatures. This study describes the microstructural, mechanical and compositional stability of nano-crystalline Cr-N and nano-composited Ti-N based coatings (Ti-Al-Si-B-N and Ti-Cr-B-N) after air and vacuum annealing. For Cr-N coatings annealing in vacuum induces phase transformation from CrN to Cr2N, while after annealing in air only Cr2O3 phase is present. For Ti-N based coatings, a well-definite multilayered structure was shown after air annealing. Degradation of mechanical properties was observed for all the nitride coatings after thermal annealing in air.

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4

Klinger, Leonid, and Eugen Rabkin. "Thermal and Mechanical Stability of Polycrystalline Nanowires." Defect and Diffusion Forum 264 (April 2007): 133–40. http://dx.doi.org/10.4028/www.scientific.net/ddf.264.133.

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We considered a polycrystalline cylindrical nanowire with bamboo microstructure strained uniaxially by an external load. Our molecular dynamic computer simulations demonstrated that grain boundary grooving plays an important role in determining the morphological stability of nanowires. Also, an exceptionally high yield stress of nanowires emphasizes the importance of diffusion in their plastic deformation under applied load. We formulated a phenomenological diffusion-based model describing morphological stability and diffusion-controlled deformation behaviour of polycrystalline nanowires. The kinetics of the shape changes was calculated numerically.

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5

Shchavelev, O. S., K. O. Shchavelev, N. A. Yakobson, and Uk Kang. "Thermal stability and mechanical strength of glasses." Journal of Optical Technology 68, no. 11 (November 1, 2001): 836. http://dx.doi.org/10.1364/jot.68.000836.

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6

Rudolphi, Mario, Mathias Christian Galetz, and Michael Schütze. "Mechanical Stability Diagrams for Thermal Barrier Coating Systems." Journal of Thermal Spray Technology 30, no. 3 (February 2021): 694–707. http://dx.doi.org/10.1007/s11666-021-01163-5.

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AbstractLoss of mechanical integrity due to thermal aging and subsequent spallation of the ceramic top layer is one of the dominant failure mechanisms in thermal barrier coating systems. In order to predict and avoid such mechanical failure, a strain-based lifetime assessment model is presented for a novel double-layer thermal barrier system. The investigated ceramic system consists of a gadolinium zirconate layer on top of a layer of yttria-stabilized zirconia prepared by atmospheric plasma spraying. The mechanical stability diagrams generated by the model delineate areas of safe operation from areas where mechanical damage of the thermal barrier coating becomes imminent. Intensive ceramographic inspection is used to investigate the defect growth kinetics in the ceramic top coat after isothermal exposure. Four-point bending experiments with in situ acoustic emission measurement are utilized to determine the critical strain to failure. The results are then used to generate mechanical stability diagrams for the thermal barrier coatings. From these diagrams, it becomes evident that the gadolinium zirconate layer has significantly lower strain tolerance than the yttria-stabilized zirconia. However, the underlying yttria-stabilized zirconia layer will provide some thermal protection even when the gadolinium zirconate layer has failed.

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7

Guoxian, Liang, Li Zhichao, and Wang Erde. "Thermal stability and mechanical properties of mechanically alloyed Al-10Ti alloy." Journal of Materials Science 31, no. 4 (February 1996): 901–4. http://dx.doi.org/10.1007/bf00352888.

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8

Lee, Kang Hyeon, Sang Won Myoung, Min Sik Kim, Seoung Soo Lee, Eun Hee Kim, Yeon Gil Jung, and Ung Yu Paik. "Thermal and Mechanical Characteristics of Thermal Barrier Coatings in Cyclic Thermal Fatigue Systems." Applied Mechanics and Materials 260-261 (December 2012): 438–42. http://dx.doi.org/10.4028/www.scientific.net/amm.260-261.438.

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In this study, the relationship between microstructural evolution and mechanical properties of thermal barrier coatings (TBCs) has been investigated through different thermal fatigue systems, electric thermal fatigue (ETF) and flame thermal fatigue (FTF), including the thermal stability through the interface between the bond and top coats. The TBC system with the thicknesses of 300 µm in both the top and bond coats was prepared with METCO 204 NS and AMDRY 962, respectively, with the air plasma spray (APS) system using 9MB gun. To observe the oxidation resistance and thermal stability of TBC, the thermal exposure tests were performed with both thermal fatigue tests at a surface temperature of 850 °C with a temperature difference of 200 °C between the surface and bottom of sample, for 12,000 EOH in designed apparatuses. The hardness values are slightly increased due to the densification of top coat with increasing the thermal exposure time in both thermal fatigue tests. The influence of thermal fatigue condition on the microstructural evolution and interfacial stability of TBC is discussed.

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9

Hailemariam, Henok, and Frank Wuttke. "Cyclic mechanical stability of thermal energy storage media." E3S Web of Conferences 205 (2020): 07008. http://dx.doi.org/10.1051/e3sconf/202020507008.

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Closing the gap between supply and demand of energy is one of the biggest challenges of our era. In this aspect, thermal energy storage via borehole thermal energy storage (BTES) and sensible heat storage systems has recently emerged as a practical and encouraging alternative in satisfying the energy requirements of household and industrial applications. The majority of these heat energy storage systems are designed as part of the foundation or sub-structure of buildings with load bearing capabilities, hence their mechanical stability should be carefully studied prior to the design and operation phases of the heat storage system. In this study, the cyclic mechanical performance of a commercial cement-based porous heat storage material is analyzed under different amplitudes of cyclic loading and medium temperatures using a recently developed cyclic thermo-mechanical triaxial device. The results show a significant dependence of the cyclic mechanical behavior of the material, such as in the form of cyclic axial and accumulated plastic strains, on the different thermo-mechanical loading schemes.

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10

Krag, Susanne, Carl Christian Danielsen, and Troels T. Andreassen. "Thermal and mechanical stability of the lens capsule." Current Eye Research 17, no. 5 (January 1998): 470–77. http://dx.doi.org/10.1076/ceyr.17.5.470.5198.

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11

Kamieniak, Joanna, Peter J. Kelly, Craig E. Banks, and Aidan M. Doyle. "Mechanical, pH and Thermal Stability of Mesoporous Hydroxyapatite." Journal of Inorganic and Organometallic Polymers and Materials 28, no. 1 (October 11, 2017): 84–91. http://dx.doi.org/10.1007/s10904-017-0652-3.

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12

Liu, Y. Y., M. C. Billone, and K. Taghavi. "Solid Breeder/Structure Mechanical Interaction and Thermal Stability." Fusion Technology 8, no. 1P2A (July 1985): 630–34. http://dx.doi.org/10.13182/fst85-a40110.

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13

Feng, J., B. Xiao, J. Chen, Y. Du, J. Yu, and R. Zhou. "Stability, thermal and mechanical properties of PtxAly compounds." Materials & Design 32, no. 6 (June 2011): 3231–39. http://dx.doi.org/10.1016/j.matdes.2011.02.043.

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14

Li, Mei, Xiang Yu Zhao, Wei Shao, Chuan Bao Ma, Rui Xue Zheng, and Ya Dong Chen. "Thermal Stability of an Epoxy Adhesive." Advanced Materials Research 1053 (October 2014): 257–62. http://dx.doi.org/10.4028/www.scientific.net/amr.1053.257.

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An epoxy adhesive and its curing agent are tested using differential scaning calorimetry under different atmospheres and after different exposure times to natural air to analyze its thermal properties. The results show that after the pure epoxy, the curing agent and the adhesive mixture of them are exposed in natural air for different period of time, all show different levels of decline in thermal stability and more complicated reactions when tested in the DSC and TGA in O2 and air, while the thermal properties remain stable when they are tested in an inert gas like N2. And according to the mechanical property tests and SEM results, the mechanical properties of the adhesive mixture in N2 are better than that in air. The results indicate that inert gas can protect the property of this kind of adhesive and thus increase its bond strength.

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15

Abid, A., R. Bensalem, and B. J. Sealy. "The thermal stability of AlN." Journal of Materials Science 21, no. 4 (April 1986): 1301–4. http://dx.doi.org/10.1007/bf00553267.

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16

Fang, WANG, SHENG Shen-Jun, GUO Ge-Pu, and MA Qing-Yu. "Thermal Stability and Dynamic Thermal Mechanical Properties of Microcellular Polylactic Acid Scaffolds." Acta Physico-Chimica Sinica 29, no. 12 (2013): 2505–12. http://dx.doi.org/10.3866/pku.whxb201310213.

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17

Su, Jun-Feng, Li-Xin Wang, Li Ren, and Zhen Huang. "Mechanical properties and thermal stability of double-shell thermal-energy-storage microcapsules." Journal of Applied Polymer Science 103, no. 2 (2006): 1295–302. http://dx.doi.org/10.1002/app.25252.

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18

Hasan, Gvlmira, Dilhumar Musajan, Gong-bo Hou, Mingyu He, Ying Li, and Mamatjan Yimit. "Role of different lignin systems in polymers: mechanical properties and thermal stability." Polish Journal of Chemical Technology 22, no. 4 (December 1, 2020): 10–16. http://dx.doi.org/10.2478/pjct-2020-0032.

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AbstractLignin was used to study the mechanical properties and thermal stability of polymers. The lignin was blended with three kinds of polymers, and the addition of lignin was 0.5 wt%. Under the condition of thermal oxidation, the thermal stability of lignin/polymer samples varies with the structure of lignin. The effects of lignin on the mechanical properties and thermal stability of the polymers were investigated by oxidation induction time (OIT), rheological properties, mechanical properties and differential scanning calorimetry (DSC). The results show that the effect of lignin on the thermal properties of polymer samples is 2~3°C. It can be inferred that lignin can effectively improve the interaction between polymer molecular chain segments, and improve the crystallization rate and rigidity to a certain extent, so it can be seen that lignin has good compatibility and thermal stability.

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19

Lin, Ken-Huang, Bo-Yuan Liao, Shin-Pon Ju, Jenn-Sen Lin, and Jin-Yuan Hsieh. "Mechanical properties and thermal stability of ultrathin molybdenum nanowires." RSC Advances 5, no. 39 (2015): 31231–37. http://dx.doi.org/10.1039/c5ra01359c.

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20

Solis, Daniel, Cristiano F. Woellner, Daiane D. Borges, and Douglas S. Galvao. "Mechanical and Thermal Stability of Graphyne and Graphdiyne Nanoscrolls." MRS Advances 2, no. 02 (2017): 129–34. http://dx.doi.org/10.1557/adv.2017.130.

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ABSTRACTGraphynes and graphdiynes are carbon 2D allotrope structures presenting both sp2and sp hybridized atoms. These materials have been theoretically predicted but due to intrinsic difficulties in their synthesis, only recently some of these structures have been experimentally realized. Graphyne nanoscrolls are structures obtained by rolling up graphyne sheets into papyrus-like structures. In this work, we have investigated, through fully atomistic reactive molecular dynamics simulations, the dynamics of nanoscroll formation for a series of graphyne (α, β, and δ types) structures. We have also investigated their thermal stability for a temperature range of 200-1000K. Our results show that stable nanoscrolls can be formed for all structures considered here. Their stability depends on a critical value of the ratio between length and height of the graphyne sheets. Our findings also show that these structures are structurally less stable then graphene-based nanoscrolls. This can be explained by the graphyne higher structural porosity which results in a decreased pi-pi stacking interactions.

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21

Krag, Susanne, Carl Christian Danielsen, and Troels T. Andreassen. "Thermal and mechanical stability of the lens capsule: ERRATUM." Current Eye Research 17, no. 7 (January 1998): 761. http://dx.doi.org/10.1080/02713689808951254.

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22

Li, W. X., M. Gao, Y. Song, and F. P. Wang. "Thermal stability and mechanical properties of zirconia–hydroxyapatite composites." Materials Research Innovations 18, sup4 (July 2014): S4–487—S4–489. http://dx.doi.org/10.1179/1432891714z.000000000725.

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23

Fadeeva, V. I., L. M. Kubalova, and I. A. Sviridov. "Structure and Thermal Stability of Co60Ge40Prepared by Mechanical Alloying." Inorganic Materials 40, no. 10 (October 2004): 1032–34. http://dx.doi.org/10.1023/b:inma.0000046463.69625.b1.

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24

Stoica, M., J. Eckert, S. Roth, A. R. Yavari, and L. Schultz. "Fe65.5Cr4Mo4Ga4P12C5B5.5 BMGs: Sample preparation, thermal stability and mechanical properties." Journal of Alloys and Compounds 434-435 (May 2007): 171–75. http://dx.doi.org/10.1016/j.jallcom.2006.08.188.

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25

Zhang, Kun, Yuehua Zhang, Depeng Yan, Chenyuan Zhang, and Shuangxi Nie. "Enzyme-assisted mechanical production of cellulose nanofibrils: thermal stability." Cellulose 25, no. 9 (July 5, 2018): 5049–61. http://dx.doi.org/10.1007/s10570-018-1928-7.

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26

Liu, K. W., and F. Mücklich. "Thermal stability of nano-RuAl produced by mechanical alloying." Acta Materialia 49, no. 3 (February 2001): 395–403. http://dx.doi.org/10.1016/s1359-6454(00)00340-2.

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27

Bouëssel du Bourg, Lila, Aurélie U. Ortiz, Anne Boutin, and François-Xavier Coudert. "Thermal and mechanical stability of zeolitic imidazolate frameworks polymorphs." APL Materials 2, no. 12 (December 2014): 124110. http://dx.doi.org/10.1063/1.4904818.

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28

Pi, Ji-Hee, Sung-Gyu Kwak, Sung-Yoon Kim, Go-Eun Lee, and Il-Ho Kim. "Thermal Stability and Mechanical Properties of Thermoelectric Tetrahedrite Cu12Sb4S13." Journal of Electronic Materials 48, no. 4 (December 19, 2018): 1991–97. http://dx.doi.org/10.1007/s11664-018-06883-z.

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29

Akhtar, D., R. D. K. Misra, and S. B. Bhaduri. "Thermal and mechanical stability of a Ni55Cr5Nb40 metallic glass." Acta Metallurgica 34, no. 7 (July 1986): 1307–14. http://dx.doi.org/10.1016/0001-6160(86)90017-9.

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30

Lin, Ken-Huang, Jia-Yun Li, Jenn-Sen Lin, Shin-Pon Ju, Jian-Ming Lu, and Jin-Yuan Hsieh. "Mechanical properties and thermal stability of ultrathin tungsten nanowires." RSC Advances 4, no. 14 (2014): 6985. http://dx.doi.org/10.1039/c3ra46215c.

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31

Braun, D., U. Brückner, P. Eckardt, and M. Hoffmockel. "Thermal stability and dynamic mechanical properties of acetal copolymers." Die Angewandte Makromolekulare Chemie 265, no. 1 (March 1, 1999): 55–61. http://dx.doi.org/10.1002/(sici)1522-9505(19990301)265:1<55::aid-apmc55>3.0.co;2-9.

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32

Lyakhov, N. Z., T. F. Grigoryeva, and A. P. Barinova. "Thermal stability of solid solutions obtained by mechanical alloying." Journal of Thermal Analysis and Calorimetry 82, no. 3 (November 2005): 741–46. http://dx.doi.org/10.1007/s10973-005-0958-1.

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33

Xiao, Jun, and D. D. L. Chung. "Thermal and Mechanical stability of electrically conductive adhesive joints." Journal of Electronic Materials 34, no. 5 (May 2005): 625–29. http://dx.doi.org/10.1007/s11664-005-0075-8.

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34

Moelle, C. H., and H. J. Fecht. "Thermal stability of nanocrystalline iron prepared by mechanical attrition." Nanostructured Materials 6, no. 1-4 (January 1995): 421–24. http://dx.doi.org/10.1016/0965-9773(95)00086-0.

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35

Darling, Kris A., R. K. Guduru, C. Lewis Reynolds, Vikram M. Bhosle, Ryan N. Chan, Ronald O. Scattergood, Carl C. Koch, J. Narayan, and M. O. Aboelfotoh. "Thermal stability, mechanical and electrical properties of nanocrystalline Cu3Ge." Intermetallics 16, no. 3 (March 2008): 378–83. http://dx.doi.org/10.1016/j.intermet.2007.11.005.

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36

Murashkina, Yuliya, and Dmitry Lipchansky. "Epoxy Composites Filled with Sodium Bicarbonate: Thermal and Mechanical Properties." Key Engineering Materials 781 (September 2018): 159–64. http://dx.doi.org/10.4028/www.scientific.net/kem.781.159.

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The epoxy composites filled with 5 and 10 mass % of sodium bicarbonate were prepared. Sodium bicarbonate at the heating decomposes into sodium carbonate, carbon dioxide and water. As a result, sodium bicarbonate is able to slow down the combustion process when it used as polymer filler. The thermal stability of the prepared samples was investigated at the heating in air using thermal analysis. The mechanical characteristics of epoxy composites were also studied. The gaseous products of thermal oxidative degradation were studied using mass spectrometric analysis. It was found that sodium bicarbonate accelerates the process of thermal oxidative degradation of the epoxy composites in the initial stage, but enhances thermal stability in the final stage. The addition of boric acid to sodium bicarbonate as filler is recommended to improve the thermal stability of the epoxy polymer.

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37

Sahebian, S., and MT Hamed Mosavian. "Thermal stability of CaCO3/polyethylene (PE) nanocomposites." Polymers and Polymer Composites 27, no. 7 (May 14, 2019): 371–82. http://dx.doi.org/10.1177/0967391119845994.

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Calcium carbonate (CaCO3) nanoparticles in polymer matrix cause to improvement in polymer performance, including thermal stability and mechanical properties. The main goal of this article is to investigate the effect of different weight percentage of nanoparticles of CaCO3 on thermal stability and mechanical properties of polyethylene (PE) nanocomposites. The morphological structure of CaCO3 nanoparticles and nanocomposites was investigated by transmission electron microscopy and scanning electron microscopy. The thermal stability of PE and its nanocomposites was also determined by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and thermomechanical analysis. Nonisothermal crystallization experiments by DSC test showed that the incorporation of nanoparticles increased the crystallinity, glass transition temperature, and the effective energy barrier for crystallization process. Besides, degradation behavior was evaluated by TGA. The onset mass loss temperature shifted to higher value in the presence of nanoparticles.

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38

Kleiman, Sagiv, and Rachman Chaim. "Thermal stability of MgO nanoparticles." Materials Letters 61, no. 23-24 (September 2007): 4489–91. http://dx.doi.org/10.1016/j.matlet.2007.02.032.

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39

Renjanadevi, B., and K. E. George. "Modification of Polystyrene using Nanosilica for Improvement in Mechanical Properties." Progress in Rubber, Plastics and Recycling Technology 25, no. 2 (May 2009): 103–11. http://dx.doi.org/10.1177/147776060902500202.

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Modification of polymers using nanoparticles brings significant improvement in many properties. This study has been carried out to find the effect of nanosilica on the mechanical and thermal properties of polystyrene (PS). Nanosilica was prepared by acid hydrolysis method and it was melt mixed with polystyrene in a torque rheometer. The mechanical and thermal properties of the composite were evaluated in comparison to pure PS. Mechanical properties were evaluated by conducting tensile and impact tests. Thermal stability was evaluated by TGA. Both mechanical properties and thermal stability are found to improve with increase in silica loadings up to 3 wt.%.

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40

Chiu, Shih-Hsuan, Sigit Tri Wicaksono, Kun-Ting Chen, Chiu-Yen Chen, and Sheng-Hong Pong. "Mechanical and thermal properties of photopolymer/CB (carbon black) nanocomposite for rapid prototyping." Rapid Prototyping Journal 21, no. 3 (April 20, 2015): 262–69. http://dx.doi.org/10.1108/rpj-11-2011-0124.

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Purpose – The purpose of this paper is to evaluate the mechanical properties of photopolymer/CB (carbon black) nanocomposite when applied in a visible-light rapid prototyping (RP) machine. Design/methodology/approach – The mechanical properties of the samples such as hardness and tensile strength along with thermal stability were analyzed. The curing time behavior of the photopolymer/CB nanocomposites was tested by using a rigid-body pendulum rheometer. The shrinkage property and dimensional stability were also analyzed using the technique according to ASTM D2566 and ASTM D1204, respectively. Findings – The results showed that the prototype fabricated from pristine photopolymer tended to exhibit poor mechanical properties and low thermal stability. However, after adding the photopolymer with various concentrations of nano-CB and dispersant in appropriate composition, the photopolymer/CB nanocomposite prototype not only reduced its curing time but also enhanced its mechanical properties, thermal stability and dimensional stability. Practical implications – The presented results can be used in a visible-light RP machine. Originality/value – The mechanical and thermal properties of photopolymer are improved with nano-CB additives for a RP system.

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41

Andrievski, R. A. "Review of thermal stability of nanomaterials." Journal of Materials Science 49, no. 4 (November 5, 2013): 1449–60. http://dx.doi.org/10.1007/s10853-013-7836-1.

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42

Volkov Husović, T. "Thermal Stability Testing of Refractory Specimen." Journal of Testing and Evaluation 34, no. 6 (2006): 100047. http://dx.doi.org/10.1520/jte100047.

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43

Yang, Po-Yu, Shin-Pon Ju, Zhu-Min Lai, Jin-Yuan Hsieh, and Jenn-Sen Lin. "The mechanical properties and thermal stability of ultrathin germanium nanowires." RSC Advances 6, no. 107 (2016): 105713–22. http://dx.doi.org/10.1039/c6ra21841e.

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44

Hagiwara, T., M. Yamaura, and K. Iwata. "Thermal stability of polyaniline." Synthetic Metals 25, no. 3 (September 1988): 243–52. http://dx.doi.org/10.1016/0379-6779(88)90249-4.

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45

Kulkarni, Vaman G., Larry D. Campbell, and William R. Mathew. "Thermal stability of polyaniline." Synthetic Metals 30, no. 3 (June 1989): 321–25. http://dx.doi.org/10.1016/0379-6779(89)90654-1.

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46

Pan, Li Sha, Nai Xu, Zheng Tian, Ling Bin Lu, Su Juan Pang, and Qiang Lin. "Preparation and Characterization of Poly(propylene carbonate)/Alkali Lignin Composite Sheets by Calendering Process." Advanced Materials Research 233-235 (May 2011): 1786–89. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.1786.

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PPC is a new biodegradable aliphatic polycarbonate with poor thermal stability and mechanical properties which is difficult to form sheets or films and so on. Through the addition of alkali lignin, thermal stability and mechanical properties of PPC was improved largely. PPC/ alkali lignin sheets could be prepared. DSC results showed that the thermal stability of PPC was improved by the introduction of alkali lignin. SEM showed good dispersion of alkali lignin particles into PPC matrix that resulted in good miscibility. Improved mechanical properties and thermal stability of PPC/ alkali lignin blends were attributed to stronger interfacial interaction of PPC and alkali lignin. These results indicate that blending PPC with alkali lignin is an efficient and convenient method to improve the properties of PPC.

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47

Mohan, Ramesh, and Panneerselvam Kavan. "Influence of polybenzimidazole nanoparticle on the thermo-mechanical characteristics of high density polyethylene composite." Physica Scripta 97, no. 3 (February 25, 2022): 035706. http://dx.doi.org/10.1088/1402-4896/ac55be.

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Abstract This present research focuses on the mechanical, thermal, flammability and thermo-mechanical behavior of varying percentages of high performance polymer polybenzimidazole (PBI) nanoparticle reinforced high density polyethylene (HDPE) composite. The principal aim of this present study was to investigate how the addition of polybenzimidazole nanoparticle influences the mechanical, thermal, flammability and thermo-mechanical behavior of high density polyethylene thermoplastic composite. The composites of polyethylene and polybenzimidazole were prepared by a melt intercalation process with different weight proportions as 1, 3 and 5 wt% using a twin-screw extruder. The prepared composites were characterized for their properties in-accordance to ASTM standards. The mechanical properties revealed significant improvements for PBI addition. The Scanning Electron Microscope (SEM) fractograph revealed moderate waviness and improved toughness. Similarly, the results of Thermo gravimetric analysis (TGA) and Differential Scanning Calorimetry (DSC) showed an increase in Tg and mass loss stability for 5 wt% of PBI. The Flammability and Dynamic mechanical analysis (DMA) results showed an increased flame resistance, damping and loss modulus for high concentration of PBI nanoparticle. These mechanically, thermally and thermo-mechanically toughened HDPE thermoplastic composites could be used in engineering, space, wearable material and defence applications where high toughness, high thermal stability structural materials are required.

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48

Ghosh, Prakriti Kumar, Manjeet Singh Goyat, Deepak Mishra, and Rishabh Nagori. "Physical and Mechanical Properties of Epoxy-Nanoparticulate Composite Adhesive." Advanced Materials Research 585 (November 2012): 297–300. http://dx.doi.org/10.4028/www.scientific.net/amr.585.297.

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The effect of type of nanoparticles on morphology, thermal and mechanical properties of epoxy-nanoparticulate composite adhesive produced via ultrasonic vibration process has been investigated. The morphology, thermal and mechanical properties of epoxy-nanoparticulate composite adhesive was measured with FESEM/AFM, DTA/TGA, and Hounsfield respectively. The FESEM/AFM images of the epoxy-nanoparticulate composite adhesive reveals significantly fine dispersion of nanoparticles. The incorporation TiO2 nanoparticles in epoxy adhesive results in improved glass transition temperature (Tg), thermal stability and tensile properties of the nanocomposite. But, the incorporation of comparatively finer size Al2O3 nanoparticles leads to decrease in the Tg, thermal stability and tensile properties of the nanocomposite.

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Ritasalo, Riina, Ulla Kanerva, and Simo Pekka Hannula. "Thermal Stability of PECS-Compacted Cu-Composites." Key Engineering Materials 527 (November 2012): 113–18. http://dx.doi.org/10.4028/www.scientific.net/kem.527.113.

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In this paper pulsed electric current sintering (PECS) is applied for submicron-sized copper (sm-Cu) based composite-powders aiming to produce MMC’s with higher strength and better temperature stability than reference sm-Cu. Incorporation of cuprite (Cu2O), alumina (Al2O3), titaniumdiboride (TiB2) and nano- and submicronsized diamonds (ND’s and SMD’s) improved noticeably the room temperature mechanical properties and the high-temperature stability of copper the effects becoming more noticeable with smaller dispersion size and higher amount of reinforcement. The hardness increment was at highest, when using ND’s or Al2O3. E.g., the microhardness for the reference sm-Cu sample and Cu with 3 vol.% ND’s, 6 vol.% ND’s and 2.5 vol.% Al2O3 were 1.02, 1.43, 1.77 and 1.58 GPa, respectively. Similar trend was noted also in the case of thermal stability and CTE. The study shows that Cu-ND, Cu-SMD and Cu-Cu2O are suitable for use at moderate temperatures around 623 - 673 K, whereas Cu-Al2O3 and Cu-TiB2 are suitable above 1023 K. In conclusion, PECS is suitable method to produce high quality Cu-composites having superior thermal and mechanical properties compared to those of sm-Cu.

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Xia, Ao, and Robert Franz. "Thermal Stability of MoNbTaVW High Entropy Alloy Thin Films." Coatings 10, no. 10 (September 30, 2020): 941. http://dx.doi.org/10.3390/coatings10100941.

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Refractory high entropy alloys are an interesting material class because of their high thermal stability, decent electrical conductivity, and promising mechanical properties at elevated temperature. In the present work, we report on the thermal stability of body-centered cubic MoNbTaVW solid solution thin films that were synthesized by cathodic arc deposition. After vacuum annealing up to 1600 °C, the morphology, chemical composition, crystal structure, and electrical conductivity, as well as the mechanical properties, were analyzed. The observed body-centered cubic MoNbTaVW solid solution phase is stable up to 1500 °C. The evolution of electrical and mechanical properties due to the annealing treatment is discussed based on the observed structural changes of the synthesized thin films.

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