Academic literature on the topic 'Thermo-sensitive materials'

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Journal articles on the topic "Thermo-sensitive materials"

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Wang, Bin, Zhi Neng Ye, Liu Quan Ji, and Nian Xi Hu. "Thermo-Sensitive Materials for the Time-Temperature Indicator." Advanced Materials Research 284-286 (July 2011): 2442–45. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.2442.

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[Purpose] To show storage-resistant food internal quality changes such as canned food. [Method] By measuring the time-temperature-gray relational model of thermo-sensitive paper, compare it with the time-temperature-quality movement model of storage-resistant food. [Results] The analysis of the example show that: through controlling the production process and prescription of thermo-sensitive paper, adjusting the dosage of color-producing reagent, enabling the variation rule of gray match with the quality change of storage-resistant food. [Conclusions] Based colorless dyestuff 2-phenyl-3-methyl-6, 6-2 D-amino fluoran and 2, 2-bis (4-hydroxyphenyl) propane color developer thermo-sensitive system, through controlling the production process and prescription of thermo-sensitive paper to show the quality change of storage-resistant food.
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Kato, K., T. Sato, K. Murakami, M. Aoyama, and R. Ito. "125. Interstitial Hyperthermia using Thermo-sensitive Ferromagnetic Materials." Japanese Journal of Radiological Technology 49, no. 2 (1993): 245. http://dx.doi.org/10.6009/jjrt.kj00003501170.

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Zhang, Mei, Tian Yu Xu, Yan Cui, and Da Hui Sun. "Study on Preparation and Sensitive Properties of Polyethylene Glycol (PEG) / Polyvinyl Alcohol (PVA) Thermo-Sensitive Hydrogel." Advanced Materials Research 306-307 (August 2011): 41–45. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.41.

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Thermo-sensitive hydrogel have broad application prospects in biochemistry, medicine and other fields. In this paper, PEG as low melting point polymer was grafted at PVA which was as polymer framework of high melting point by copolymerization, a serials of new reversible phase-change materials were obtained and thermo-sensitive hydrogel were prepared because of their swelling properties. The hydrogel swelling behavior was analyzed, thermo-sensitive properties analysis was made by using DSC method, xerogel phase transition behavior was also studied and through which the relationship between PEG phase transition temperature and thermo-sensitive behaviors of the hydrogel was studied. The results showed that the thermo-sensitive hydrogel phase transition temperature was in the range of 36.3~43°C,and the phase transition temperature and the temperature sensitivity existed a certain relationship.
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Wang, Sheng, Songqi Ma, Lijun Cao, Qiong Li, Qing Ji, Juncheng Huang, Na Lu, Xiwei Xu, Yanlin Liu, and Jin Zhu. "Conductive vitrimer nanocomposites enable advanced and recyclable thermo-sensitive materials." Journal of Materials Chemistry C 8, no. 34 (2020): 11681–86. http://dx.doi.org/10.1039/d0tc02821e.

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Ding, Tao, and Jeremy J. Baumberg. "Thermo-responsive plasmonic systems: old materials with new applications." Nanoscale Advances 2, no. 4 (2020): 1410–16. http://dx.doi.org/10.1039/c9na00800d.

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Ju, Ben Zhi, Shu Fen Zhang, and Dong Mao Yan. "Dual Thermo- and pH-Responsive Materials Based on Starch." Advanced Materials Research 679 (April 2013): 15–21. http://dx.doi.org/10.4028/www.scientific.net/amr.679.15.

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A simple and direct method for preparation of thermo- and pH- responsive materials based on starch is presented. Introduction of 2-hydroxy-3-butoxypropyl as hydrophobic group into starch developed thermo-responsive material, and further introduction of hydrophilic carboxymethyl group could produce dual thermo- and pH-responsive materials. The LCST of these starch-based materials can be easily adjusted at desired temperature between 4.5 and 57.0°C by controlling the molar substitution of 2-hydroxy-3-butoxypropyl and carboxymethyl groups. Furthermore, the LCST of 2-hydroxy-3-butoxypropyl-carboxymethyl starch was also highly sensitive to pH.
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Tang, Xin De, Fa Qi Yu, Ye Chen, and Mei Shan Pei. "Thermo-Sensitive Nanogated System Based on Polymer-Modified Mesoporous Silica Hybrid Nanoparticles." Key Engineering Materials 538 (January 2013): 93–96. http://dx.doi.org/10.4028/www.scientific.net/kem.538.93.

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Mesoporous silica nanoparticles (MSNs) have been employed as a versatile solid support for constructing a variety of hybrid materials for controlled drug delivery. Controlled release systems that integrate external stimuli with nanocarriers have attracted much attention for sensors and drug delivery applications. Mesoporous silica nanoparticles grafted with thermo-sensitive polymers on the surface were fabricated via “grafting to” approach through chemical coupling reaction. The encapsulation and release of drug based on the thermo-sensitive nanogated system were investigated. The thermo-sensitive nanogated system can be expected as one of the promising candidates for drug delivery and controlled release.
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Sahoo, Sanjeeb Kumar, Tapas K. De, P. K. Ghosh, and Amarnath Maitra. "pH- and Thermo-sensitive Hydrogel Nanoparticles." Journal of Colloid and Interface Science 206, no. 2 (October 1998): 361–68. http://dx.doi.org/10.1006/jcis.1998.5692.

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Yu, Yibin, Yi Cheng, Junye Tong, Lei Zhang, Yen Wei, and Mei Tian. "Recent advances in thermo-sensitive hydrogels for drug delivery." Journal of Materials Chemistry B 9, no. 13 (2021): 2979–92. http://dx.doi.org/10.1039/d0tb02877k.

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Thermo-sensitive hydrogels based on different polymers have been broadly used in the pharmaceutical fields. In this review, the state-of-the-art thermo-sensitive hydrogels for drug delivery are elaborated
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Xiao, X. C., L. Y. Chu, W. M. Chen, S. Wang, and Y. Li. "Positively Thermo-Sensitive Monodisperse Core–Shell Microspheres." Advanced Functional Materials 13, no. 11 (November 4, 2003): 847–52. http://dx.doi.org/10.1002/adfm.200304513.

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Dissertations / Theses on the topic "Thermo-sensitive materials"

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PIRANI, FEDERICA. "Bio-oriented Micro- and Nano- Structures Based on Stimuli-responsive Polymers." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2706874.

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Nowadays, the ability to pattern surfaces on the micro- and nano- scale is the basis for a wide range of research fields. Over last few decades, a lot of processing technologies offer the possibility to fabricate complex 2D and 3D polymeric designs which are mostly static in nature since they cannot be physically and chemically modified once fabricated. The aim of the present thesis is to overcome such a limitation, exploiting stimuli-responsive materials (Chapter I). We allow to engineer polymeric architectures adding interesting functionalities, by providing an active manipulation of pre-structured systems, which could be helpfully in a wide variety of applications, such as biosensing and cell conditioning. In the first part of the present dissertation (Chapter II), a thermos-sensitive material is employed. We investigate the thermo-responsive behavior of Poly(N-isopropylacrylamide) (pNIPAAm)-based crosslinkable hydrogel as active binding matrix in optical biosensors. In this study, we propose an extension of surface plasmon resonance (SPR) and optical waveguide mode (OWS) spectroscopy, for in situ observation of nano-patterned hydrogel film that are allowed to swell and collapse by varying the external temperature of the aqueous environment. Weak refractive index contrast of hydrogel structures arranged in periodic pattern, is generally associated with intrinsically low diffraction efficiency. In order to enhance the intensity of diffracted light, the surface is probed by resonantly excited optical waveguide modes, taking advantage of the fact that the hydrogel can serve as optical waveguide (HOW) enabling the excitation of additional modes besides surface plasmons. Thus, we provide a hydrogel optical waveguide-enhanced diffraction measurements, taking advantage of strong electromagnetic field intensity enhancements that amplifies the weak diffracted light intensity. The main part of the thesis is focused in the study of azopolymer-containing materials, a specific class of light-responsive materials. Upon photon absorption, azobenzene undergo reversible trans-cis photoisomerization, which induces a substantial geometrical change of its molecular structure, that can be translated into larger-scale movements of the material below the glass transition temperature (Tg) of the polymer. In Chapter III, by exploiting the light-induced mass migration phenomenon, we demonstrate that an azopolymeric film patterned by soft imprinting technique, can be anisotropically deformed and consequent restored in its initial shape via single irradiation just by controlling the polarization state of the incident laser beam. We also propose that the light-driven morphological manipulation can induce anisotropic wettability changes. Lastly, a polarization driven birefringence effect on flat and structured surfaces is discussed. Chapter IV focuses in the design of novel azopolymeric systems, where the optical response is provided by azobenzene molecules, which doped two different host materials. The photo-responsive behavior and potential applications of azo compounds incorporated into either a soft elastomeric and in rigid matrix is discussed. Azo-embedded poly(dimethylsiloxane) (PDMS) is studied as tunable optical lens and an azo-doped photocurable commercial polymeric resin is developed to study the photo-mechanical transduction of a 3D suspended membrane fabricated by two photon lithography technique. In Chapter V, we propose a light-deformable azopolymeric micro-pillars patterned substrate as a biocompatible and “smart” platform for dynamic material-cell observation in 2D environment, modified by a holographic optical conditioning. The aim is to observe by time-lapse acquisitions, how an in situ deformation of a pre-patterned structure can influence cell functions and fate. Finally, in Chapter VI, general remarks of the present work are discussed, and directions for future perspective are summarized.
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Book chapters on the topic "Thermo-sensitive materials"

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Kobayashi, Shiro, Soo-Ik Oh, and Taylan Altan. "Thermo-Viscoplastic Analysis." In Metal Forming and the Finite-Element Method. Oxford University Press, 1989. http://dx.doi.org/10.1093/oso/9780195044027.003.0015.

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The main concern here is the analysis of plastic deformation processes in the warm and hot forming regimes. When deformation takes place at high temperatures, material properties can vary considerably with temperature. Heat is generated during a metal-forming process, and if dies are at a considerably lower temperature than the workpiece, the heat loss by conduction to the dies and by radiation and convection to the environment can result in severe temperature gradients within the workpiece. Thus, the consideration of temperature effects in the analysis of metal-forming problems is very important. Furthermore, at elevated temperatures, plastic deformation can induce phase transformations and alterations in grain structures that, in turn, can modify the flow stress of the workpiece material as well as other mechanical properties. Since materials at elevated temperatures are usually rate-sensitive, a complete analysis of hot forming requires two considerations—the effect of the rate-sensitivity of materials and the coupling of the metal flow and heat transfer analyses. A material behavior that exhibits rate sensitivity is called viscoplastic. A theory that deals with viscoplasticity was described in Chap. 4. It was shown that the governing equations for deformation of viscoplastic materials are formally identical to those of plastic materials, except that the effective stress is a function of strain, strain-rate, and temperature. The application of the finite-element method to the analysis of metal-forming processes using rigid-plastic materials leads to a simple extension of the method to rigid-viscoplastic materials. The importance of temperature calculations during a metal-forming process has been recognized for a long time. Until recently, the majority of the work had been based on procedures that uncouple the problem of heat transfer from the metal deformation problem. Several researchers have used the following approach. They determined the flow velocity fields in the problem either experimentally or by calculations, and they then used these fields to calculate heat generation. Examples of this approach are the works of Johnson and Kudo on extrusion, and of Tay et al. on machining. Another approach uses Bishop’s numerical method in which heat generation and transportation are considered to occur instantaneously for each time-step with conduction taking place during the time-step.
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Koshevoi, Veniamin, Anton Belorus, Ilya Pleshanov, Anton Timchenko, Roman Denisenko, Daniyar Sherimov, and Ekaterina Vodkailo. "Study of Composite Structures Based on a Porous Silicon Matrix and Nanoparticles Ag/Zno Used as Non-Invasive Highly Sensitive Biosensor Devices." In Composite Materials. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.92850.

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In this work composite structures based on a porous silicon were obtained and studied. Porous matrices were formed by electrochemical etching in aqueous solutions of hydrofluoric acid. Based on the obtained substrates, por-silicon (Si)/silver (Ag) and por-Si/zinc oxide (ZnO) composite structures were formed. These composites were functionalized by various methods (electro (E)-, thermo (T)-, electrothermal exposure) as a result of which the structures were modified. When studying the samples by scanning electron microscopy (SEM), it was concluded that silver nanoparticles actively diffused into the pores under these technological modes of functionalization. The por-Si/Ag and por-Si/ZnO composite structures were also studied using the following methods: infrared (IR) spectroscopy and Raman ultrasoft X-ray emission spectroscopy. Also, the photoluminescent characteristics of the samples were studied. Based on the obtained results, it was concluded that functionalization methods actively change the phase composition of structures and the optical properties of composites.
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Conference papers on the topic "Thermo-sensitive materials"

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Feng, X., L. Chen, L. L. Ju, and Y. P. Zhao. "PNIPAm/PVA thermo-sensitive fibers." In International Conference on Smart Materials and Nanotechnology in Engineering. SPIE, 2007. http://dx.doi.org/10.1117/12.779600.

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Tang, Xiao-Liang, Shao-Meng Guo, Zi-Dian Liu, Ren-Zhi Tang, Jia-Yu Pang, and Yang Chen. "Preparation of thermo-sensitive poly(N-isopropylacrylamide) film using KHz alternating current Dielectric barrier discharge." In 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/ifeesm-17.2018.113.

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Wang, B., J. P. Yu, Z. N. Ye, L. L. Luo, F. Y. Zheng, and J. W. Jiang. "Research on Time-Temperature-Integrators of Meal-Ready-to-Eat Military Food Made by Thermo-sensitive Dyeing." In 2015 International Conference on Advanced Engineering Materials and Technology. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icaemt-15.2015.2.

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Furushima, Tsuyoshi. "Finite Element Modeling of Dieless Tube Drawing of Strain Rate Sensitive Material with Coupled Thermo-Mechanical Analysis." In MATERIALS PROCESSING AND DESIGN: Modeling, Simulation and Applications - NUMIFORM 2004 - Proceedings of the 8th International Conference on Numerical Methods in Industrial Forming Processes. AIP, 2004. http://dx.doi.org/10.1063/1.1766578.

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Nikitin, Y. A., I. G. Chernysh, and V. V. Zaporozhets. "Using Nanotribotesting for the Creation of Modified Exfoliated Graphite-Based Materials." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44116.

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Methodical approach an evaluation of synthesis of alumosilicates on the surface of EG-particles in order to improve the thermooxidazing resistance of the graphite. Using perspective trends in formation of exfoliated graphite (EG)-based lightweight composition materials by synthesis of non-organic combinations on the surface of EG-particles, it was proved the possibility of purposeful change of properties both of EG-powder surface and modified EG-based moulded materials. Using the nanotribospectral test method, we have developed approaches to the study thermo-oxide and product manufacturing processes of the modified EG-based lightweight materials. It has been found that the parameters of the nanotribospectral test method are sensitive to the structural reorganisation processes that proceed in the bulk of the material and may be used for the optimisation product process and high estimation and monitoring of its quality.
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Zhao, Yang, Rong-Shiuan Chu, and Arun Majumdar. "Transient Thermo-Reflectance Method for Characterization of Thermal Interface Material Based on Carbon Nanotube Array." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18306.

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Vertically aligned carbon nanotube (CNT) arrays have been explored as advanced thermal interface materials because of their compliance and high cross-plane thermal conductivity. Our previous work showed that a CNT array directly bridging two surfaces by dry contact had a surface-surface interface resistance of order of 10 m2-K/MW. With an indium bonding layer, the interface thermal resistance was reduced by a factor of ten. Therefore, a more sensitive measuring system is needed to accurately determine the thermal resistance. In this paper, we achieved a higher sensitivity measurement by applying the phase sensitive transient thermo-reflectance technique to a front side heating and detecting system. A detailed analysis is presented. We used this technique to characterize a 71-μm long CNT array with packing density of 9.4 ± 1.4%. The CNT array was sequentially wetted with chromium/gold films and was bonded to a glass surface with an indium bonding layer. We found that the CNT array-surface interface resistance is 0.35 ± 0.11 m2-K/MW and the cross-plane thermal conductivity of CNT array is 94 ± 40 W/m-K.
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Tong, Tao, Yang Zhao, Lance Delzeit, Ali Kashani, Arun Majumdar, and M. Meyyappan. "Vertically Aligned Multi-Walled Carbon Nanotube Arrays as Thermal Interface Materials and Measurement Technique." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81926.

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State-of-the-art thermal interface materials are briefly reviewed with an emphasis on the emerging trend of using carbon nanotubes to increase interface thermal performance. Vertically aligned multi-walled carbon nanotube (MWCNT) arrays were grown and applied as thermal interfacial enhancing materials. It is expected that the highly thermally conductive channels directly bridging the mating surfaces would significantly enhance the interface thermal conductance. We extended the all-optical pump and probe phase sensitive transient thermo-reflectance (PSTTR) method and used it to measure the interfacial properties of a three-layer sample of a vertically aligned MWCNT array grown on silicon (Si) substrate dry adhered to a glass plate. The dominant thermal resistance is identified as the dry adhered MWCNT-glass interface with a thermal conductance of ~5.9 × 104 W/m2·K, compared with MWCNT-Si interface of almost two orders of magnitude higher. Tentative explanations on the difference in the two interfaces and ways for future improvements are provided. The PSTTR measurement principle and issues are also discussed in the context.
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Kuo, Chia-Tai, Ming-Chuen Yip, and Kuo-Ning Chiang. "Characterization of Time and Temperature Dependent Mechanical Behavior of Underfill Materials in Electronic Packaging Application." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35232.

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The thermo-mechanical testing of HYSOL FP4549 polymer-filled underfill material was conducted under different strain rate and temperature environment. A new specimen preparation procedure and further test methodology are developed to characterize the underfill time-temperature mechanical behaviors. The stress-strain behavior of materials is simulated with constitutive framework, and the dependence of Young’s modulus on temperature and strain rate was evaluated. In addition, the specimens were tested with micro-tensile system to evaluate the underfill materials creep curve as a function of temperature and stress level. In view of the uncertainty of the Young’s modules determination, the specimens were tested with unloading-reloading technique to verify the test results and investigate its cyclic mechanical behaviors. On the other hand, the adhesion strength are tested between different adhesion surface by different deformation rate after some isothermal and hygro-thermal environments attack, which is to simulate the environment that the electronic components may be encountered. The results reveal that the rise of the temperature and moisture cause the apparent reduction of the surface adhesion strength, due to the material microstructure transition and the diffusion and concentration of moisture. For all conditions of the experiment after environmental preconditioning, the specimen fracture surfaces occur between solder mask and FR4 substrates, which means the measured strength is the adhesion strength between solder mask and FR4. Comparing different adhesion surface, the adhesion strength of underfill/FR4 is higher than solder mask/FR4. In addition, it has found that the fracture strain and the slope of the load-deformation diagram increases with the decreasing deformation rate. The interface of solder mask/FR4 is more sensitive to the temperature and moisture.
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Kweon, Soondo, and Ahmed Amine Benzerga. "Strain Localization in Determining the Constitutive Response of Polymers." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65147.

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The constitutive response of glassy polymers is characterized by their complex thermo-mechanical behavior such as strain rate and temperature sensitive yielding, softening at small strains and re-hardening at large strains. These complex behaviors trigger strain localization in the deformation of polymers. Since localization can be induced by both structural and material instabilities, careful analysis needs to be performed to investigate the localization behavior of polymer specimen testing. Localization such as neck formation and propagation that typically occurs in the tensile and compressive testing of polymers and plastics makes it difficult for experimentalists to extract their intrinsic constitutive response. This problem is exacerbated when localization occurs with shear bands. In this study, a macromolecular constitutive model for polymers showing small-strain softening and large-strain directional hardening is employed to investigate the effect of localization in tension onto the constitutive identification process. Considering the complex interplay between the structural and constitutive instabilities, a method based on direct, real-time measurement of area reduction at the neck section has been proposed to extract the intrinsic constitutive response of polymer materials.
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Werschmoeller, Dirk, and Xiaochun Li. "Measurement of Tool Internal Temperatures in the Tool-Chip Contact Region by Embedded Thin Film Micro Thermocouples." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34176.

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Monitoring and controlling thermomechanical parameters in tooling materials are imperative for improving the fundamental understanding, reliability and workpiece quality of material removal processes. Polycrystalline boron nitride (PCBN) tools are being used heavily in hard machining/turning. These processes are very sensitive to variation in local machining conditions at tool-workpiece interface and lack a thorough understanding of fundamental thermo-mechanical phenomena, both often leading to abrupt tool failures. Existing sensors to monitor the machining conditions are not suitable for robust process control as they are either destructively embedded and/or don’t possess the necessary spatial and temporal resolution to monitor temperature during machining at the cutting tip/edge effectively. This paper presents an emerging approach for assessing dynamic temperatures in the close vicinity of the tool cutting edge. An array of 10 micro thin film micro thermocouples, fabricated using adapted semiconductor microfabrication methods, has been embedded into PCBN using a modified diffusion bonding technique. Scanning electron microscopy was performed to examine material interactions at the bonding interface and determine optimal bonding parameters. The sensors’ performance is statically and dynamically characterized. They show good linearity, sensitivity and very fast response time.
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