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Effects of Processing on Properties of Advanced Ceramics最新文献

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Characterization of Ceramic Components Exposed in Industrial Gas Turbines 工业燃气轮机中暴露陶瓷部件的特性
Effects of Processing on Properties of Advanced Ceramics Pub Date : 2001-11-11 DOI: 10.1002/9781118405970.CH16
M. Ferber, H. T. Lin
{"title":"Characterization of Ceramic Components Exposed in Industrial Gas Turbines","authors":"M. Ferber, H. T. Lin","doi":"10.1002/9781118405970.CH16","DOIUrl":"https://doi.org/10.1002/9781118405970.CH16","url":null,"abstract":"\u0000 This paper provides a review of recent studies undertaken to examine the mechanical and thermal stability of silicon nitride ceramic components that are currently being considered for use in gas turbine applications. Specific components examined included a bowed ceramic nozzle evaluated in an engine test stand, ceramic vanes exposed in two field tests, and an air-cooled vane that is currently under development. Scanning electron microscopy was used to elucidate the changes in the microstructures arising from the environmental effects. The recession of the airfoils resulting from the volatilization of the normally protective silica layer was also measured. The stability of the intergranular phases was evaluated using x-ray diffraction. The surface strength was measured using a miniature biaxial test specimen, which was prepared by diamond core drilling.","PeriodicalId":141352,"journal":{"name":"Effects of Processing on Properties of Advanced Ceramics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121820105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Combustion Chemical Vapor Deposition of YSZ Thin Films for Fuel Cell Applications YSZ薄膜在燃料电池中的燃烧化学气相沉积研究
Effects of Processing on Properties of Advanced Ceramics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/md-24800
Zhigang Xu, J. Sankar, Q. Wei
{"title":"Combustion Chemical Vapor Deposition of YSZ Thin Films for Fuel Cell Applications","authors":"Zhigang Xu, J. Sankar, Q. Wei","doi":"10.1115/imece2001/md-24800","DOIUrl":"https://doi.org/10.1115/imece2001/md-24800","url":null,"abstract":"\u0000 Chemical vapor deposition (CVD) is well recognized as the most effective technique to prepare high-quality thin solid films. This technique can be classified into two categories according to the working pressure, i.e. low to very low pressure and high pressure CVD. In this paper, the high pressure CVD technique is interested to the authors. An atmospheric combustion chemical vapor deposition (ACCVD) system has been developed for yttria fully stabilized zirconia (YSZ) thin film processing. Various processing parameters, such as the ratio of oxygen to liquid fuel in flame, the concentration of metal reagents in the solution, the temperature of the substrate, and so on, have been investigated. The as-grown films are characterized with x-ray diffraction and scanning electron microscopy. Within the range of experimental parameters, the phase of the film is predominately cubic one. It was shown that the phase and crystallinity of the films are strongly dependent upon the experimental variable.","PeriodicalId":141352,"journal":{"name":"Effects of Processing on Properties of Advanced Ceramics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129984910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Processing, Understanding, and Application of Piezoelectric Materials for an Artificial Neural System 压电材料在人工神经系统中的加工、理解与应用
Effects of Processing on Properties of Advanced Ceramics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/md-24807
M. Schulz, S. Chattopadhyay, M. Sundaresan, A. Ghoshal, W. N. Martin, P. R. Pratap
{"title":"Processing, Understanding, and Application of Piezoelectric Materials for an Artificial Neural System","authors":"M. Schulz, S. Chattopadhyay, M. Sundaresan, A. Ghoshal, W. N. Martin, P. R. Pratap","doi":"10.1115/imece2001/md-24807","DOIUrl":"https://doi.org/10.1115/imece2001/md-24807","url":null,"abstract":"\u0000 Piezoelectric materials are opening the door for the design of large smart structures. To explore what possibilities there might be for building practical smart structures, a review of the characteristics and methods of processing piezoelectric active materials is given. The advantages and limitations of using the different forms of piezoelectric materials for sensors and actuators are then discussed. One area where piezoceramic sensors can have a large impact is structural condition monitoring. Structural condition monitoring refers to using in-situ sensors to monitor the internal loads and the health of a structure in real-time. This will allow a structure to be operated at its maximum performance and efficiency while minimizing the fatigue damage. To achieve this on a large structure, a new highly distributed sensor concept is discussed in which piezoceramic fibers and microelectronic components are used to mimic the biological nervous system. A simplified simulation and experiment are presented to show how this artificial neural system can measure dynamic strains and acoustic emissions caused by damage in structures.","PeriodicalId":141352,"journal":{"name":"Effects of Processing on Properties of Advanced Ceramics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130547452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Mechanical Properties of Novel Nanocrystalline Materials 新型纳米晶材料的力学性能
Effects of Processing on Properties of Advanced Ceramics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/md-24806
J. Narayan, H. Wang, A. Kvit
{"title":"Mechanical Properties of Novel Nanocrystalline Materials","authors":"J. Narayan, H. Wang, A. Kvit","doi":"10.1115/imece2001/md-24806","DOIUrl":"https://doi.org/10.1115/imece2001/md-24806","url":null,"abstract":"\u0000 We have synthesized nanocrystalline thin films of Cu, Zn, TiN, and WC having uniform grain size in the range of 5 to 100 nm. This was accomplished by introducing a couple of manolayers of materials with high surface and have a weak interaction with the substrate. The hardness measurements of these well-characterized specimens with controlled microstructures show that hardness initially increases with decreasing grain size following the well-known Hall-Petch relationship (H∝d−½). However, there is a critical grain size below which the hardness decreases with decreasing grain size. The experimental evidence for this softening of nanocrystalline materials at very small grain sizes (referred as reverse Hall-Petch effect) is presented for the first time. Most of the plastic deformation in our model is envisioned to be due to a large number of small “sliding events” associated with grain boundary shear or grain boundary sliding. This grain-size dependence of hardness can be used to create functionally gradient materials for improved adhesion and wear among other improved properties.","PeriodicalId":141352,"journal":{"name":"Effects of Processing on Properties of Advanced Ceramics","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124277794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Minimization of Stress at Metal-Ceramic Interfaces Using Functionally Graded Materials 利用功能梯度材料实现金属-陶瓷界面应力最小化
Effects of Processing on Properties of Advanced Ceramics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/md-24801
Hugh Alan Bruck, H. Surendranath
{"title":"Minimization of Stress at Metal-Ceramic Interfaces Using Functionally Graded Materials","authors":"Hugh Alan Bruck, H. Surendranath","doi":"10.1115/imece2001/md-24801","DOIUrl":"https://doi.org/10.1115/imece2001/md-24801","url":null,"abstract":"\u0000 There is a great deal interest in minimizing thermal and residual stresses at the interfaces of metals and ceramics. These stresses develop because of the large mismatch in thermally induced strains that exists between these two materials. The differences are significant enough to cause premature component failure in a variety of applications, including thermal barrier coatings (TBCs) for turbine blades and ceramic coatings for cutting tools. One approach to minimizing these stresses involves functionally grading the material distribution at the metal-ceramic interface. A significant amount of effort has been focused on the development of functionally graded nickel-alumina composites as a model system to determine the architectural features of the material gradient that will minimize these stresses. This effort has led to the development of an experimentally verified modeling approach based on thermomechanical, elastoplastic finite element analysis that can be used to predict the stress distributions in functionally graded metal-ceramic composite materials. This approach has been coupled with a mathematical optimization technique, known as a Genetic Algorithm (GA), to determine the optimal architecture for minimizing thermal and residual stresses at metal-ceramic interfaces.","PeriodicalId":141352,"journal":{"name":"Effects of Processing on Properties of Advanced Ceramics","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117308519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Diamond and Diamondlike Composites 金刚石和类金刚石复合材料
Effects of Processing on Properties of Advanced Ceramics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/md-24804
R. Narayan, Q. Wei, J. Sankar, J. Narayan
{"title":"Diamond and Diamondlike Composites","authors":"R. Narayan, Q. Wei, J. Sankar, J. Narayan","doi":"10.1115/imece2001/md-24804","DOIUrl":"https://doi.org/10.1115/imece2001/md-24804","url":null,"abstract":"\u0000 Diamond, diamond-like, and their composites (with TiC, TiN, and AlN for diamond, and Cu, Ag, Ti, and Si for diamondlike carbon) have extremely desirable chemical, electrical, and mechanical properties. These corrosion- and erosion-resistant coatings have a wide variety of applications, ranging from biomedical device coatings to packaging of microelectronic devices. However, many of these applications are limited by the poor adhesion of these films to metals, ceramics, and polymers. The adhesion of a film is determined primarily by internal stresses in the film, thermal and lattice mismatch, and most importantly by interfacial bonding. We have developed methods based on mechanical interlocking, chemical bonding, grading of interatomic potentials, and the multilayer discontinuous thin films approach to control stresses and strains in thin films. A substantial improvement in adhesion and wear properties is obtained by using these methods selectively. We review issues related to the adhesion of diamond, diamond-like carbon, and composite films on metal, polymeric, and ceramic substrates.","PeriodicalId":141352,"journal":{"name":"Effects of Processing on Properties of Advanced Ceramics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131302565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nanofunctionalized Phosphor Particles for Advanced Display Applications 用于高级显示的纳米功能化荧光粉颗粒
Effects of Processing on Properties of Advanced Ceramics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/md-24808
M. Ollinger, V. Craciun, R. Singh
{"title":"Nanofunctionalized Phosphor Particles for Advanced Display Applications","authors":"M. Ollinger, V. Craciun, R. Singh","doi":"10.1115/imece2001/md-24808","DOIUrl":"https://doi.org/10.1115/imece2001/md-24808","url":null,"abstract":"\u0000 Cathodoluminescence (CL) degradation measurements showed that by applying a nano meter scale indium tin oxide (ITO) coating on micron sized ZnS:Ag particulates the degradation lifetime was dramatically improved. X-ray photoelectron spectroscopy (XPS) analysis showed that the Zn 2p3/2 and S 2p3/2 peaks of the degraded ZnS:Ag were shifted to higher binding energies, which correspond to oxidized elements, with respect to those found for as-received ZnS:Ag. The XPS analysis for the ITO coated ZnS:Ag showed a broadening of the Zn 2p3/2 and S 2p3/2 peaks, which were a convolution of two peaks. In this case, the Zn 2p3/2 and S 2p3/2 peaks corresponding to ZnS were still present together with a small shoulder corresponding to the oxidized elements. This difference in the XPS shows that the ITO coating reduced the degradation rate by slowing the surface chemical changes on the ZnS:Ag.","PeriodicalId":141352,"journal":{"name":"Effects of Processing on Properties of Advanced Ceramics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115433421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Understanding the Effects of Processing on the Mechanical Behavior of a SI3N4 Ceramic Through Microstructural Investigations 通过显微组织研究了解加工对SI3N4陶瓷力学行为的影响
Effects of Processing on Properties of Advanced Ceramics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/md-24802
Q. Wei, J. Sankar
{"title":"Understanding the Effects of Processing on the Mechanical Behavior of a SI3N4 Ceramic Through Microstructural Investigations","authors":"Q. Wei, J. Sankar","doi":"10.1115/imece2001/md-24802","DOIUrl":"https://doi.org/10.1115/imece2001/md-24802","url":null,"abstract":"\u0000 The mechanical properties of silicon nitride (Si3N4) ceramics are determined by their microstructure, which in turn depends on processing routes adopted to fabricate the material. To obtain dense Si3N4, sintering aids are almost always added during the densification process. The sintering aids remain in the ceramics as amorphous residues which adversely affect the high temperature mechanical behavior of the material.\u0000 In this paper, we have investigated the effects of processing on the mechanical behavior of a sintered Si3N4 ceramic through detailed microstructural observations. A commercial Si3N4 was annealed using conventional furnace annealing and microwave annealing at different temperatures. Creep tests were performed to compare the high temperature mechanical behavior of the as-sintered and annealed ceramics. It was found that microwave and furnace annealing heat-treatments improve the creep resistance of the ceramic through devitrification of the triple junctions phases.","PeriodicalId":141352,"journal":{"name":"Effects of Processing on Properties of Advanced Ceramics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123579924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tunable Magnetic and Mechanical Properties in Metal Ceramic Composite Thin Films 金属陶瓷复合薄膜的可调磁性和机械性能
Effects of Processing on Properties of Advanced Ceramics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/md-24805
D. Kumar, J. Sankar, J. Narayan, A. Kvit
{"title":"Tunable Magnetic and Mechanical Properties in Metal Ceramic Composite Thin Films","authors":"D. Kumar, J. Sankar, J. Narayan, A. Kvit","doi":"10.1115/imece2001/md-24805","DOIUrl":"https://doi.org/10.1115/imece2001/md-24805","url":null,"abstract":"\u0000 Presently a wide spread of research activities is pursued in the area of theoretical, computational and experimental aspects of vibration studies in laminated composite structures with embedded or surface bonded smart layers in order to improve the performance of components in aerospace, mechanical, robotics, and electronic equipments. The key to the successful fabrication of these components with improved properties is the development of smart materials by materials engineering and understanding the fundamentals of materials science. It is in this context that we have developed a novel smart thin film processing method based upon pulsed laser deposition to process nanocrystalline materials with accurate size and interface control with improved mechanical and magnetic properties. Using this method, single domain nanocrystalline Fe and Ni particles in 5–10 nm size range embedded in amorphous as well as crystalline alumina have been produced. By controlling the size distribution in confined layers, it was possible to tune the magnetic properties from superparamagnetic to ferromagnetic in a controlled way. Magnetization measurements of these thin film composites as function of field and temperature were carried out using a superconducting quantum interference device (SQUID) magnetometer. Magnetic hysteresis characteristics below the blocking temperature are consistent with single-domain behavior. Mechanical properties were measured using nano-indentation measurements. The hardness of the Fe and Ni-Al2O3 nanocomposites was found to vary strongly with the size do Fe and Ni nanodots in the alumina matrix. For example, the hardness of Fe-Al2O3 system increased from 15 GPa to 28 GPa when the size of Fe dots in alumina was increased from 5 nm to 9 nm. It is envisioned that this types of smart films can be used in magnetic recording, ferrofluid technology, magnetocaloric refrigeration, biomedicine, biotechnology, aerospace applications where hard and wear-resistant coatings are also very important for its survival.","PeriodicalId":141352,"journal":{"name":"Effects of Processing on Properties of Advanced Ceramics","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121369059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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