车用陶瓷新材料成为节能减排新亮点

随着科学技术的不断发展,汽车的研发及生产阶段越来越多地采用新材料及新工艺,这也使得人们对汽车轻质化、低成本、智能化、经济性和可靠性的要求成为可能。特种陶瓷具有各种优异、独特的性能,应用在汽车上,对减轻车辆自身质量、提高发动机热效率、降低油耗、减少排气污染、提高易损件寿命、完善汽车智能性功能都具有积极意义。车用陶瓷已引起工程领域材料科学的关注,根据碳化硅等特种陶瓷的结构性能及种类,分别介绍了陶瓷发动机、热敏陶瓷传感器、车用催化净化器的陶瓷载体、尾气净化蜂窝陶瓷材料载体、柴油车排气净化陶瓷蜂窝过滤器和陶瓷汽车制动器刹车片,以及车用陶瓷轴承等实例,充分反映了车用陶瓷新材料的研究和开发其应用前景广阔。     

特种陶瓷在现代工业中的应用现状

叙述了特种陶瓷的优异性能 ,它是一种重要的工业新材料。介绍了特种陶瓷在机械、电子、军用、生物医学、医疗卫生等领域的开发应用情况 ,阐述了大力开发特种陶瓷的广阔前景     

低碳经济给力车用特种陶瓷材料异军突起

由于特种陶瓷在热学、力学、化学、电磁学等方面,以及在化学组成、内部结构、性能和使用效能各方面均不同于传统陶瓷,具有各种优异独特的性能,决定了它的广泛适用性。特种陶瓷应用于汽车上,可以有效降低车辆的重量,降低油耗,提高发动机的热效率,减少排气污染,提高易损件寿命、完善汽车智能性功能都具有积极意义。首先综述了节能环保的车用...     

佛山加速发展特种陶瓷

前不久,从佛山经贸局了解到,为培育新兴产业和新的经济增长点,促进陶瓷产业的优化升级,佛山将举行特种陶瓷的推介会,加快发展特种陶瓷。特种陶瓷具有技术含量高、耗材耗能少、附加值高、占地少、污染源少等优点。同时,特种陶瓷具有各种现有材料中所没有具备的优异性能,在高技术领域中,像机械、电子信息、航空航天、汽车、能源、生物和国防等,     

陶瓷走向新时代

特种陶瓷是陶瓷家族中的新成员，具有特殊优异的性能和非常广泛的用途，是新时代高科技的骄子，有着光辉灿烂的未来，它在许多领域取代了金属和高分子材料，而独具不可替代的作用。发展特种陶瓷前景广阔，机不可失。本文叙述了当代特种陶瓷的发展趋势。     

特种陶瓷超高温梭式窑设计及热工特性

１ 前 言 随着特种陶瓷的迅速发展,超高温梭式窑在国内相继出现。特种陶瓷的烧结形式有多种：主要有连续或热压烧结炉,连续式真空（氧分）烧结炉和间歇式常压烧结炉──即超高温烧结炉。从生产实践中看应用较多的还是间歇式超高温常压烧结炉。 特种陶瓷具有高强度,高韧性、耐高温、耐磨和优异的力学、热学性能,所以特种陶瓷须具有优越的超高温烧结条件及设施。 近年来,间歇式超高温烧结炉引起了热工学者们的重视,因此对现有特种陶瓷超高温梭式窑的设计进行探讨、研究 进一步了解其热工特性,对改进超高温梭式窑的设计具有极其重要的意…     

工业陶瓷精密加工技术的研究现状

工业陶瓷具有高强度、高硬度、耐高温和抗腐蚀等优异性能,在机械电子、航空 航天、军事国防等领域有着广泛的应用。陶瓷产品存在高脆性的特点,在工业陶瓷加工时会出 现裂纹和崩溃等问题。在过去几十年中,改善传统机械加工技术、应用新型特种加工技术以及 研究复合加工技术方法成为一个共同关注的问题,研究成果在提高工业陶瓷的加工效率、保证 陶瓷产品表面完整性方面发挥出了积极的作用。本文总结了工业陶瓷精密加工技术研究进展。     

成形是制备特种陶瓷材料的重要环节,檹特种陶瓷的成形方法有哪些?

正答:特种陶瓷是一类采用高精度精选原料,具有能精确控制化学组成,按照便于控制的制造技术加工,便于进行结构设计,并具有优异特性的陶瓷。因具有良好的力学、电学、光学和生物学等特性,已成为航空航天、能源、机械、电子信息和生物工程等领域高技术的基石。特种陶瓷成形是特种陶瓷制备的一个重要环节,是将     

新型陶瓷的注射成形技术

新型陶瓷亦称精密陶瓷、特种陶瓷、现代陶瓷或高技术陶瓷。它是采用高度精选的原料,按照特别设计的制造工艺生产,能精确控制化学组成和具有优异性能的陶瓷。目前,新型陶瓷主要使用在高技术和尖端工业,如微电子、核反应堆、航天、磁流体发电、人工骨和人工关节等方面。新型陶瓷在制造工艺上,应当满足以下三方面的要求。①精选的原料要选用高纯度的,颗粒应尽可能的细;②严格控制化学成分。制造过程中要防止杂质混入和成份本身的挥发,对烧结     

微波烧结工艺对Sialon陶瓷刀具材料力学性能的影响

采用微波烧结技术制备Sialon陶瓷刀具材料,主要研究烧结温度和保温时间对Sialon陶瓷刀具材料力学性能的影响规律,并结合微观形貌对其影响规律进行分析,旨在制备性能优异的陶瓷刀具材料。结果表明：在烧结温度为1 600℃、保温时间为15 min时,刀具材料具有最优的力学性能,其致密度、Viekers硬度、断裂韧性分别为98.9%、17.8 GPa和5.9 MPa·m^1/2。在此烧结工艺下,样品的微观组织均匀,内部气孔较少,有利于材料力学性能的提高。采用微波烧结技术可以在较短的保温时间内得到性能优异的陶瓷刀具材料,提高了生产效率。     

Orange-emitting MgO–(Sr,Ba)3SiO5:Eu composite phosphor ceramics for turn signals and warm white laser lighting

The research and development of orange-emitting phosphor ceramics with excellent performance are significant for improving the optical quality of laser lighting and developing-related emerging applications. For the first time, we prepared an orange-emitting MgO–(Sr,Ba)₃SiO₅:Eu composite phosphor ceramic with high thermal conductivity, high thermal stability, and excellent luminescence properties. The thermal conductivity of the phosphor ceramic is as high as 32 W/(m K), and the luminescence intensity decreases by only 20% at 200°C, both of which are better than other orange-emitting phosphor ceramics reported so far. The luminous efficacy of the phosphor ceramic (41.6 lm/W) is also close to the highest value of orange-emitting phosphor ceramics until now. In addition, we also explored the application prospects of the composite phosphor ceramics in automotive turn signals and warm white laser lighting. This work provides inspiration for the preparation of other excellent orange-emitting phosphor ceramics in the future.     

Research and prospect of ceramics for automotive disc-brakes

This article mainly discusses the research status and development trends of ceramics for automotive disc-brakes. According to the ceramic disc-brakes, various properties and characteristics, including fracture toughness, strength, compactness, corrosion resistance, wear resistance, micro-morphology, and thermal stabilities are analyzed. In the field of disc-brakes research, the research directions of the ceramics, including high-temperature performance, bionic structure, layered structure, porous structure, eutectic performance, superhard structure, and machinability are analyzed. The analysis of ceramics is expected to find disc-brake materials in line with the future development trends.     

低碳经济驱动新型陶瓷材料行业的未来

新型陶瓷材料具有高强、高硬、耐腐蚀、耐高温等特性。近些年来,在开发新能源和有效利用石油能源的呼声中,发达国家相继掀起了新型陶瓷材料研究开发的热潮。针对新型陶瓷材料的独特性能,综述了工程陶瓷材料用途广泛和特殊性能的功能陶瓷材料广阔应用前景;以及陶瓷基复合材料具有广泛的发展趋势;介绍了广泛应用于工程领域的陶瓷阀门材料和切削性能优良的新型陶瓷刀具;同时指出了陶瓷材料产业的应用开发趋势。     

新型高性能氧化锡压敏陶瓷的研究

本研究用化学级原料成功地制备出具有良好非线性电流-电压特性的SnO2压敏陶瓷,研究了新型SnO2压敏陶瓷的组成及制备方法,分析了有关性能参数,讨论了组成、显微结构和电性能之间的关系。其目的是开发出性能好、成本低的新一代压敏陶瓷材料。     

探秘新型结构陶瓷材料及其运用与发展

先进的结构陶瓷材料由于具有一系列优异的性能,在节约能源、节约贵重金属资源、促进环境保护、提高生产效率、延长机器设备寿命、保证高新技术和尖端技术的实现等方面都发挥了积极的作用,受到业内的广泛关注。根据先进的结构陶瓷在工业工程中的应用效益显著,分析了先进结构陶瓷的主要组成物、性能特点及其应用领域,研究了先进结构陶瓷材料的新产品开发,介绍了先进结构陶瓷材料在发动机上的运用实例,同时指出了先进结构陶瓷材料的发展前景及趋势。     

Evaluation of Silicon-Nitride Ceramic Valves

Silicon-nitride ceramic valves can improve the performance of both light- and heavy-duty automotive engines because of the superior material properties of silicon nitrides over current metal alloys. However, ceramics are brittle materials that may introduce uncertainties in the reliability and durability of ceramic valves. As a result, the lifetime of ceramic valves are difficult to predict theoretically due to wide variations in the type and distribution of microstructural flaws in the material. Nondestructive evaluation (NDE) methods are therefore required to assess the quality and reliability of these valves. Because ceramic materials are optically translucent and the strength-limiting flaws are normally located near the valve surface, a laser-scatter method can be used for NDE evaluation of ceramic valves. This paper reviews the progress in the development of this NDE method and its application to inspect silicon-nitride ceramic valves at various stages of manufacturing and bench and engine tests.     

Effects of carbon additives on the properties of ZrB2–based composites: A review

This review presents the recent achievements on carbon additives incorporated in ZrB₂ ceramics, improved properties, and their advancements. Monolithic ZrB₂ ceramics have broad potential applications, but their critical drawbacks such as poor damage tolerance, and weak oxidation and ablation resistance confines their applicability. It is an important issue to resolve these shortages in physiochemical properties by engineering the composite ingredients and process design of the ceramic counterparts for an extensive production and applications, which are especially essential in high–tech industries and products. Carbon additives have exceptional characteristics including low density, low cost, and excellent thermo–mechanical stability. These materials have been incorporated in ZrB₂ ceramics to enhance their efficiency and form practical composite ceramics. Although addition of the secondary carbonaceous phases is generally supposed to improve the mechanical properties of ZrB₂ composites, it may also result in a decrease in other aspects of performance, comparing with monolithic ZrB₂ ceramics. In this work, we reviewed the methods and strategies for the preparation of carbon modulated ZrB₂ ceramic composites. Moreover, the advantages, disadvantages, and the productivity of the introduced composite ceramics have been explored and featured.     

A review of the research progress on the interface between oxide fiber and oxide ceramic matrix

Oxide ceramics have excellent high temperature performance, superior thermal and chemical stability, which can be used in high temperature oxidizing environments, while oxide ceramics generally have low toughness and are prone to catastrophic damage... Oxide ceramics can be reinforced by high performance ceramic fibers to improve the fracture strength and fracture toughness, thus expanding its application in high-temperature components such as aero-engine combustion chambers and tail nozzles. The interface between fiber and matrix is an important factor that determines the performance of the composites. By tailoring the interface, the energy dissipation mechanisms such as fiber debonding and fiber pull-out can be brought into play to avoid the catastrophic damage of the composites. This review paper summarizes the recent research progress of the oxide fiber/oxide ceramic matrix composites interface. The mechanical properties of the interface and the design principles of the interface engineering are discussed, and types of interfaces and coating preparation methods are reviewed.