膨胀珍珠岩—废玻璃复合饰面板的烧地机理研究

利用差热分析和扫描电镜测试技术，分析了膨胀珍珠岩－废玻璃复合饰面反在烧结过程 不同温度下的变化，认为其烧结的主要传质作用为占性流动。烧结机理的研究表明，复合饰面板存在一个最佳烧结温度和保温时间。     

石膏基复合饰面板的研究

本文进行了以石膏为主要原料生产石膏基复合饰面板的研究,找出了生产该复合饰面板的最佳参数,并测试了该复合饰面板的有关性能。研究结果表明,以石膏为主要原料可生产出性能好的复合饰面反,是优良的室内装修材料,该材料生产成本低,具有十分广阔的市场。     

建筑外墙保温饰面板的环温辐射解耦测试方法

针对环温和辐射耦合测试工况下的建筑外墙保温饰面板，提出一种解耦测试方法。首先，通过信号处理的方法，对饰面板的温度和应变测量信号作 S 域分析，找到解耦测试信号和耦合测试信号之间的传递函数。其次，通过建立保温饰面板的传热及热应变有限元计算模型，采用数值模拟验证解耦测试方法的准确性。结果表明，温度和应变的耦合与解耦信号高度吻合，应变耦合与解耦信号在非辐射区域较辐射区域延迟大约 10 h。     

3%C-Cu机械球磨复合粉末的烧结

为了给后续的致密化工序（如热挤压）提供较高质量的烧结坯,用扫描电镜和光学显微镜分析了3%C-Cu机械球磨复合粉末所制备烧结坯的显微组织,并研究了工艺参数对其相对致密度的影响规律。结果表明,烧结温度对未机械球磨混合粉烧结行为的影响很大,而机械球磨复合粉对烧结温度不敏感。真空热压烧结可以明显地促进致密化过程。提高烧结温度、延长烧结保温时间或增加热压压强,均有助于提高烧结坯的相对致密度。在相同条件下,烧结坯的相对致密度随着复合粉末机械球磨时间的延长而降低。     

复合掺杂CeO2基电解质性能与烧结温度关系

实验发现，用复合掺杂法可以有效地降低ＣｅＯ２基电解质的烧结温度．用Ｓｍ２Ｏ３和Ｇｄ２Ｏ３共同掺杂时，可以使ＣｅＯ２基电解质的烧结温度从１６００℃左右降低到１４００—１４５０℃．复合掺杂的ＣｅＯ２基电解质电导率随着烧结温度的提高而下降，这可能是由于晶间玻璃相的增多和新相的出现造成的；Ｘ射线衍射分析发现，对１４００—１５５０℃烧结的样品，Ｓｍ２Ｏ３和Ｇｄ２Ｏ３固溶较好，但对１６００℃烧结的样品，可见新相生成，同时伴随着晶格常数减小．     

Si3N4-SiO2复合材料的制备及介电性能研究

以国产氮化硅、二氧化硅粉为原料，以氧化镁、氧化铝为烧结助荆，经干压成型后，在流动的高纯N2作为控制气氛的条件下，常压烧结出结构均匀，具有良好介电性能的Si3N4-SiO2复合材料。研究了原料、烧结温度、烧结助剂对材料介电性能的影响。结果表明：SiO2、MgO、Al2O3可促进坯体的烧结及致密，同时时材料的介电性能有较大的影响。当烧结温度低于1550℃时，随着烧结温度的升高，材料的介电常数趋于增大。当烧结温度高于1550℃时，随着温度的升高，材料中缺陷增加，相对密度降低，因此材料的介电常数趋于减小。     

膨胀珍珠岩和废玻璃复合饰面板的缺陷成因及其消除的研究

采用红外光谱、电子探针等现代测试方法，对膨胀珍珠岩和废玻璃复合饰面板的缺陷成因进行了较为深入和系统的研究，并提出了相应的解决措施。这对于实现该产品的工业化生产具有重要的指导意义。     

复合有机材料激光烧结成型性能试验研究

目的研究复合有机成型材料激光烧结成型性能．方法在线扫描激光烧结实验装置上,研究了铺粉厚度、预热温度及激光束参数与复合有机材料激光烧结成型性能的关系．结果利用实验测量结果,对复合有机材料激光烧结成型性能的影响因素进行了分析．结论必须合理选择工艺参数,才能得到理想的烧结成型质量．     

烧结温度对BN陶瓷材料强度的影响

采用热压烧结(HP)法制备纯BN陶瓷和B2O3-BN陶瓷复合材料．利用三点弯曲方法测定了这两种材料的抗弯强度、弹性模量等力学性能，通过扫描电镜对两种材料的断口进行了分析。结果表明：纯BN陶瓷烧结温度达到1800℃时相对质量密度和强度较低；添加B2O3烧结温度超过900℃时可以形成液相，改善了BN的烧结性能，提高了B2O3-BN复合陶瓷的相对质量密度，从而提高了材料的强度。     

二氧化硅对液相合成（SrPb）TiO3其陶瓷热敏特性的影响

研究了二氧化硅对陶瓷材料阻温特性和烧结特性的影响，实验结果表明：烧结助剂二氧化硅的加入可以使材料的烧结温度降低，改善材料的Ｖ型ＰＴＣ复合热敏性能。在１１５０℃烧结时，其最佳加入量ｗｓｉｏ２为５％，材料的最低电阻率为３．１×１０＾２Ω·ｃｍ。     

纳米复相陶瓷的制备方法综述

纳米复相陶瓷是一种新型复合材料，它的综合性能相对传统陶瓷有了很大的提高。目前为止，纳米复相陶瓷粉体的制备方法主要有机械球磨、均相复合、非均相复合等，纳米复相陶瓷的烧结方法有无压烧结、热压烧结、热等静压烧结、放电等离子烧结、微波烧结等。对于纳米复相陶瓷而言，热等静压烧结、放电等离子烧结、微波烧结是比较理想的烧结方法。     

选择性激光烧结过程温度场数值模拟

目的　研究激光烧结过程的温度场 ,分析在选定烧结参数下的烧结深度及烧结宽度 .方法　分析烧结过程及热物性参数之间的变化关系 ,建立合理的有限元模型 ,编制相应的程序对其温度场进行模拟 ;由温度值确定其烧结深度及宽度 ,并用实测温度验证了计算结果 .结果　模拟结果与实测结果相差甚小 .结论可用数值模拟方法进行工艺参数选择     

Kinetics mechanism of microwave sintering in ceramic materials

Based on the traditional sintering model incorporating the characteristic of microwave sintering, the ionic conductance diffusion mechanism in microwave sintering was studied. A flat-ball model was presented to describe the kinetics process in microwave sintering, and was applied to the sintering process of TZP and ZrO₂-Al₂O₃ ceramics. The results indicate that the shrinkage rate of materials in microwave sintering is proportional to t ^2/3 and r ^−4/3, respectively, where t is the sintering time and r is the particle radius. Whereas, the shrinkage rate of materials in conventional sintering is proportional to sintering time t ^2/5. Our model suggests that microwave sintering is faster than conventional sintering, which shows a good agreement with the experimental observation in sintering process of TZP and ZrO₂-Al₂O₃. Supported by the State Key Program of National Natural Science of China (Grant No. 50332010) and the National Key Technology Research and Development Program for Resource and Environment of China (Grant Nos. 2006BAB12B03, 2006BAB12B05)     

Manufacture of the Ultrafine Grain WC/Co Cemented Carbides by Combined Sintering Processing

A new kind of sintering process, combined sintering process. i.e. vacuum sintering plus hot isolate pressure sintering (HIP), was introduced for producing ultrafine WC-10% Co (mass fraction. so as the follows) cemented carbides. The effects of some processing parameters on the microstructure and mechanical properties of the obtained cemented carbides were studied. The results show that the rapid shrinkage and the pronounced densification of tile cemented carbides took place during the vacuum sintering stage, which is intinaately correlated with the local liquid sintering occurred during this earl} sintering stage for the high surface activity of ultrafine WC-Co powder. The way of high pressure imposing. isothermal treatment cycle during ac.acuum sintering and HIP sintering stage directly influence the densitication of compacts and the mechanical properties of the produced WC-10%Co cemented carbides.     

羟基磷灰石的微波烧结

对羟基磷灰石的微波烧结进行了系统研究,确定了制备致密HAP生物陶瓷材料的最佳微波烧结工艺条件.通过XRD、SEM等手段研究了烧结温度和时间对HAP生物陶瓷的物相和显微结构的影响,测试了烧结收缩率和抗折强度.结果表明,微波烧结利于HAP陶瓷坯体的致密化,可以实现低温快速烧结,并提高陶瓷的机械强度;微波烧结对HAP的分解有促进作用,而且随着烧结温度升高和时间延长HAP分解程度增大.1 200℃烧结30 min的HAP陶瓷样品抗折强度最高,为(95.42±3.45)MPa,其主晶相为HAP和β-TCP.     

RESEARCH ON MICROWAVE SINTERING ALUMINA CERAMICS

This paper introduces the characteristic of microwave sintering,introduces and analyses the process of microwave sintering of the alumina ceramics, moreover, compared with the experiments of conventional sintering method. Based on the researcb, some results are obtained, and experimental basis for microwave sintering of ceramecs is put forwarrd.     

LOW TEMPERATURE SINTERING OF FLY-ASH CERAMICS AND ITS MICROSTRUCTURE

In this paper, the fly-ash ceramics with prior physical properties was fabricated in a low sintering temperature range. XRD, SEM were used to study the microstructure and sintering mechanism. The results show that in this fly-ash ceramics,three kinds of matter form its structure frame such as the glass pearls from the fly-ash raw materials, quartz and mullite in which glass liquid phase was produced during sintering. And the sintering mechanism is that of liquid sintering.     

Microstructure and mechanical properties of 8YSZ ceramics by liquid-phase sintering with CuO-TiO2 addition

The 8% (mass fraction) yttrium-partially-stabilized zirconia (8YSZ) ceramic was fabricated via liquid phase sintering at 1 200–1 400 °C by adding different mass ratios of CuO-16.7%TiO₂ (molar fraction) as sintering aid. Relative density, microstructure, Vickers hardness and bending strength as a function of sintering temperature and additive content were investigated. The experiment results show that liquid phase sintering at low temperature can be realized through adding CuO-16.7% TiO₂ to 8YSZ. The Vickers hardness and bending strength of samples with sintering aid are generally much higher than those of samples without sintering aid for all sintering temperatures, and increase with the increase of sintering temperature. When the addition content of CuO-16.7% TiO₂ is beyond 0.5%, the relative density, Vickers hardness and bending strength decrease with the increase of the mass ratio of sintering aid. Low additions of sintering aid are beneficial to aiding densification; high additions of sintering aid are detrimental to the sintered properties mainly due to greater amounts of pores generated by the volatilization of oxygen with the eutectic reaction between copper oxide and titanium dioxide. It is found that the fine grain size and high relative density are two main reasons of the high bending strength and Vickers hardness of the materials.     

低温烧成粉煤灰陶瓷墙地砖坯体微观结构及烧成机理的研究

本文采用粉煤灰为主要原料,在较低的烧成温度下研制了性能优良的粉煤灰陶瓷墙地砖。着重研究了粉煤灰陶瓷的显微结构,分析了瓷体在烧成过程中的物理化学变化,探讨了粉煤灰陶瓷的低温烧成机制。进行x射线衍射和扫描电子显微镜研究,结果表明:粉煤灰陶瓷的显微结构是以粉煤灰原料中的非晶态玻珠和少量的结晶矿物石英及莫来石为骨架,烧成时产生的大量液相致密地填充骨架而构成的。粉煤灰陶瓷的烧结属于液相烧结,这种烧成机制决定粉煤灰陶瓷可以在低温下烧成。     

钼/铜复合材料快速成型制备工艺研究

提出一种基于快速成型技术的制备钼/铜复合材料的新方法.采用包覆树脂膜低温粉碎研磨制粉的方法,得到了适于选择性激光烧结快速成型用覆膜钼粉;进行了选择性激光烧结成型实验研究,获得优化的工艺参数;开发了高温烧结钼骨架结合渗铜的成型件后处理工艺,得到钼/铜复合材料样件.用扫描电镜(SEM)观察发现,材料中条形钼相组织主要是由多边形的晶粒结合体构成,铜已经与钼紧密结合在一起,形成钼/铜复合材料,其中只有微量孔隙.对材料进行了主要的力学、热学性能测试计算,分别为:常温抗拉强度470 MPa,弹性模量267.8 GPa,延伸率15%,线膨胀系数5.5× 10-6/K.钼/铜复合材料快速制备工艺可应用于兵器弹箭、航空武器等装备的高温零部件和电子工业高电导散热元件的制造.