尼龙—6自润滑复合材料研究

本文采用烧结成型方法，在较好烧结工艺条件下研究了尼龙－６自润滑复合材料的物理，机械性能与组成间的关系；并得到了最好的自润滑复合材料的组成为：７２％尼龙－６加２％Ｋｋｏｎｏｌ加５％玻纤加３％石墨。     

硅灰石填充改性尼龙12激光烧结材料

将尼龙12与硅灰石的混合粉末进行选择性激光烧结成型。研究了硅灰石对尼龙12烧结材料的填充改性作用。结果表明，烧结件的拉伸强度、弯曲强度及模量均随硅灰石含量的增加而显著增加，并在硅灰石质量分数为30％时，达到最大值，分别比未添加硅灰石的烧结件增加了35％、75％和111％，但冲击强度和断裂伸长率则有所降低。同样，加入硅灰石后，可使烧结件的热变形温度大幅度提高，同时提高了烧结件的尺寸精度，大大降低了材料成本。     

含油铸型尼龙研究

在己内酰胺的阴离子聚合过程中加入一种特别设计的油化合物可得一种新型自润滑工程塑料。这种材料不仅改善了铸型尼龙的摩擦特性。并基本保持其力学性能不发生改变,且加工工艺仍十分简便。     

R535A纺丝机传动箱体的无油润滑改造

运用MC尼龙材料对R535A纺丝机传动箱的零部件进行改造，实现了无润滑油的自润滑传动，降低了设备故障率，延长了零件使用寿命和设备维修周期，杜绝了漏油对产，品质量的影响，并提高了酸站微孔过滤器的效率。     

聚合物基自润滑轴承材料

概述了热塑性塑料基和热固性塑料基自润滑轴承材料，重点介绍了以PTFE和聚酰胺为基础的热塑性塑料基自润滑轴承材料，总结了聚合物基自润滑轴承材料的研究热点。     

尼龙塑料在造纸工业的应用

龙尼塑料是最早的工程塑料，它具有优异的机械性能、耐磨、耐油、自润滑，使用温度范国宽等特点。尼龙品种繁多，主要的是尼龙-66和尼龙-6.尼龙塑料应用广泛，特别是代替一些金属作机械部件显示出其优越性。自lop年以来，研究开发用尼龙工程塑料代替造纸机械中的金属材料，取得了一定成果。原为铸钢的纸机驱动拱缸转动的小齿轮，改为尼龙材料小齿轮，具有运转平稳、无噪百、应损极小等优点。备水车间用于输送木材的板式拉木机轮膨，原为球墨铸铁，改为尼龙塑料材质后，运转灵活，无噪音，耐应性提高了3倍以上，成本降低40％。抄纸机喷浆口处…     

填料对尼龙12烧结工艺的影响

在尼龙12选择性激光烧结材料中添加不同的填料,研究了各种填料对激光烧结过程中的铺粉性、预热温度、激光功率等工艺性能的影响。结果表明,添加玻璃微珠的烧结材料铺粉性好、预热温度范围宽、烧结工艺性良好;滑石粉亦可改善尼龙12烧结工艺性,而粒径小于2μm的轻质碳酸钙、陶瓷微珠等填料则对尼龙12烧结工艺有不良影响。     

Al2O3＋CaF2＋Glass自润滑复合材料摩擦磨损的研究

采用热压烧结工艺研制了Ａｌ２Ｏ３＋ＣａＦ２＋Ｇｌａｓｓ（ＡＦＧ）系列陶瓷自润滑复合材料,并对其室温干摩擦下的摩擦磨损行为及自润滑机理进行了研究。结果表明,适量的润滑相ＣａＦ２粒子分布于硬相Ａｌ２Ｏ３中,能形成有效的减磨层,从而显著降低摩擦系数和磨损因子,是一种良好的减摩抗磨自润滑材料。复合材料磨损过程主要为微剥落。     

复合尼龙粉末激光烧结过程温度场测试系统研制

对复合尼龙粉末材料激光烧结成型的加热过程进行了分析,在此基础上研制了一种适合于粉末材料激光烧结成型过程温度场的测试系统。该系统利用红外测温仪测量粉末表层温度,利用热电偶测量粉末内部温度,测量结果由计算机打印输出。根据输出结果成功进行激光烧结工艺参数优化。     

增强自润滑铸型尼龙轴瓦在螺旋输送机上的应用

增强自润滑铸型尼龙轴瓦在螺旋输送机上的应用顾铭铭上海红旗水泥厂（２０１８００）ＧＸ型螺旋输送机的中间轴靠吊瓦座悬挂和定位，轴瓦大多采用铸造青铜加工而成，磨损快，使设备运转率降低，维修费用增加。１９９４年１月，我厂试用了由张家港市东莱西闸纺织配件厂研制...     

化学复合镀的研究现状及镀层的应用

化学复合镀层因复合粒子的性能特点而广泛应用本文就国内外化学复合镀的研究现状和发展趋势进行了综述具体从硬度、耐磨性、自润滑性方面对各种Ni-P基、Ni-B基化学复合镀的工艺研究及镀层结构与性能特点进行了阐述,并认为目前关于化学复合镀的研究仍然集中在耐磨和自润滑镀层方面对不同化学复合镀层的应用做了总结,并对其提出了展望。     

In situ synthesis of TiC–TiB2–hBN–SiC composites through SHS

Ceramic composite powders with novel composition were synthesized in situ by the combination of two different reactions in one step.

The high exothermicity of a reaction previously investigated for the synthesis of TiC–TiB₂ powders was exploited to carry a second low exothermic reaction for the production of hBN–SiC composites in a self-propagation regime. The overall reaction exhibited sufficient exothermicity to self-sustain till completion.

The process yielded high purity powders with tailored compositions suitable for the fabrication of ceramic and cermet materials characterized by wear resistance and self-lubricant behaviour shown by the presence of hBN intimately dispersed into the hard ceramic matrix.     

Evaluation under temperature cycling of the tribological properties of Ag-SiNx films for green tribological applications

Nowadays, one of the most important challenges in the tribology field is to avoid the excessive consumption of soft metals such as Ag at elevated temperatures through the re-design of the self-lubricant films, to achieve the long-term lubricant under the temperature-cycling environments, for widely used in real industrial applications. This paper took up this challenge to develop a novel green film, by composing nano-particles Ag into the amorphous SiN_x matrix using magnetron sputtering system, for achieving the long-term lubricant under the room temperature (RT)-500 °C temperature-cycling conditions. Results showed that the film exhibited a dual-phase of face-centered cubic (fcc) Ag and amorphous SiN_x. An excellent RT-500 °C wear-resistance performance was observed for the films with the Ag content of 1.3–9.4 at.%, whilst the film at 15.8 at.% Ag exhibited the best anti-frictional performance (COF 0.3–0.5 for RT-500 °C conditions) at the cost of wear rate. The self-lubricant tribology behaviors under the RT-500 °C cycling conditions were mainly attributed by the synergism of: (1) mechanical properties, (2) excellent high-temperature chemical stability of SiN_x matrix, and (3) the lubricant nature of Ag and its elevated temperature diffusion behaviors.     

A critical review on self-lubricating ceramic-composite cutting tools

Self-lubricating ceramic cutting tools have recently gained considerable attention as the tool wear in cutting hard-to-cut materials greatly affects the production cost, integrity of the machined surface, and productivity. In an attempt to compile the progress made in this important research area, a critical review has been performed covering a range of aspects. These include the current research trends and the need for self-lubricating ceramic tools, identification of prospective high-temperature solid lubricants and their limitations followed by a presentation of recent experimental and numerical work conducted related to self-lubricant ceramic cutting tools. Various lubrication mechanisms involved in the cutting process are also examined to identify general tribological response under various tribo-systems, which is expected to provide useful directions for the researchers and cutting industry. The current and emerging synthesis techniques are discussed in detail and compared with respect to ceramic cutting tools. Finally, some research gaps and future directions are suggested that could lead to optimum design and development of innovative self-lubricating ceramic tools.     

先进陶瓷材料快速烧结技术发展现状及趋势

快速烧结技术在节省时间和能源方面的巨大优势使其成为一直以来的研究热点。近几十年来,快速烧结技术(如火花等离子烧结、闪电烧结、选区激光烧结、感应烧结、微波烧结和传统烧结装置中的快速烧结等)的发展,使陶瓷材料的快速烧结成为可能。本文综述了近20年来先进陶瓷领域中的快速烧结技术和烧结机理,并对火花等离子烧结中直流脉冲电流和机械压力对微观结构、材料性能和烧结机理的影响进行了深入分析和总结。同时指出,快速烧结技术今后的发展一方面是对烧结机理的进一步研究并应用到先进陶瓷材料的制备中,另一方面是解决快速烧结技术工业化生产中大尺寸、大批量生产的难题。     

刚玉莫来石—ZrB_2复合材料的烧结初期动力学研究

研究了刚玉莫来石—ZrB2复合材料烧结初期的动力学关系，认为烧结机理服从界面扩散—体积扩散过程。阐明了ZrB2的引入对刚玉莫来石材料烧结的影响，并给出了复合材料的烧结活化能Q。     

MgO-SiC复合材料烧结初期动力学研究

研究了MgO -SiC复合材料烧结初期的动力学关系 ,结果表明材料的烧结机理服从体积扩散过程。探讨了SiC的加入对MgO材料烧结的影响 ,求出了复合材料的烧结活化能。     

A review of two-step sintering for ceramics

The development of high-density ceramic materials with fine-grained microstructures has been studied to considerably improve their properties for high-performance applications. Many alternatives have been searched to refine their microstructure by changing their composition and/or processing. Among such alternatives, the densification of ceramic materials by sintering curve control is an effective, simple and economical microstructure refinement method. Thus, different thermal treatment techniques such as spark plasma sintering and microstructural forms of control such as the control of sintering conditions have been used to obtain nanostructured materials. One of the techniques widely used in recent years is two-step sintering. Two-step sintering (TSS) is a promising method used to obtain high-density bodies and smaller grain sizes. Two TSS methodologies are known: sintering with thermal pretreatment at a low sintering temperature, followed by a second stage at elevated temperature, and the more recent approach presented by Chen and Wang, which has been the most widely used. In addition to the sintering conditions (temperature, heating rate and sintering holding times) that must be suitable for each composition type, the starting materials, particle size and processing method may influence the obtained microstructure, especially the reduced grain size and increased densification. The current review of two-step sintering presents the effect of this technique on the grain density and sizes of different ceramic materials. The influence of the addition of doping agents and its effect on the mechanical properties in different systems is also presented in the current study.     

Laser sintering of carbon nanotube-reinforced ceramic nanocomposites

The fabrication of carbon nanotube (CNT)-reinforced ceramic nanocomposites through laser sintering has been rarely studied, and the fabrication feasibility has been rarely tested. Laser sintering is a flexible, localized and high-precision process, which can also potentially produce coatings or parts with complicated shapes and/or spatially controlled compositions. Therefore, compared with other technologies laser sintering has its own advantages. Experimental investigations reported in this paper have confirmed the feasibility of fabricating CNT-reinforced ceramic nanocomposites through laser sintering of ceramic nanoparticles and CNTs. The studies show that laser sintering can induce the agglomeration of ceramic nanoparticles into a relatively more continuous ceramic phase, and during the sintering process CNTs are well preserved without any obvious quality degradation, and they are also bonded with the ceramic phase after laser sintering.     

Effect of Weight Loss on Liquid-Phase-Sintered Silicon Carbide

The evaporation of silicon carbide (SiC) ceramics during sintering has been studied by thermogravimetry in a graphite furnace filled with argon. The SiC powder compacts contained 7.5 wt% eutectic composition of Y₂O₃–Al₂O₃ to promote liquid-phase sintering. A weight loss of 1–11 wt% was observed during sintering, depending on the sintering temperature and sintering time. The weight loss severely influenced the final density and the microstructure of the SiC ceramics. Particularly, the oxide sintering aids, which were homogeneously distributed in the green ceramics, were observed to segregate and form particular patterns that were dependent on the temperature, sintering time, and the total weight loss. Possible heterogeneous reactions evolving volatile species have been discussed in relation to the experimental observations.