ABSTRACT

The spark plasma sintering behavior of the alumina ceramic composite that is modified by the spatial distribution of electrically semi-conductive sub-micron scale titanium carbide particles was investigated. Titanium Carbide was reinforced to the alumina composites in different weight percent concentrations of 20, 25, 30, and 35. The influence of titanium carbide particle distribution on the thermal profile, micro-hardness, and wear resistance of alumina ceramic composites was studied. Homogenous spatial distribution of sub-micron scale semi-conductive titanium carbide particles in the composite were noticed through scanning electron microscopy, excluding the 35 weight percent sintered sample. In the spark plasma sintering processed samples, X-ray diffraction results revealed strong α-alumina and titanium carbide peaks. The obtained experimental results show that a higher titanium carbide concentration causes an earlier onset of shrinkage temperature, which positively impacts densification. The addition of titanium carbide particles accelerates the sintering kinetics and improves the properties. Among all composites, the sample with 30 weight percent has the highest relative density of 98.80% and hardness of 20.56 GPa. Besides, the highly densified sample of 30 weight percent has superior wear resistance to all other composites, and can be used for high-temperature sliding applications.

摘要

研究了由导电亚微米级碳化钛颗粒空间分布修饰的氧化铝陶瓷复合材料的放电等离子烧结行为。碳化钛以 20、25、30 和 35 的不同重量百分比浓度对氧化铝复合材料进行了增强。研究了碳化钛颗粒分布对氧化铝陶瓷复合材料的热剖面、显微硬度和耐磨性的影响。通过扫描电子显微镜观察到复合材料中亚微米级半导体碳化钛颗粒的空间分布均匀，不包括重量百分比为 35 的烧结样品。在放电等离子烧结处理的样品中，X 射线衍射结果显示出强烈的 α-氧化铝和碳化钛峰。获得的实验结果表明，较高的碳化钛浓度导致较早开始的收缩温度，这对致密化产生积极影响。碳化钛颗粒的加入加速了烧结动力学并改善了性能。在所有复合材料中，重量百分比为 30 的样品的相对密度最高，为 98.80%，硬度为 20.56 GPa。此外，30%（重量）的高致密样品比所有其他复合材料具有优越的耐磨性，可用于高温滑动应用。重量百分比为30%的样品相对密度最高，为98.80%，硬度为20.56 GPa。此外，30%（重量）的高致密样品比所有其他复合材料具有优越的耐磨性，可用于高温滑动应用。重量百分比为30%的样品相对密度最高，为98.80%，硬度为20.56 GPa。此外，30%（重量）的高致密样品比所有其他复合材料具有优越的耐磨性，可用于高温滑动应用。