SiC-B₄C ceramic composites with different ratios of SiC to B₄C were produced. The relative density, mechanical properties, initial surface characteristics, dry sliding tribological properties against SiC ball and worn surface characteristics of the SiC-B₄C ceramics were studied. Results of dry sliding tribological tests showed that, 40 wt. % SiC-60 wt. % B₄C ceramic composite had the best tribological properties in SiC-B₄C ceramic composites. A relief structure with height difference of 10−30 nm between B₄C grains and SiC grains is formed after dry sliding. This relief structure, on the one hand, can reduce real contact area on interface, decreasing adhesion effect, and on the other hand, can fix or trap the wear pieces formed on sliding interface during the dry sliding process, reducing the abrasive wear. However, there is a limit to the beneficial influence of decreased adhesion effect and reduced abrasive wear, and an optimum proportion of relief structure. Pores can also fix or trap some wear pieces, reducing the abrasive wear. Under the condition of strong bonding between SiC grains and B₄C grains, the SiC-B₄C ceramic composites with higher porosity can obtain better tribological properties. In addition, it is observed by AFM that the depth of scratch on B₄C grains is shallower than that on SiC grains. Hence, it is demonstrated by micro scale measurement that the wear rate of B₄C is lower than that of SiC in this study.

制备了SiC与B ₄ C比例不同的SiC-B ₄ C陶瓷复合材料。研究了SiC-B ₄ C陶瓷的相对密度，力学性能，初始表面特性，对SiC球的干滑动摩擦性能和磨损表面特性。干式滑动摩擦学测试的结果表明，40 wt。SiC-60重量％在SiC-B ₄ C陶瓷复合材料中，％B ₄ C陶瓷复合材料具有最佳的摩擦学性能。B ₄之间的高度差为10-30 nm的浮雕结构干滑后会形成C晶粒和SiC晶粒。这种浮雕结构一方面可以减小在界面上的实际接触面积，降低粘附效果，另一方面可以在干式滑动过程中固定或捕获在滑动界面上形成的磨损件，从而减少磨料磨损。但是，对于减小粘附效果和减少磨料磨损以及最佳比例的凸纹结构的有益影响是有限的。毛孔还可以固定或捕获一些磨损件，从而减少磨料磨损。在SiC晶粒与B ₄ C晶粒之间牢固结合的条件下，具有较高孔隙率的SiC-B ₄ C陶瓷复合材料可以获得更好的摩擦学性能。另外，通过AFM观察到在B ₄上的划痕深度。C晶粒比SiC晶粒浅。因此，在本研究中，通过微量测量表明，B ₄ C的磨损率低于SiC。