摘要
采用放电等离子烧结技术制备了WC质量分数为40%的WC/Fe复合材料,研究了不同烧结温度条件下WC/Fe复合材料的致密度、组织、硬度及干摩擦磨损性能。利用SEM和XRD分析了不同烧结温度条件下存在的物相;采用销-盘摩擦磨损试验机(盘试样选用~80μm的Al2O3砂纸,滑动距离约为950m)测量了马氏体耐磨钢和WC/Fe复合材料在不同载荷下相对磨损率;用SEM观察磨损形貌,确定WC/Fe复合材料的磨损机制。结果表明:烧结温度为1080℃时,WC/Fe复合材料实现完全致密,WC陶瓷颗粒均匀分布在基体中并与基体界面结合良好;随着WC/Fe复合材料完全致密化,其硬度及耐磨性能逐渐提高;WC/Fe复合材料的耐磨性能远优于马氏体耐磨钢。WC/Fe复合材料磨损机制主要为氧化磨损和磨粒磨损。在低载荷条件下,颗粒脱离基体造成氧化膜破裂,促使材料表面受损;较高载荷条件下,WC陶瓷颗粒破碎加速氧化膜破裂,加快了材料的磨损。
The WC particles reinforced Fe matrix composites were fabricated by spark plasma sintering （SPS） with the WC particle mass friction of approximately 40 %. The influence of sintering temperature on the density, micro- structure and mechanical properties of friction and wear properties of the WC/Fe composites were investigated. The phases of WC/Fe composites under different sintering temperatures were analyzed by XRD and SEM. The worn sur- face morphologeies of the two kinds of samples were observed by SEM and the wear mechanisms of samples were de termined. The specific wear rates of the WC/Fe composites and matensitic wear-resistant steel were measured on a pin-disc tester （the counter face was a grade -80 9m Al2O3 abrasive paper）. As the results, the complete densified WC/Fe composites can be obtained under 1080℃ and a homogenous distribution of WC particles within the Fe ma- trix with good interfacial bonding is obtained. The hardness and wear resistance of the WC/Fe composites increase gradually with the composites fully densification. The wear resistant performance of WC/Fe composites is far better than that of matensitic wear-resistant steel. The main wear mechanism of the matensitic wear-resistant steel is plough wear, and that of WC/Fe composites is oxidation wear and abrasive wear. Under low load condition, oxide film rupture is caused by particles break away from the substrate and lead to the worn surface; Under high load con- dition, brittle WC ceramics accelerate oxidation film broken, which lead to speed up the loss of WC/Fe composites.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2017年第10期2288-2295,共8页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51301018)
