Co含量对金刚石–WC–Co复合材料耐磨性的影响

Effect of Co content on the wear resistance of diamond-WC-Co composites

摘要:

随着采矿和城市基建等行业的发展,对矿用WC–Co采掘工具的耐磨性提出了更高的要求。通过添加金刚石增强WC–Co矿用工具的耐磨性是一种可行的新思路。在烧结制备金刚石–WC–Co复合材料的过程中钴相作为催化剂会加速金刚石向石墨转变。为研究Co对复合材料中金刚石石墨化程度的影响,采用放电等离子体烧结技术(SPS)制备金刚石–WC–Co复合材料,分析了复合材料中金刚石石墨化程度并采用砂轮法研究了复合材料的磨损性能和磨损机理。结果表明：金刚石–WC–Co复合材料中金刚石可以起到增韧效果；Co含量增加会促进复合材料致密化进程,同时也会降低复合材料的硬度；随着Co含量增加,复合材料材料耐磨性变差。磨损过程中 WC–Co基体率先被磨损去除,金刚石后被磨损,金刚石会增强材料的耐磨性能。

关键词:放电等离子体烧结(SPS);金刚石–WC–Co复合材料;磨损性能;

Abstract:

With the development of industries such as mining and urban infrastructure construction, higher requirements have been put forward for the wear resistance of mining WC-Co mining tools. It is a feasible new idea to enhance the wear resistance of WC-Co mining tools by adding diamonds. In the process of sintering the diamond-WC-Co composites, the cobalt phase acts as a catalyst to accelerate the conversion of diamond to graphite. In order to study the influence of Co on the degree of graphitization of diamond in composites, spark plasma sintering (SPS) was used to prepare diamond-WC-Co composites, the degree of diamond graphitization in composites was analyzed, and the grinding wheel method was used to study the wear performance and wear mechanism of the composites. The research indicates that diamond in the diamond-WC-Co composites can play a toughening effect; Increasing Co content will promote the densification process of the composites while reducing the hardness of the composites; As the Co content increases, the wear resistance of the composites becomes worse. During the experiment, the WC-Co matrix was first removed by abrasion, and then the diamond was worn. Diamond will enhance the wear resistance of the composites.

Key words:Spark plasma sintering (SPS); diamond-WC-Co composites; wear performance;