微波烧结制备MAX相–金刚石复合材料

采用三元层状导电可加工陶瓷M_n+1AX_n（简称MAX相）材料粉体和金刚石粉体为原料，通过微波烧结制备以MAX相为结合剂的金刚石复合材料，研究MAX相的种类与金刚石含量对该复合材料的物相组成与显微形貌的影响。通过高温微波烧结MAX相-金刚石复合材料，金刚石表面会形成不同的涂层组织。MAX相的种类与金刚石含量对复合材料中基体组成和金刚石的表面涂层状态有显著影响。实验结果表明:在Ti₂SnC-金刚石复合材料中，烧结后Ti₂SnC会发生严重的分解，分解生成Sn与TiC，在含量较低时，表面仍然光滑，金刚石表面黏附少量富锡圆形组织；当金刚石含量较高时，金刚石表面形成许多细小TiC颗粒。在Ti₃AlC₂-金刚石复合材料中，Ti₃AlC₂分解后生成Al与TiC，金刚石的表面受到明显的侵蚀，同时在表面形成Al₄C₃和Al₂O₃二元组织。对于Ti₃SiC₂-金刚石反应体系，基体主相均为Ti₃SiC₂。当金刚石质量分数为10%时，同时还含有少量Si、TiSi₂和SiC；当金刚石质量分数为20%时，基体中还含有少量TiC，金刚石表面形成了SiC和TiSi₂二元涂层组织。 

MAX phase-diamond composites fabricated by microwave sintering

MAX ceramic bonded diamond composites were fabricated by microwave sintering from MAX phases and diamond raw powders.The effect of MAX phase and diamond content on phase and micro-structure of composites were studied.The result showed that different coating on the diamond could be obtained after microwave sintering.MAX phases'type and diamond had a different effect on the matrix composition and surface coating of diamond.Ti₂SnC might be obviously decomposed to Sn and TiC in the Ti₂SnC-diamond composites.When diamond content was lower,its surface was smoother.Additionally,small amount of circle organization were formed on the diamond.When diamond content was higher,many fine TiC grains were formed on the diamond.Ti₃AlC₂ may be also obviously decomposed to Al and TiC in the Ti₃AlC₂-diamond composites after sintering.Diamond was eroded obviously.Al₄C₃ and Al₂O₃ organization were formed on the surface of diamond.In Ti₃SiC₂-diamond system,the main phase of the matrix was Ti₃SiC₂.When diamond mass fraction was 10%,small amounts of Si,TiSi₂ and SiC were obtained.When diamond mass fraction was 20%,tiny TiC was obtained.SiC and TiSi₂ binary organization were formed on the diamond.