多元合金-碳化物粘结相对金刚石复合材料组织的影响  

Effect of multi-element alloy-carbide bonding phase on the microstructure of diamond composites

作　　者：邱天旭 张伟[1] 刘咏[1] QIU Tianxu;ZHANG Wei;LIU Yong(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《复合材料学报》2023年第7期4173-4183,共11页Acta Materiae Compositae Sinica

基　　金：国家重点研发计划重点专项(2021 YFB3701800);国家自然科学基金区域创新发展联合基金(U20 A20236)~~。

摘　　要：金刚石复合材料在加工、钻探等领域应用广泛,提高材料中金刚石骨架的结合强度是重要研究方向。以Co_(50)Ni_(40)Fe_(10)多元合金-碳化物替代纯Co作为粘结相,在高温高压条件下制备了金刚石复合材料,结合热力学计算研究了多元合金和碳化物对材料组织的影响。结果表明:相比于Co,Co_(50)Ni_(40)Fe_(10)多元合金具有更强的促进C原子迁移和扩散的能力,能加快金刚石骨架的形成。高温高压条件下,WC中C含量轻微增加,对金刚石骨架的形成影响不大;TiC轻微失C,能在一定程度上促进金刚石骨架的形成;Cr_3C_2分解产生的C能促进金刚石骨架的形成。Diamond composites are widely used in processing,drilling and other fields,and improving the bonding strength of the diamond skeleton is an important research direction.In this work,Co50Ni40Fe10 multi-element alloycarbide was used as the binder instead of Co to prepare diamond composites under high temperature and high pressure,and the influence of multi-element alloys and carbides on the microstructure of composites was studied by experiments and thermodynamic calculations.The results show that,compared with Co,Co50Ni40Fe10 multi-element alloy has stronger ability to promote the migration and diffusion of C atoms,which can accelerate the formation of diamond skeleton.Under the condition of high temperature and high pressure,the carbon content in WC increased slightly,which has little effect on the formation of diamond skeleton;TiC lost C slightly,which can promote the formation of diamond skeleton to a certain extent;The C produced by Cr3C2 decomposition can promote the formation of diamond skeleton.

关 键 词：多元合金 碳化物 热力学 聚晶金刚石 金刚石骨架 

分 类 号：TB333[一般工业技术—材料科学与工程]