铁基合金助剂制备金刚石复合片结构及物性研究

Research on structure and physical properties of PDC prepared by the iron-based alloy as additive

在高温高压条件下(5.6GPa,1400℃),以Fe55Ni26Co19合金(KOV)为烧结助剂,采用高压熔渗技术制备了生长型金刚石复合片(PDC)。采用SEM、XRD、EDS等观察了PDC的组织形貌、物相成分;Ra-man光谱计算了金刚石的残余应力;测试了金刚石烧结体的耐磨性及耐热性。实验结果表明,KOV均匀渗透金刚石层,与金刚石颗粒形成了致密交错的网状结构,PDC结合界面复合牢固;PDC物相包括金刚石、WC、CoCx、α-Co、FeNi等;PDC烧结体的磨耗比为2.8×104,热失重温度为800℃,且具有较小的残余压应力,数值为0.08GPa。

Abstract：Under the conditions of high temperature and high pressure （5. 6 GPa, 1400℃）, the growth-type polycrystalline diamond compact （PDC） was prepared by high-pressure infiltration technology using Fe55Ni26Co19 alloy （KOV） as sintering additive. The SEM, XRD and EDS were used to investigate the morphol- ogy and phase composition of PDC; the Raman spectrum was used to calculate the residual stress of the dia- monds; the wear and heat resistance of the diamond sintered body were tested. The experimental results show that the KOV evenly penetrated the diamond layer to form the dense interleaved reticular structure with the dia- mond particles, and the interface of PDC composite bonded firmly; the PDC phases include： diamond, WC, CoCx ,α-Co and FeNi; the abrasion ratio of the PDC sintered body was 2.8 × 10^4 ,and its weight loss temperature was 800℃. The PDC has a smaller residual compressive stress with the value of 0.08GPa.