钴的脱除工艺对聚晶金刚石复合片性能的影响  

Effect of Cobalt Removal Process on Properties of Polycrystalline Diamond Compacts

作　　者：陈卫民 李磊 刘杰 邢波 杨馨蕊 罗丽萍 孙福华 Chen Weimin;Li Lei;Liu Jie;Xing Bo;Yang Xinrui;Luo Liping;Sun Fuhua(Liaocheng Changrun Composite Materials Co.,Ltd.Liaocheng Shandong 252000,China;School of Chemical Engineering,Sichuan University of Science and Engineering,Zigong Sichuan 643000,China)

机构地区：[1]聊城市昌润复合材料有限公司,山东聊城252000 [2]四川轻化工大学化工学院,四川自贡643000

出　　处：《硬质合金》2023年第4期271-278,共8页Cemented Carbides

基　　金：四川轻化工大学横向课题基金(E10204552)。

摘　　要：聚晶金刚石复合片(PDC)是一种用于油气钻采、矿物开采的超硬复合材料,需要通过脱除金刚石层中的钴来提高耐磨性和抗冲击性能。本文以盐酸、硫酸和路易斯酸(FeCl3)作为脱钴试剂,使用加压化学沉淀法对金刚石复合片进行脱钴,研究脱钴试剂的原料配比、脱钴反应压力、脱钴反应时间对金刚石复合片脱钴效率及性能的影响。结果表明,使用加压化学沉淀法可以高效脱除PDC中的钴。将1片PDC和60 mL脱钴试剂进行反应,脱钴试剂中HCl浓度为6 mol/L,硫酸加入量为60 mL/L、路易斯酸加入量为50 g/L,反应温度为160℃,反应压力控制在0.8 MPa为最优脱钴工艺条件,反应时间72 h,脱钴深度可达580μm,达到了1.2 mm金刚石复合片脱钴要求(脱钴深度>0.5 mm)。使用加压化学沉淀法比常规酸浸出法脱钴效率更高,脱钴后金刚石复合片耐磨性更高,抗冲击韧性更好。Polycrystalline diamond compact(PDC)is a kind of super hard composite material for oil and gas drilling and mineral mining.It needs to remove cobalt in the diamond layer to improve wear resistance and impact resistance.In this paper,hydrochloric acid,sulfuric acid,and Lewis acid(FeCl3)were used as cobalt removal reagents,and the pressurized chemical precipitation method was used to remove cobalt in the PDC.The effects of raw material ratio,reaction pressure,and reaction time of cobalt removal reagents on the cobalt removal efficiency and properties of the PDC were studied.The results show that the cobalt in the PDC can be efficiently removed by the pressure chemical precipitation method.The PDC reacted with the cobalt removal reagent of 60 mL.The HCl concentration in the cobalt removal reagent was 6 mol/L;sulfuric acid dosage was 60 ml/L;Lewis acid dosage was 50 g/L;the reaction temperature was 160℃,and the reaction pressure was controlled at 0.8 MPa,which were the optimal cobalt removal conditions.Under these conditions,the cobalt removal depth reached 580μm after 72 h,which met the 1.2 mm cobalt removal requirement of the PDC(cobalt removal depth>0.5 mm).The cobalt removal efficiency of the pressurized chemical precipitation method was higher than that of the conventional acid leaching method.After cobalt removal,the wear resistance of the PDC was higher,and the impact toughness was better.

关 键 词：聚晶金刚石复合片 脱钴 加压化学沉淀法 磨耗比 抗冲击性 

分 类 号：TB33[一般工业技术—材料科学与工程]