WC-Ni基硬质合金的光固化增材制造  

Additive Manufacturing of WC-Ni Based Cemented Carbides via Vat Photopolymerization Technology

作　　者：刘展赫 陈子航 王日初[1] 彭超群[1] 时凯华 周科朝[3] 马格达西·什洛莫 王小锋[1] LIU Zhan-he;CHEN Zi-hang;WANG Ri-chu;PENG Chao-qun;SHI Kai-hua;ZHOU Ke-chao;MAGDASSI Shlomo;WANG Xiao-feng(School of Materials Science and Engineering,Central South University,Changsha 410083,China;China-Tungsten High-Tech Materials Co.,Ltd.,Zhuzhou 412000,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Institute of Chemistry,Hebrew University of Jerusalem,Jerusalem 91904,Israel)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中钨高新材料股份有限公司,湖南株洲412000 [3]中南大学粉末冶金国家重点实验室,湖南长沙410083 [4]耶路撒冷希伯来大学化学研究所,耶路撒冷91904

出　　处：《稀有金属与硬质合金》2024年第2期76-88,共13页Rare Metals and Cemented Carbides

摘　　要：采用光固化增材制造(3D打印)技术制备WC-Ni基硬质合金,研究了浆料配比和增材制造工艺参数对浆料流变性能和固化性能的影响以及WC-Ni基硬质合金的性能。结果表明:当浆料固含量为40%(体积分数)、分散剂为ZN-1344且加入量为粉体质量的2%时,WC-Ni浆料的流变性能满足增材制造工艺需求,当剪切速率为100 s^(-1)时,浆料黏度为2.718 Pa·s;该浆料的最大单层固化厚度可达144μm,对应工艺参数为0.01 mm线间距、90%激光功率和2 000 mm/s扫描速度;采用响应曲面法拟合数据获得的浆料单层固化厚度计算模型,计算值与实际值误差为3.4%,可起理论预测作用;光固化增材制造WC-15%Ni硬质合金的密度和相对密度最高,分别为13.51 g/cm^(3)和96.5%,加入1%晶粒长大抑制剂Cr_(3)C_(2)后,硬质合金维氏硬度显著提高,达到945 HV_(30),接近同等Ni含量但不含有Cr_(3)C_(2)的传统硬质合金硬度。WC-Ni based cemented carbides were fabricated by vat photopolymerization(3D printing)technology.The influence of slurry composition and printing parameters on the rheological and curing properties of the slurry was investigated,as well as the properties of WC-Ni based cemented carbides.The results indicate that when the solid content of the slurry is 40 vol.%and ZN-1344 is chosen as the dispersant with an addition of 2%by mass of the powder,the rheological properties of the WC-Ni slurry meet the requirements of the additive manufacturing process.And the viscosity of the slurry reaches 2.718 Pa·s at a shear rate of 100 s^(-1).When the printing parameters are set to 0.01 mm hatch spacing,90%laser power,and 2000 mm/s scanning speed,the maximum single-layer curing depth of the slurry reaches 144μm.The calculation model for the single-layer curing depth of the slurry is obtained by data fitting using the response surface methodology(RSM),and the calculated value has a deviation of 3.4%compared with the actual value,demonstrating its capability of theoretical prediction.The density and relative density of WC-15%Ni cemented carbide prepared via vat photopolymerization can reach a maximum of 13.51 g/cm^(3) and 96.5%,respectively.The addition of 1 wt.%grain growth inhibitor Cr_(3)C_(2) significantly improves the Vickers hardness of the cemented carbide to 945 HV_(30),approaching the hardness of traditional cemented carbides with equivalent Ni content but without Cr_(3)C_(2).

关 键 词：WC-Ni基硬质合金 光固化增材制造 3D打印 响应曲面法 晶粒长大抑制剂 复杂结构 

分 类 号：TG135.5[一般工业技术—材料科学与工程]