粉末注射成型金刚石制品的溶剂-热脱脂工艺  

Solvent-Thermal Debinding Process of Diamond Products by Powder Injection Molding

作　　者：伍俏平[1] 邓朝晖[1] 潘占[2] 万林林[1] 康辉民[1] 

机构地区：[1]湖南科技大学机电工程学院,湖南湘潭411201 [2]湖南大学,国家高效磨削工程技术研究中心,长沙410082

出　　处：《硅酸盐学报》2012年第12期1786-1791,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51205126,50775069)项目;湖南省自然科学基金青年人才联合培养项目(12JJB006)资助

摘　　要：利用粉末注射成型技术对金刚石/铜基钎料粉末进行了注射成型实验,制备出了小型金刚石制品。采用溶剂–热脱脂二步脱脂工艺对金刚石制品进行脱脂处理。分析了溶剂脱脂过程中脱脂温度及脱脂时间对脱脂率的影响规律;利用扫描电子显微镜观测了不同溶剂脱脂时间下微观孔隙形成情况;考察了分别在H2和N2气氛下热脱脂效果。结果表明:采用正庚烷为脱脂溶剂时,溶剂脱脂温度越高、脱脂时间越长,溶剂脱脂率越大,在35℃脱脂2.5 h后,脱脂率达到了92.1%,金刚石制品形成了大量的连通孔隙。在600℃保温60 min热脱脂后,金刚石制品中的黏结剂已全部脱除,制品中未发现鼓泡、开裂、塌陷等缺陷,脱脂效果良好。在热脱脂过程中,H2气氛脱脂相对于N2气氛脱脂碳含量增大了0.05%,氧含量减少了0.13%,在H2中脱脂更利于后续烧结过程中金刚石制品的有效烧结。The small diamond molded parts were prepared via a powder injection molding technology of diamond/copper-based brazing powder. A solvent-thermal debinding process was selected to remove the binder from the diamond molded parts. The effects of the debinding temperature and time on the debinding rate were discussed, and the morphological structure was analyzed by scanning electron microscope in solvent debinding. The thermal debinding effect was investigated in H2 and N2 atmosphere, respectively. The results show that the debinding rate increases with increasing the debinding temperature and time when the solvent is heptane. The binder of 92.1% in the parts was removed at 35 ℃ for 2.5h, favoring the generation of the pore channels inside the parts. When the parts were heated to 600 ℃ and held for 60 rain during the thermal debinding, the binder was removed, and little faults such as bubbling, cracking and collapsing were no found in the parts. Compared to N2 atmosphere, the residual carbon was increased by 0.05% and oxygen content was decreased by 0.13% at H2 atmosphere, leading to the improvement of the wettability and the bond strength between diamonds and alloy in the sintering.

关 键 词：金刚石制品 粉末注射成型 溶剂脱脂 热脱脂 

分 类 号：TG146.2[一般工业技术—材料科学与工程]