反应烧结碳化硅陶瓷注射成型工艺研究  

Study on Injection Molding of Reaction-Bonded Silicon Carbide

作　　者：张钊[1,2] 张玉军[1,2] 龚红宇[1,2] 李文杰 翟彦霞 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061 [2]山东大学特种功能聚集体材料教育部重点实验室,济南250061 [3]山东宝纳新材料有限公司,山东莱芜271132

出　　处：《现代技术陶瓷》2016年第1期54-61,共8页Advanced Ceramics

基　　金：国家自然科学基金资助项目(51472146)

摘　　要：以碳化硅(Si C)和炭黑(C)为原料,以石蜡(PW)、高密度聚乙烯(HDPE)、乙烯醋酸乙烯酯(EVA)为有机载体,以硬脂酸(SA)为表面改性剂,研究了反应烧结碳化硅陶瓷注射成型工艺对产品性能的影响。结果表明:在陶瓷粉体含量为80 wt%,有机载体以PW:HDPE:EVA:SA=9:3:3:1的比例,加入量为20 wt%,混炼1 h后,在100 MPa注射压力注射成坯,采用两步法脱脂,于真空烧结炉内1720°C下保温2h烧结,可获得结构致密的碳化硅陶瓷试样,其显气孔率为0.18%,密度为2.96 g/cm^3,抗弯强度达到290 MPa,断裂韧性值达到4.14MPa·m^(1/2),硬度达到21.6 GPa。Reaction-bonded silicon carbide（RBSC） was processed by injection molding（CIM） technology, using silicon carbide and carbon black as raw material, paraffin, ethylene vinyl acetate copolymer and high density polyethylene as binders, stearic acid as surfactant. The influence of CIM process on the properties of RBSC ceramics was discussed. It was indicated that the optimal feedstock consisted of 80 wt% of ceramic powder loading and 20 wt% of the organism system with PW：HDPE：EVA：SA=9：3：3：1. Mixing process was performed for one hour. Then the green body was shaped under the injection pressure of 100 MPa. A two-step debinding process was carried out. The samples after debinding was being sintered at 1780°C for 2 h in vacuum and a compact reaction bonding silicon carbide ceramic was prepared, with apparent porosity of 0.18%, density of 2.96 g/cm^3, bending strength of 290 MPa, fracture toughness of 4.14 MPa·m^（1/2） and hardness of 21.6 GPa.

关 键 词：反应烧结碳化硅 粘结剂 注射成型 脱脂 

分 类 号：TB332[一般工业技术—材料科学与工程]