绵白糖碳源反应烧结凝胶注模成型SiCw/B4C陶瓷组织与性能的研究

Study on Microstructure and Properties of SiCw/B4C Ceramics Using White Sugar as Carbon Source Reaction Sintering Gel Injection Molding

凝胶注模作为一种新型成型技术,具有成本低和净尺寸成型的优点。本文通过凝胶注模成型工艺制备SiCw/B4C复合陶瓷素坯。采用绵白糖作为碳源制备低粘度的陶瓷浆料,并加入不同质量分数的SiCw,通过反应烧结制备SiCw/B4C复合陶瓷材料。对所制备的陶瓷材料的显微组织和力学性能进行研究。结果表明:绵白糖的加入降低了陶瓷浆料粘度并提高素坯抗弯强度,但是过量的绵白糖会对素坯结构造成破坏。SiCw加入有助于复合陶瓷材料力学性能的提高;当SiCw含量为12wt%时,B4C陶瓷材料抗弯强度为201 MPa,相比未加入SiCw的B4C陶瓷材料提高了24%。

Gel casting as a new molding technology has the advantages of low cost and net dimension molding.In this paper,SiCw/B4C composite ceramic blank was prepared by gel casting process.The low viscosity ceramic slurry was prepared by using white sugar as carbon source,and SiC w with different mass fraction was added to prepare SiCw/B4C composite ceramic material by reactive sintering.The microstructures and mechanical properties of the ceramics were studied.The results show that the viscosity of ceramic slurry is reduced and the bending strength of green body is increased by adding white sugar,but the structure of green body is damaged by excessive white sugar.When the content of SiCw is 12wt%,the bending strength of B4C ceramics is 201 MPa,which is 24%higher than that of B4C ceramics without SiCw.