硅酸钙陶瓷的SPS烧结及其力学性能  

SPS Fabrication and Mechanical Properties of β-CaSiO_3

作　　者：赵嵩珏[1,2] 王连军 江莞 陈立东 

机构地区：[1]上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室 [2]中国科学院研究生院,北京100049

出　　处：《稀有金属材料与工程》2007年第A01期354-356,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50372078);国家杰出青年基金(50625414)

摘　　要：以硝酸钙和硅酸钠为原料,采用化学共沉淀法合成了适合作为生物材料的硅酸钙粉体,并利用放电等离子体烧结工艺(Spark Plasma Sintoring)烧结硅酸钙陶瓷(常温相为β相)。为了探讨合适的烧结工艺参数,分别采用了不同的烧结温度(850～1000℃),不同的保温时间(1-10min)和不同的加载压力(20～50MPa)进行烧结。测了这一系列不同烧结工艺参数下得到的块体的抗弯强度、硬度、断裂韧性等力学性能。结果表明,在950℃可以制得很致密的硅酸钙材料,其力学性能比其它方法得到的材料大为提高。延长保温时间及增加烧结压力,抗弯强度和硬度均在一定范围内增加,而断裂韧性则呈现相反趋势,因此,要根据材料的应用需要来确定最佳工艺参数。Dense β-CaSiO3 （low temperature phase） ceramics were fabricated by spark plasma sintering （SPS）, β-CaSiO3 powder were synthesized by chemically precipitated using NaSiO3·9H2O and Ca（NO3）·4H2O as raw material. We changed the three sintering parameters, them are respectively sintering temperature, sintering pressure and holding time to prepare several different samples and measured their mechanical properties. The results show that the mechanical properties of β-CaSiO3 ceramics prepared at 950 β were great promoted. When increasing the sintering pressure or holding time, flexural strength and Vickers hardness increase but the fracture toughness decreases. As the mutative trend of flexural strength and fracture toughness are inconsistent, the sintering parameter should be adjusted according to practical need.

关 键 词：硅酸钙 SPS 力学性能 

分 类 号：TF124.5[冶金工程—粉末冶金]