无压烧结碳化硼中Y_(2)O_(3)和Al_(2)O_(3)助剂的助扩散机制研究  

The Compare of Diffusion Process of Pressureless-Sintered Boron Carbide Using Y_(2)O_(3)and Al_(2)O_(3) as Sintering Additives

作　　者：彭立志[1] 姜宏伟[1] 郑友进[1] 王丹[1] 黄海亮[1] PENG li-zhi;JIANG Hong-wei;ZHENG You-jin;WANG Dan;HUANG Hai-Liang(Mudanjiang NormAl College Heilongjiang Key laboratory of New Carbon-base FunctionAl and Superhard MateriAl,Mudanjiang,157011)

机构地区：[1]牡丹江师范学院新型炭基功能与超硬材料省重点实验室,牡丹江157011

出　　处：《佛山陶瓷》2023年第1期14-17,共4页Foshan Ceramics

摘　　要：采用无压烧结工艺,添加质量分数9.5%的Y_(2)O_(3)作为烧结助剂,进行了碳化硼陶瓷的2100℃、2200℃和2250℃烧结2h实验,对样品进行了体积密度、显气孔率、维氏硬度、表面形貌和晶体结构测试,并与纯碳化硼2250℃烧结的样品进行了比较。实验表明,添加Y_(2)O_(3)助剂2250℃烧结2h的样品的体积密度、气孔率、硬度指标比纯碳化硼粉2250℃烧结2h的样品有较大幅度提升;在碳化硼晶粒扩散时,Y_(2)O_(3)助剂和碳化硼晶粒协同扩散,使碳化硼晶粒趋向于致密化烧结;Y_(2)O_(3)助剂的介入使碳化硼晶粒生长(运动)机制发生了变化。The effect of 9.5%Y_(2)O_(3)additions on the sintering behavior of B_(4)C were studied using pressureless sintering method,boron carbide ceramics were obtained at 2100℃,2200℃,2250℃,and sintering time was 2h.Volume density,open porosity,micro-hardness,surface morphology and crystal structure were measurement and compared with the pure boron carbide samples sintered at 2250℃.The results revealled that the Y_(2)O_(3)additions can cooperate with B4C,this diffusion behavior bring about sintering densification.

关 键 词：Y_(2)O_(3) 助剂 协同扩散 碳化硼 无压烧结 

分 类 号：TQ174.1[化学工程—陶瓷工业]