预烧结对低压烧结WC-Co硬质合金组织和性能的影响  

Effect of Pre-sintering on Microstructure and Properties of Cemented Carbides Sintered by Sinter-HIP

作　　者：宋晓艳[1] 付军[1] 魏崇斌[1] 王海滨[1] 刘雪梅[1] 

机构地区：[1]北京工业大学材料科学与工程学院新型功能材料教育部重点实验室,北京100124

出　　处：《北京工业大学学报》2014年第6期916-921,共6页Journal of Beijing University of Technology

基　　金：国家"863"计划资助项目(SS2013AA031401);国家自然科学基金资助项目(51174009)

摘　　要：采用原位还原碳化反应制备超细WC-10%Co,在1250、1300、1350、1380℃进行预烧结处理,得到的预烧结块体在1450℃、5 MPa氩气条件下进行低压二次烧结;分析对比了预烧结块体和二次烧结块体的显微组织,并对二次烧结合金进行了性能测试.结果表明:不同温度预烧结块体经低压二次烧结后,可有效抑制晶粒异常长大现象,二次烧结后合金具有高的断裂韧性,最高值达16.1MPa·m-1/2.在1 350、1 380℃下预烧结块体经低压二次烧结后均具有均匀的合金组织,其中经过1380℃预烧结块体横向断裂强度为3260 MPa.In the present work, the in-situ synthesized uhrafine WC-Co composite powder was presintered at 1 250, 1 300, 1 350, and 1 380 ℃ , respectively. Then, the pre-sintered solids were sintered by the hot isostatic pressing （sinter-HIP） at 1 450℃ for 30 min in the Ar atmosphere with gas pressure of 5 MPa. Microstructures and mechanical properties of the pre-sintered solid and finally sintered bulks were investigated, respectively. Results show that the pre-sintering process can effectively control the abnormal grain growth. After pre-sintering treatment, the bulk materials prepared by sinter-HIP have excellent fracture toughness, with the maximum value of 16. 1 MPa·m^-1/2. The composite powder pre-sintered at 1 350 ℃ and 1 380℃ , sintered by HIP, has more homogeneous microstructure and high transverse rupture strength.

关 键 词：原位反应 WC-10% Co复合粉 预烧结 低压烧结 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]