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.
出处
《北京工业大学学报》
CAS
CSCD
北大核心
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)
关键词
原位反应
WC-10%
Co复合粉
预烧结
低压烧结
力学性能
in-situ reaction
WC-10% Co composite powder
pre-sintering
sinter-hot isostatic pressing（sinter-HIP）
mechanical properties
