周成,王海滨,王西龙,马捷,宋晓艳.纯相低氧纳米WC-Co复合粉的制备[J].稀有金属材料与工程,2017,46(12):3887~3892.[Zhou Cheng,Wang Haibin,Wang Xilong,Ma Jie,Song Xiaoyan.Preparation of nano WC-Co composite powders with pure phases and low oxygen content[J].Rare Metal Materials and Engineering,2017,46(12):3887~3892.]
纯相低氧纳米WC-Co复合粉的制备
投稿时间:2015-09-22  修订日期:2015-10-21
中文关键词:  原位合成  纳米WC-Co复合粉  吸附氧  放电等离子烧结
基金项目:863计划主题项目(项目号2013AA032001),国家自然科学基金(项目号51174009),北京市自然科学基金(项目号213001)
中文摘要:
      以紫钨、四氧化三钴、炭黑为原料,在高真空度条件下利用原位反应合成技术制备出物相纯净、粒径约为80nm的WC-Co复合粉。研究了制备工艺参数对纳米复合粉相组成、粒径、氧含量及最终烧结硬质合金块体材料组织性能的影响。结果表明,纳米复合粉中氧含量较高时,会导致后续烧结过程中发生脱碳反应,使烧结制备的块体材料致密度和力学性能明显下降。将纳米复合粉在800oC下真空热处理2.5h可有效降低粉末中的氧含量,同时热处理后的粉末颗粒无明显长大,平均粒径为85nm。向复合粉中加入1.1%TiC与0.9%VC进行SPS烧结,烧结块体平均晶粒尺寸为105nm,且尺寸分布均匀,致密度达99%以上,硬度为2145HV30,断裂韧性达到9.81MPa*m1/2
Preparation of nano WC-Co composite powders with pure phases and low oxygen content
英文关键词:in-situ reduction and carburization  nano WC-Co composite powder  absorbed oxygen  spark plasma sintering
英文摘要:
      Using tungsten oxide, cobalt oxide and carbon black as the raw materials. The nano WC-Co composite powders with pure phases was synthesized by in-situ reduction and carburization reactions. The particle size of prepared WC-Co composite powders is about 80 nm. In this work, the effects of preparation conditions on the phase formation, particle size and oxygen content of the composite powders and on the microstructure and mechanical property of the sintered bulk were investigated. The results indicate that the decarburization reaction will happen in the process of sintering when the oxygen content of the composite powders is higher, leading to a decrease in density and mechanical property of the sintered bulk. The oxygen content declines significantly, with heat treated for two and a half hours, under the heat treatment temperature of 800 oC. Meanwhile, the mean particle size with heat-treated is 85 nm, without markedly increase. Using heat-treated composite powders with the addition of 1.1%TiC and 0.9%VC grain growth inhibitors, the nano-grained WC-Co bulk by SPS was obtained, with an average grain size of 105nm. The hardness values and fracture toughness obtained are 2145Hv30 and 9.81MPam1/2 , superior to unheated sample.
作者单位E-mail
周成 北京工业大学材料科学与工程学院 olivezhoucheng@qq.com 
王海滨 北京工业大学材料科学与工程学院  
王西龙 北京工业大学材料科学与工程学院  
马捷 北京工业大学材料科学与工程学院 majie@bjut.edu.cn 
宋晓艳 北京工业大学材料科学与工程学院 xysong@bjut.edu.cn 
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