Co/Ni比对93W-Co-Ni钨合金烧结温度及力学性能的影响 |
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引用本文: | 王占锋,;罗崇玲,;彭媛,;郑军,;黄演忠. Co/Ni比对93W-Co-Ni钨合金烧结温度及力学性能的影响[J]. 中国钨业, 2014, 0(3): 21-24 |
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作者姓名: | 王占锋, 罗崇玲, 彭媛, 郑军, 黄演忠 |
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作者单位: | [1]中国兵器工业集团西安华山钨制品有限公司,陕西西安710043; [2]崇义章源钨业股份有限公司,江西赣州341300 |
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基金项目: | 西安市科技局的企业技术创新工程资助项目(CX1266) |
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摘 要: | 以Co、Ni作黏结剂,选择不同Co/Ni比,用粉末冶金法制备出HRC硬度在3043之间的93W-Co-Ni钨合金。采用光学金相、扫描电镜对合金组织形貌进行表征,采用准静态拉伸试验对合金的抗拉强度及延伸率进行测试,采用洛氏硬度计对合金硬度进行测定。结果表明:随着Co/Ni比增加,合金的烧结温度逐渐增加,其抗拉强度与延伸率急剧降低,而硬度先增加之后趋于稳定;当Co/Ni≥1.0时,合金抗拉强度很低,延伸率≤1%;当Co/Ni≥4时,其HRC硬度值稳定在4143之间的93W-Co-Ni钨合金。采用光学金相、扫描电镜对合金组织形貌进行表征,采用准静态拉伸试验对合金的抗拉强度及延伸率进行测试,采用洛氏硬度计对合金硬度进行测定。结果表明:随着Co/Ni比增加,合金的烧结温度逐渐增加,其抗拉强度与延伸率急剧降低,而硬度先增加之后趋于稳定;当Co/Ni≥1.0时,合金抗拉强度很低,延伸率≤1%;当Co/Ni≥4时,其HRC硬度值稳定在4143之间,明显高于一般的W-Ni-Fe合金,这主要与Co对W基体的润湿性较差及两者之间易形成脆性化合物Co7W6有关。
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关 键 词: | Co/Ni比 钨合金 硬度 烧结温度 抗拉强度 延伸率 |
Influence of Co/Ni Ratio on Sintering Temperature and Mechanical Properties of 93W-Co-Ni Tungsten Heavy Alloy |
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Affiliation: | WANG Zhan-feng, LUO Chong-ling, PENG Yuan, ZHENG Jun, HUANG Yan-zhong (1.China North Industries Group Xi'an Huashan Tungsten Products Co., Ltd,Xi'an 710043,Shaanxi,China; 2.Chongyi Zhangyuan Tungsten Co., Ltd, Ganzhou 341300, Jiangxi, China) |
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Abstract: | 93W-Co-Ni tungsten heavy alloys with HRC hardness of 30-43 were prepared by means of powder metallurgy with different Co/Ni ratio as binding admixture. Optical microscope (OM),scanning electricity microscope (SEM)were used to characterize microstructure of alloys, respectively. The tensile strength and elongation of alloys were tested with quasi-static tensile testing machine, and the hardness was tested by a Rockwell hardness tester. The results indicate that with increasing Co/Ni ratio the sintering temperature gradually raises, the tensile strength and elongation rapidly decrease, respectively. Meanwhile, the hardness first increases and then becomes stable. When the Co/Ni ratio exceeds 1.0 the tensile strength is lower, the elongation is less than or equal to 1%. As the Co/Ni ratio exceeds 4.0 the hardness range is from 41 to 43,which is significantly higher than that of general W-Ni-Fe alloy. The mechanical properties of 93W-Co-Ni tungsten heavy alloy are found mainly dependent on the lack of soakage property of the Co to W base and formation of intermetallic phase Co 7W6. |
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Keywords: | Co/Ni ratio tungsten heavy alloy hardness sintering temperature tensile strength elongation |
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