Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第3期    总第204期    2016年3月

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文章编号:1004-0609(2016)-03-0577-09
金刚石工具用FeCoCu预合金粉组成对烧结特性的影响
谢德龙1,万隆1,宋冬冬1,王帅2,林峰2,吕智2, 方啸虎2,潘晓毅2,秦海青2,陈超2,肖乐银2

(1. 湖南大学材料科学与工程学院,长沙 410082;
2. 中国有色桂林矿产地质研究院广西超硬材料重点实验室,
国家特种矿物材料工程技术研究中心,桂林 541004
)

摘 要: 通过共沉淀法制备不同Fe-Cu配比的FeCoCu预合金粉,并对其微观结构进行表征与分析。同时,对3种粉体进行不同温度下的烧结实验和对烧结试样块进行力学性能及磨损质量损失进行测试,并对预合金粉与金刚石的界面结合情况进行探讨。结果表明:预合金粉中形成了Co3Fe7、CoFe15.7、FeCu4等中间相,在一定程度上实现合金化。3种预合金粉末的形状均为不规则状,粉末颗粒较细,且相互连接,表面疏松,有利于烧结。3种预合金粉中单质相仍占有较大比例,单质配比对烧结体性能有重要影响。Fe含量增加时,试样的理想烧结温度及烧结体力学性能均升高。Fe-Cu配比会对微观结构产生重要影响,胎体对金刚石以机械包镶为主,结合XRD及Raman光谱可知,与预合金粉烧结后的金刚石表面发生石墨化。

 

关键字: FeCoCu预合金粉;Fe-Cu配比;微观结构;烧结胎体;力学性能

Effect of composition of FeCoCu pre-alloyed powders onsintering characters used for diamond tools
XIE De-long1, WAN Long1, SONG Dong-dong1, WANG Shuai2, LIN Feng2, Lü Zhi2, FANG Xiao-hu2, PAN Xiao-yi2, QIN Hai-qing2, CHEN Chao2, XIAO Le-yin2

1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
2. Guangxi Key Laboratory of Superhard Materials, Chinese National Engineering Research Center for Special Mineral Materials, China Nonferrous Metal (Guilin) Geology and Mining Co., Ltd., Guilin 541004, China

Abstract:The FeCoCu pre-alloyed powders were manufactured by co-precipitation method. The microstructure was characterized, the sintering experiments were carried out, the mechanical properties and wear loss were tested and the combination condition between diamond and the powders was analyzed. The results show that the mesophases, such as Co3Fe7, CoFe15.7 and FeCu4, are formulated in the three powders, and all the powders have irregular shapes, interconnected fine particles and large surface areas. Although the solid solutions are formed, the sintering, mechanical properties and mass loss of the three powders are based on the Fe-Cu ratios. With Fe content increasing, the ideal sintering temperatures, hardness and three point bend strength raise. The relative density decreases, the wear loss becomes better. Fe-Cu ratio has important influence on the powders microstructure. The mechanical retention is the main strength in the matrix and graphitization has occurred in the diamond surface after sintering with the FeCoCu pre-alloyed powders.

 

Key words: FeCoCu pre-alloyed powders; Fe-Cu ratio; microstructure; matrix; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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