EPDM改性金属注射成形用油蜡基粘结剂体系

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摘要选用三元乙丙橡胶(EPDM)作为金属注射成形(MIM)用石蜡-油-聚丙烯粘结剂体系的改性剂,将改性前后四种配比粘结剂与17-4PH不锈钢粉末混合制备喂料,并注射成形。研究EPDM对喂料流变性能、生坯性能及脱脂性能的影响。结果表明：石蜡-油-聚丙烯粘结剂体系中加入EPDM改性后,喂料黏度增大,但不影响成形。随粘结剂中EPDM含量升高,注射坯冲击功提高,抗弯强度降低。EPDM含量为2%时喂料的综合力学性能较好,喂料注射七次后,生坯冲击功可达2.048 J,抗弯强度达6.3 MPa,仍保持较好的力学性能。加入EPDM后生坯溶剂脱脂速率加快,热脱脂后碳、氧含量均可控制在合理范围。

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	张晨铭
	卢仁伟
	杨忠臣
	李笃信

关键词 ：金属注射成形, 粘结剂, EPDM, 流变性能, 力学性能, 脱脂

Abstract：EPDM was used as modifier in oil-wax-polypropylene based binder system for MIM in this paper. Four formulations of binder and 17-4PH stainless steel powder were mixed to prepare feedstocks and then injection molding. The effects of EPDM content on the rheological characteristics of feedstocks, properties of green parts as well as degreasing properties were studied. The results show that the viscosity of feedstock increases with EPDM addition. With the increase of EPDM content, the impact energy of green parts increases as well as bending strength decreases. The optimal mechanical properties of green parts are obtained when EPDM content is 2%. After seven cycles, the impact energy is 2.048 J, the bending strength is 6.3 MPa. In addition, the speed of solvent debinding increases with EPDM addition. Carbon content and oxygen content of debound parts can keep in reasonable range.

Key words： MIM binder EPDM rheological properties mechanical properties degreasing

收稿日期: 2018-03-29 出版日期: 2019-07-19

ZTFLH:

TF124

通讯作者: 李笃信,教授,博士。电话：13874882497;E-mail: liduxin6404@csu.edu.cn

引用本文:

张晨铭, 卢仁伟, 杨忠臣, 李笃信. EPDM改性金属注射成形用油蜡基粘结剂体系[J]. 粉末冶金材料科学与工程, 2018, 23(6): 619-623.
ZHANG Chenming, LU Renwei, YANG Zhongchen, LI Duxin. Modification of oil-wax-polypropylene based binder by EPDM for MIM. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 619-623.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2018/V23/I6/619

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