Simultaneous Acquirement of High Complication and functionality by New Metal Injection Molding Process.

Research Project

Project/Area Number	12650717
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Material processing/treatments
Research Institution	Kumamoto University
Principal Investigator	MIURA Hideshi Kumamoto, University, Fac. of Eng., Professor, 工学部, 教授 (30117254)
Co-Investigator(Kenkyū-buntansha)	UEMURA Makoto Kumamoto Industrial Research Institute, Researcher, 生産技術部・研究員 MATSUDA Mitsuhiro Kumamoto, University, Fac. of Eng., Assistant Researcher, 工学部, 助手 (80332865)
Project Period (FY)	2000 – 2001
Project Status	Completed (Fiscal Year 2001)
Budget Amount *help	¥2,500,000 (Direct Cost: ¥2,500,000) Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000) Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
Keywords	Metal injection Molding / Joining / High complication / High functionalitv / Solvent debindine temp. / Behavior of sintering shrinkage
Research Abstract	MIM process is hoped to be an advanced powder processing technique for near net shape forming the high density, high performance, and complicated pars. However, there still remains the issue of limitation in the shape and volume of MIM compacts because of using the die. In this study, as one of new approaches to improve the above problems in MIM process, MIM in-process joining of thin and hollow parts ***ing the exuded wax during solvent debinding step has been attempted to produce larger, more complicated and functional parts by combination of the same or different materials such as non-magnetic austenitic stainless steels (SUS304L, 316L) and martensitic stainless steel (SUS420J1) and pure iron with high magnetic flux density. Results obtained were as follows ; 1) Perfect joined couples of the same (SUS304L/SUS304L, SUS420J1/SUS420J1) and different (SUS304L/SUS420J1) materials were obtained by MIM in-process joining (application of the exuded wax form green compacts during solvent debinding step). 2) For the couple of iron and stainless steel compact, joining was difficult because of the different starting temperature of shrinkage. However, excellent joining was obtained by using stainless steel powder with fine particle size and vacuum sintering. 3) For the couple of austenitic stainless steel and ferro-silicom compact, high functionality (magnetic non-magnetic ＆ (1.60 Tesla)) and perfect joint were obtained.