Study on Manufacture of 2:17 Sm-Co Magnets by Powder Injection Molding

2005 ◽  
Vol 475-479 ◽  
pp. 2143-2146
Author(s):  
Hai Qing Yin ◽  
Cheng Chang Jia ◽  
Xuan Hui Qu
Keyword(s):  
Injection Molding ◽  
Stearic Acid ◽  
High Density Polyethylene ◽  
Powder Injection Molding ◽  
High Density ◽  
Paraffin Wax ◽  
Powder Injection ◽  
Magnetic Characteristics ◽  
Thermoplastic Polymer ◽  
Thermal Debinding

Manufacture of 2:17 Sm-Co magnets by powder injection molding was investigated. The binder of thermoplastic polymer was selected as the wax-based system including paraffin wax, stearic acid and high density polyethylene. Before mixing with paraffin wax and high density polyethylene, the powder of 5-8 µm was coated by stearic acid. The molding compacts were obtained under 200°C without deficits. Solvent debinding and thermal debinding were combined to remove the binder. The basic magnetic characteristics of the specimen were of the same level as those by powder metallurgy technique, which indicated that to fabricate 2:17 Sm-Co magnets by powder injection molding was feasible.

Two-dimensional simulation of mass transport in polymer removal from a powder injection molding compact by thermal debinding

2001 ◽  
Vol 16 (8) ◽  
pp. 2436-2451 ◽  
Author(s):  
Ying Shengjie ◽  
Y. C. Lam ◽  
S. C. M. Yu ◽  
K. C. Tam
Keyword(s):  
Injection Molding ◽  
Mass Transport ◽  
Liquid Flow ◽  
Gas Flow ◽  
Powder Injection Molding ◽  
Forced Flow ◽  
Powder Injection ◽  
Two Dimensional ◽  
Thermal Debinding ◽  
Dimensional Simulation

Two-dimensional simulation of thermal debinding in powder injection molding based on mass and heat transfer in deformable porous media is proposed. The primary mechanisms of mass transport, i.e., liquid flow, gas flow, vapor diffusion, and convection, as well as the pyrolysis of polymers, and their interactions, are included in the model. The simulated results revealed that polymer removal process is primarily affected by liquid flow, which is mainly dominated by pressure-forced flow rather than capillary-driven flow. A significant phenomenon, enrichment with liquid polymer in the outer surface regions of the compact, is explained.

Rheological and thermal debinding properties of blended elemental Ti-6Al-4V powder injection molding feedstock

2017 ◽  
Vol 311 ◽  
pp. 357-363 ◽  
Author(s):  
Dongguo Lin ◽  
Daniel Sanetrnik ◽  
Hanlyun Cho ◽  
Seong Taek Chung ◽  
Young Sam Kwon ◽  
...  
Keyword(s):  
Injection Molding ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Blended Elemental ◽  
Thermal Debinding

Investigation on Thermal Debinding of Powder Injection Molding

2003 ◽  
Vol 437-438 ◽  
pp. 129-132
Author(s):  
Yee Cheong Lam ◽  
Ying Shengjie ◽  
K.H. Lam ◽  
Jan Ma ◽  
K.C. Tam ◽  
...  
Keyword(s):  
Injection Molding ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Thermal Debinding

Rheological and thermal debinding behaviors of silicon nitride in powder injection molding

2019 ◽  
Vol 45 (14) ◽  
pp. 16982-16991
Author(s):  
Chang Woo Gal ◽  
Joo Won Oh ◽  
Gi Woung Song ◽  
Da Seul Shin ◽  
Seong Jin Park
Keyword(s):  
Silicon Nitride ◽  
Injection Molding ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Thermal Debinding

Effects of thermal debinding on surface roughness in micro powder injection molding

2007 ◽  
Vol 61 (3) ◽  
pp. 809-812 ◽  
Author(s):  
L. Liu ◽  
N.H. Loh ◽  
B.Y. Tay ◽  
S.B. Tor ◽  
Y. Murakoshi ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Injection Molding ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Thermal Debinding

Investigation of Deibinding and Sintering of 3Y-ZrO2 Gear Fabricated by Micro Powder Injection Molding

2013 ◽  
Vol 749 ◽  
pp. 378-386
Author(s):  
Lin Liu ◽  
Yu Chen ◽  
Xin Lei Ni ◽  
Hai Qin Yin ◽  
Xuan Hui Qu
Keyword(s):  
Injection Molding ◽  
Petroleum Ether ◽  
Rapid Development ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Binder System ◽  
Anhydrous Alcohol ◽  
Ether Mixture ◽  
Thermal Debinding ◽  
Influence Of Solvent

The rapid development of micro-system and its related products has caused an upsurge of micro components, and the micro powder injection molding is potential for its mass production. In this work, the solvent debinding mechanism of the in-house feedstock was studied. The influence of solvent debinding, thermal debinding and sintering on the micro gears was investigated. The weight loss of 3Y-ZrO2 micro gears ranging from 200 to 900μm were compared by using six types of solvent including ether mixture withanhydrous alcohol, petroleum ether, chloroform and are hexane etc. The thermal debinding scheme was determined based on the DSC and TGA results of the binder system. The effect of the heating rate on the micro gears was investigated. The experimental results showed that the petroleum ether mixture with anhydrous alcohol yielded the best debinding effect for the micro gears, which was controlled by diffusion and dissolution. Using the established debinding and sintering schedule, the defect free micro gears were successfully fabricated.

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