Gas Nitriding Mechanism in Titanium Powder Injection Molded Products

Gas surface treatment is considered to be especially effective for Titanium because of its high reactivity. In this study, we investigated the gas nitriding mechanism in titanium sintered parts produced by metal powder injection molding (MIM) process. In MIM process, gas nitriding can be surface-treated subsequently after debinding and sintering process. Then, the microstructure and nitrogen content of sintered MIM parts are considered to be greatly influenced by not only nitriding conditions but also sintered conditions. In this study, the effects of sintering time on microstructure such as nitrided layer thickness and hardness was investigated. Focus was given to the effects of specimen size on nitriding process, because the size of micro metal injection molding (μ-MIM) product is so small and the specific surface of that product is so large that the mechanical and functional properties can be subject to change by nitriding.

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A Study on the Optimization of Solvent Debinding Process for Powder Injection Molded 316L Stainless Steel Parts

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1133.324 ◽

2016 ◽

Vol 1133 ◽

pp. 324-328 ◽

Cited By ~ 1

Author(s):

Muhammad Aslam ◽

Faiz Ahmad ◽

P.S.M. Bm-Yousoff ◽

Khurram Altaf ◽

Afian Omar ◽

...

Keyword(s):

Stainless Steel ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

316L Stainless Steel ◽

Research Work ◽

Powder Injection ◽

Blade Mixer ◽

Injection Molded ◽

Debinding Process ◽

Scanning Electron

Optimization of solvent debinding process parameters for powder injection molded 316L stainless steel (SS) has been reported in this research work. Powder gas atomized (PGA) 316L SS was blended with a multicomponent binder in Z-blade mixer at 170°C ± 5°C for 90 minutes. Feedstock was successfully injected at temperature 170 ± 5°C. Injection molded samples were immersed in n-heptane for 2h, 4h, 6h and 8h at temperatures 50°C ,55°C and 60°C to extract the soluble binder components. Scanning electron microscope (SEM) results attested that soluble binder components were completely extracted from injection molded samples at temperature 55°C after 6h.

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Behavior of Debinding and Sintering in Micron and Submicron-Sized Copper Powder Injection Molded Parts

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.79.1593 ◽

2013 ◽

Vol 79 (807) ◽

pp. 1593-1603 ◽

Cited By ~ 1

Author(s):

Kazuaki NISHIYABU ◽

Daiki TANABE ◽

Yasuhiro KANOKO ◽

Shigeo TANAKA

Keyword(s):

Copper Powder ◽

Powder Injection ◽

Molded Parts ◽

Injection Molded

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Microstructure, Hardness, and Wear Resistance of Powder-Injection-Molded Products of Fe-Based Metamorphic Powders

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.26-28.355 ◽

2007 ◽

Vol 26-28 ◽

pp. 355-358

Author(s):

Chang Kyu Kim ◽

Chang Young Son ◽

Dae Jin Ha ◽

Tae Sik Yoon ◽

Sung Hak Lee

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Wear Resistance ◽

Injection Molding ◽

Powder Injection Molding ◽

Powder Injection ◽

Thermally Stable ◽

Austenitic Matrix ◽

Amorphous Phases ◽

Injection Molded

Powder injection molding (PIM) process was applied to Fe-based metamorphic alloy powders, and microstructure, hardness, and wear resistance of the PIM products were analyzed and compared with those of conventional PIM stainless steel products. When Fe-based metamorphic powders were injection-molded and then sintered at 1200 oC, completely densified products with almost no pores were obtained. They contained 34 vol.% of (Cr,Fe)2B borides dispersed in the austenitic matrix without amorphous phases. Since these (Cr,Fe)2B borides were very hard and thermally stable, hardness, and wear resistance of the PIM products of Fe-based metamorphic powders were twice as high as those of conventional PIM stainless steel products. Such property improvement suggested new applicability of the PIM products of Fe-based metamorphic powders to structures and parts requiring excellent mechanical properties.

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