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Sintering Behavior and Hardness of Tungsten Prepared by Hard Metal Sludge Recycling Process without Ammonium Paratungstate
텅스텐산암모늄 단계 생략 초경합금 슬러지 재활용 공정에 의해 제조된 텅스텐의 소결 및 경도 특성
Hanjung Kwon, Jung-Min Shin
권한중, 신정민
Korean J. Met. Mater. 2022;60(1):53-61.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.53

In this paper, we suggest a novel recycling process for hard metal sludge that does not use ammonium paratungstate. Ammonia, which in the conventional recycling process is essential for removing sodium and crystallized tungstate, was not used in the novel process. Instead of ammonia, acid was used to remove the..... More

Improvement of Mechanical Properties of Hard Metals Using Solid Solution Strengthened Metallic Binder (Co<sub>1-x</sub>W<sub>x</sub>)
고용 강화 금속 바인더(Co1-xWx) 적용을 통한 초경합금의 기계적 특성 향상
Hanjung Kwon
Korean J. Met. Mater. 2022;60(1):14-25.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.14

The metallic binder in WC-Co hard metals was effectively strengthened using the solid solution phases of Co and W. These metallic phases of Co and W (Co1-xWx, x<1), which consist of two kinds of structures (FCC and HCP), were successfully formed by hydrogen reduction of milled oxides mixtures (Co3O4 and..... More

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