Toyooka, Japan
Toyooka, Japan

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Katou K.,Japan Advanced Institute of Science and Technology | Matsumoto A.,Japan Advanced Institute of Science and Technology | Ming S.Z.,Japan Advanced Institute of Science and Technology | Shimojima K.,Japan Advanced Institute of Science and Technology | And 3 more authors.
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy | Year: 2011

The preparation for WC-FeAl hard metal by vacuum sintering was investigated. The mixture of WC and FeAl (Fe-40at% Al) powders which composition was WC-25 vol.%FeAl were treated by wet-milling for 70hr. The average particle size of the powder mixture decreased from 4.2μm to 1.1 μm by wet milling. The powder mixtures before and after wet milling were press-molded into the test-piece and sintered in vacuum of 10 -2- 10 -1 Pa order at various temperature for 1 hr. The densities, microstructures and mechanical properties of the obtained sintered compacts were investigated. When powder mixture after wet milling was used, the compact sintered at 1450 °C had the good relative density of 98.0 %, Vickers hardness of 1350 HV and transverse rapture strength of 2.0 GPa. By the EPMA observation, it was cleared that homogenity of microstructure enhanced by wet milling.


Takada M.,Nippon Tokushu Goukin Co. | Matsubara H.,Nagoya Institute of Technology | Matsubara H.,Japan Fine Ceramics Center | Kawagishi Y.,Nippon Tokushu Goukin Co.
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals | Year: 2012

Cemented carbide dies with the five categories of composition, namely, WC-Co straight alloy, TaNbC-, Cr 3C 2- or VC-containing WC-Co alloys and WC-Ni alloy, were fabricated by sintering and HIP-treatment. The wear behavior of these cemented carbide dies for drawing steel cord wire is examined, and material properties such as hardness, transverse-rupture strength and corrosion resistance are evaluated. Through the above investigations, it is particularly noted that the TaNbC-containing alloy shows the longest life time of steel cord drawing die, which is followed by Cr 3C 2-containing alloy, WC-Co, VC-containing alloy and WC-Ni alloy. The results on strength and corrosion resistance have no relation with the drawing die life. The hardness has some degree of relation with the die life; for example, among the same category alloy, there is such a tendency that the longer die life is obtained for the higher hardness. However, it is not able to explain simply by the viewpoint of hardness the reason why TaNbC-containing alloy has the longest life although the VC-containing alloy has the finest grain size and the highest hardness. The wear mechanism of cemented carbide dies for steel cord wire drawing was discussed to consider WC/Co interface adhesion. © 2012 The Japan Institute of Metals.


Takada M.,Nippon Tokushu Goukin Co. | Matsubara H.,Nagoya Institute of Technology | Matsubara H.,Japan Fine Ceramics Center | Kawagishi Y.,Nippon Tokushu Goukin Co.
Materials Transactions | Year: 2013

Cemented carbide dies with five categories of composition, namely, WCCo straight alloys, TaNbC-, Cr3C2-or VC-containing WCCo alloys and WCNi alloys, were fabricated by sintering and HIP treatment. The wear behavior of these cemented carbide dies for drawing steel cord wire is examined, and material properties such as hardness, transverse-rupture strength and corrosion resistance are evaluated. It is found that the TaNbC-containing alloy shows the longest lifetime as a steel cord drawing die, followed by the Cr3C2-containing alloy, WCCo, VCcontaining alloy and WCNi alloy. The strength and corrosion resistance show no relation with the drawing die life. The hardness has some influence on the die life; for example, within the same alloy category, there is a tendency that the longer die life is obtained for the material with the higher hardness. However, it is not possible to explain simply from the viewpoint of hardness even why the TaNbC-containing alloy has the longest life though the VC-containing alloy has the finest grain size and highest hardness. The wear mechanism of cemented carbide dies for steel cord wire drawing was discussed, focusing on WC/Co interface adhesion. ©2013 The Japan Society for Technology of Plasticity.


Matsumoto A.,Japan National Institute of Advanced Industrial Science and Technology | Kato K.,Japan National Institute of Advanced Industrial Science and Technology | Shimojima K.,Japan National Institute of Advanced Industrial Science and Technology | Hosokawa H.,Japan National Institute of Advanced Industrial Science and Technology | And 2 more authors.
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy | Year: 2010

WC-25vol%FeAl compacts have been prepared using wet milling and the subsequent pulse current sintering. Powder mixtures consisting of (1) WC, Fe-40at% Al and (2) WC, Fe, Al powders have been mixed to give the desired composition of WC-25 vol%FeAl. They have been milled using a cylindrical ball mill with ethanol. Milled powders have been dried at room temperature and consolidated using pulse current sintering method at 1273 K in vacuum. The compacts thus obtained have had fine and homogeneous structure. Vickers hardness of both compacts has increased with increasing milling time. Transverse rupture strength of the former compact has increased with increasing milling time, but that of the latter one abruptly decreased. This is due to the formation of Fe 3W 3C and Al-O phase.

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