Cemented carbide with binder phase enriched surface zone

Details Cemented carbide with binder phase enriched surface zone Cemented carbide with binder phase enriched surface zone

1994-11-17

1997-07-15

Mai, Ngoclan

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Controlled cooling after sintering

419 58, 419 59, 419 60, B22F 300

Patent

active

056492790

ABSTRACT:
There is disclosed a new process for binder phase enrichment. The process combines binder phase enrichment by dissolution of cubic phase with the requirements that cause formation of stratified layers, resulting in a unique structure. The new structure is characterized by, in comparison with the ones previously known, deeper stratified layers and less maximum binder phase enrichment. The possibility of combining dissolution of the cubic phase with formation of stratified layers offers new possibilities to optimize the properties of tungsten carbide based cemented carbides for cutting tools.
The new process offers possibilities to combine the two types of gradients. The dissolution of cubic phase moves the zone with maximum mount of stratified binder phase from the surface to a zone close to and below the dissolution front. By controlling the depth of dissolution, the interstitial balance and the cooling rate, a cemented carbide with a unique combination of toughness and plastic deformation resistance can be achieved.

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patent: 5310605 (1994-05-01), Baldoni, II et al.
Patent Abstracts of Japan, vol. 10, No. 189 (M-494), 3 Jul. 1986 & JP-A-61 034103 (Hitachi Metals), 18 Feb. 1986.

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