Sintering of milled WC powder in the presence of cobalt

Journal Article · Fri Jun 01 04:00:00 EDT 1973 · Planseeber. Pulvermet., v. 21, no. 2, pp. 110-120

OSTI ID:4411609

Bengtsson, B; Johannesson, T; Lindau, L

In order to establish the relationship between the milling and sintering of WC- Co powder in the production of cemented carbide, the sintering of milled WC powder mixed with unmilled Co powder was studied. The as-received powder was characterized by x-ray line broadening analysis, chemical analysts, and scanning electron microscopy. Using a temperature program similar to those used in production, the shrinkage during sintering was followed with a dilatometer and the structural development with a scanning electron microscope. Although the dislocation density is much higher in the heavily miller WC powder than in the lightly milled WC powder, the same mechanism is active during the initial stages of sintering. The shrinkage is, however, faster in the heavily milled powder mixture and about 75% of the total shrinkage takes place before the binder metat has melted. In this case a continuous structure is developed at an earlier stage and the pore elimination is more efficient than in the lightly milled powder. (auth)

• Research Organization: Chalmers Univ. of Tech., Goteborg
• NSA Number: NSA-29-008208
• OSTI ID: 4411609
• Journal Information: Planseeber. Pulvermet., v. 21, no. 2, pp. 110-120, Journal Name: Planseeber. Pulvermet., v. 21, no. 2, pp. 110-120; ISSN PLPUA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*COBALT ALLOYS-- SINTERING
*TUNGSTEN CARBIDES-- SINTERING
DISLOCATIONS
MILLING
N50120* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Preparation & Fabrication
SHRINKAGE