Kinetics of densification and growth of refractory phase grains in the liquid-phase sintering of very finely divided tungsten-copper materials

Prokushev, N. K.; Smirnov, V. P.

doi:10.1007/bf00797302

Cited by 11 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For W-Cu, the solubility of W in Cu is less than 10 −3 at.% [10], and grain growth likely occurs by a combination of solutionreprecipitation [11][12][13] and coalescence [14][15][16]. For Mo-Cu the reported solubility of Mo in Cu of 0.5 to 1.3 wt.% at 1100 to 1500°C [17] would be expected to result in a dominant role for solution-reprecipitation, but reported grain growth rates are much lower, raising the probability of a significant contribution from coalescence [18].…”

Section: Introductionmentioning

confidence: 99%

Activated liquid phase sintering of W–Cu and Mo–Cu

Johnson¹

2015

International Journal of Refractory Metals and Hard Materials

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Activated liquid phase sintering of W–Cu and Mo–Cu

Johnson¹

2015

International Journal of Refractory Metals and Hard Materials

View full text Add to dashboard Cite

“…According to the literature [22,23], during liquid phase sintering, if the volume fraction of the liquid phase does not exceed a definite value, the densification mechanisms of LPS cannot operate properly. However, it seems that the negative effect of this phenomenon on rearrangement is higher than that of the two other stages of LPS.…”

Section: Powder Compositionmentioning

confidence: 99%

Cold compaction behavior and pressureless sinterability of ball milled WC and WC/Cu powders

2016

View full text Add to dashboard Cite

In this research, cold compaction behavior and pressureless sinterability of WC, WC-10%wtCu and WC-30%wtCu powders were investigated. WC and WC/Cu powders were milled in a planetary ball mill for 20h. The milled powders were cold compacted at 100, 200, 300 and 400 MPa pressures. The compressibility behavior of the powders was evaluated using the Heckel, Panelli-Ambrosio and Ge models. The results showed that the Panelli-Ambrosio was the preferred equation for description the cold compaction behavior of the milled WC and WC-30%wtCu powders. Also, the most accurate model for describing the compressibility of WC-10%wtCu powders was the Heckel equation. The cold compacts were sintered at 1400 o C. It was found that by increasing the cold compaction pressure of powder compacts before sintering, the sinterability of WC-30%wtCu powder compacts was enhanced. However, the cold compaction magnitude was not affected significantly on the sinterability of WC and WC-10%wtCu powders. The microstructural investigations of the sintered samples by Scanning Electron Microscopy (SEM) confirmed the presence of porosities at the interface of copper-tungsten carbide phases.

show abstract

“…Therefore, the solubility of WC in Co controls the densification rate. A pseudo-binary phase diagram for the system of cobalt and WC 6) shows that the solubility of WC in cobalt is >20 at% at 1673 K. On the other hand, the solubilities of tungsten 7) and carbon 8) in copper are <0:002 at% and <0:0001 at% at 1673 K, respectively, which are four to five orders of magnitude lower than the solubility in cobalt. Although the diffusivity of tungsten and carbon in copper is not well known, the rate controlling process is thought to be the phase boundary reaction because of the low solubility of tungsten and carbon in copper.…”

Section: Sintering Behavior Of Wc Cemented Carbidementioning

confidence: 99%

Development of Creep-Resistant Tungsten Carbide Copper Cemented Carbide

et al. 2009

View full text Add to dashboard Cite

Fine-grained tungsten carbide copper (WC-Cu) cemented carbide was sintered via spark plasma sintering at 1773 K using a fine WC powder with a mean particle size of 0.11 mm. The mechanical properties were compared with tungsten carbide cobalt (WC-Co) cemented carbide and a binderless WC-sintered material. The Vickers hardness and fracture toughness obtained by the indentation fracture method for WC-10 mass% Cu cemented carbide were $1600 and $10 MPaÁm 0:5 , respectively, which were in no way inferior to the values for WC-Co cemented carbide. Increasing the amount of copper improved the toughness and degraded the hardness. WC-Cu cemented carbide exhibited much higher creep resistance than WC-Co cemented carbide, and was the same as the binderless WC-sintered body up to 1273 K.

show abstract

Kinetics of densification and growth of refractory phase grains in the liquid-phase sintering of very finely divided tungsten-copper materials

Cited by 11 publications

References 5 publications

Activated liquid phase sintering of W–Cu and Mo–Cu

Activated liquid phase sintering of W–Cu and Mo–Cu

Cold compaction behavior and pressureless sinterability of ball milled WC and WC/Cu powders

Development of Creep-Resistant Tungsten Carbide Copper Cemented Carbide

Contact Info

Product

Resources

About