US 9,518,308 B2Granted

High-density and high-strength WC-based cemented carbide

AssigneeKing Fahd University of Petroleum and Minerals

InventorsKhwaja Mohammad, Nouari Saheb, Tahar Laoui, Nasser Al-Aqeeli

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Abstract

The synthesis of high performance WC-Co cemented carbides which can be efficiently used in the cutting tool industry. WC with different particle sizes and different grain growth inhibitors were consolidated through spark plasma sintering technique and to form a cemented carbide with best combination of mechanical properties. VC and Cr3C2 are included as grain growth inhibitors in different amounts and combination to the WC-Co powder composition. Higher amount of inhibitors results in lower grain sizes and higher hardness values, however adding more than a crucial amount was observed to degrade the mechanical properties.

Claims13

Dependent claims

A spark plasma sintered tungsten carbide-cobalt cemented carbide, comprising:

tungsten carbide particles having an average particle size of no greater than 20 nm,
a cobalt metal matrix,
a vanadium carbide as a first grain growth inhibitor, and
a chromium carbide as a second grain growth inhibitor,
wherein the cobalt metal matrix is present in the cemented carbide in an amount of from 9 to 12% by weight based on the total weight of the tungsten carbide and the cobalt, and the total amount of the vanadium carbide and the chromium carbide is from 0.2 to 0.8 wt % based on the total weight of the tungsten carbide and the cobalt, and
wherein the tungsten carbide particles are dispersed in the cobalt metal matrix in disaggregated form.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/138,177Filed 23 Dec 2013
Published: US 2015/0176106 A125 Jun 2015
Granted: 13 Dec 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

C22C 29/08
Based on carbides, but not containing other metal compounds: based on tungsten carbide
B22F 3/105
Sintering only: by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
B22F 2003/1051
By using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding: by electric discharge
B22F 2301/15
Metallic composition of the powder or its coating: nickel or cobalt

Family

US 2015/0176106 A1Pre-grant publication · published 25 Jun 2015
US 9,518,308 B2This patent

From the US filing history. Foreign family members aren’t listed.

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