A kind of cemented carbide composite material, its preparation method and application

A technology of cemented carbide and composite materials, applied in the field of its preparation and cemented carbide composite materials, can solve the problems of reduced mechanical properties such as workpiece wear resistance, short service life, wear of solder or cemented carbide blocks, etc. Liquidus eutectic temperature and sintering temperature, the effect of retaining wear resistance and improving wear resistance

Active Publication Date: 2018-10-09
SEED TECH CORP LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0005] In the prior art, the cemented carbide block (or sheet) is generally composed of tungsten carbide and cobalt, and its sintering temperature needs to reach 1400-1450°C, which requires high equipment performance and high energy consumption. thereby increasing the cost
[0006] There is also a technical scheme of adding diamond powder in the hard alloy block (or sheet). There are three kinds of existing diamond powder-WC-Co composite materials: one is to use high temperature and high pressure on the WC-Co hard alloy substrate. The method of pressing diamond powder on WC-Co cemented carbide, that is, PDC compact (polycrystalline diamond compact); this method requires high equipment performance, expensive high-pressure equipment and high energy consumption, and the material is durable Poor impact performance, prone to failure when used in oil field drilling
The other is to deposit the diamond film on the WC-Co cemented carbide substrate by low-pressure CVD (chemical vapor deposition); this method needs to be deposited on the WC-Co cemented carbide substrate because Co has the effect of catalyzing graphitization on diamond. A complex transition layer is added to the diamond film to enhance the adhesion between the diamond film and the WC-Co cemented carbide substrate. At the same time, the impact resistance of the material is also poor and the thickness of the deposited layer is very thin
The third is to weld the diamond thick film or large particles on the WC-Co cemented carbide substrate; although this method is simple, the adhesion between the diamond thick film or large particles and the WC-Co cemented carbide substrate is poor, and the service life short
However, due to the low flame temperature of the welding gun in the spray welding process, the solder is prone to high porosity due to uneven heating. Wear or even fall off, eventually resulting in the reduction of mechanical properties such as wear resistance of the workpiece
Moreover, spray welding is only suitable for the hard surface treatment of the outer surface of the steel substrate, and cannot meet the process requirements that the inner wall also needs hard surface treatment.

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  • A kind of cemented carbide composite material, its preparation method and application
  • A kind of cemented carbide composite material, its preparation method and application
  • A kind of cemented carbide composite material, its preparation method and application

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preparation example Construction

[0038] The present invention also provides a preparation method for the above cemented carbide composite material, comprising:

[0039] A) mixing tungsten carbide, cobalt, nickel and phosphorus according to the mass ratio, ball milling and drying, and mixing with diamond powder coated with a tungsten layer on the surface to obtain cemented carbide composite material powder;

[0040] B) The cemented carbide composite material powder is pressed and sintered to obtain the cemented carbide composite material.

[0041] The amounts of the above-mentioned tungsten carbide, cobalt, nickel, phosphorus, and diamond powder coated with a tungsten layer are the same as above, and will not be repeated here.

[0042] The temperature of the sintering is preferably 1050°C to 1200°C.

[0043] The present invention has no special limitation on the above-mentioned pressing and sintering, and may be pressing methods and sintering methods well known to those skilled in the art.

[0044] Preferabl...

Embodiment 1

[0061] A cemented carbide composite material is prepared, comprising 60 wt% of tungsten carbide, 7 wt% of cobalt, 3 wt% of nickel, 0.25 wt% of phosphorus, and 29.7 wt% of diamond powder coated with a tungsten layer on the surface. First mix tungsten carbide, cobalt, nickel, and phosphorus according to the above ratio, ball mill and dry, then add diamond powder coated with a tungsten layer on the surface, mold press, and sinter at 1200°C for 0.5h to obtain a cemented carbide block with a thickness of 3mm.

[0062] Using the spot welding process, the above-mentioned cemented carbide block and the surface of the steel substrate are combined together, and then the cemented carbide sheet, solder and cast tungsten carbide powder are welded together with the steel substrate by using the plasma surfacing process to form a firm Metallurgically bonded and designated as Material A.

[0063] Its performance test is carried out, and the results are shown in Table 1:

Embodiment 2

[0065] A cemented carbide composite material is prepared, comprising 68wt% of tungsten carbide, 8wt% of cobalt, 4wt% of nickel, 0.25wt% of phosphorus, and 19.75wt% of diamond powder coated with a tungsten layer on the surface. First mix tungsten carbide, cobalt, nickel, and phosphorus according to the above ratio, ball mill and dry, then add diamond powder coated with a tungsten layer on the surface, mold press, and sinter at 1200°C for 0.5h to obtain a cemented carbide block with a thickness of 3mm.

[0066] Using the spot welding process, the above-mentioned cemented carbide block and the surface of the steel substrate are combined together, and then the cemented carbide sheet, solder and cast tungsten carbide powder are welded together with the steel substrate by using the plasma surfacing process to form a firm Metallurgically bonded and noted as Material B.

[0067] Its performance test is carried out, and the results are shown in Table 1:

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Abstract

The invention provides a hard alloy composite material. The hard alloy composite material comprises tungsten carbide, cobalt, nickel, phosphorus, and diamond powder coated with a tungsten layer on the surface. Phosphorus, nickel and the diamond powder coated with the tungsten layer on the surface are added in the hard alloy composite material, so that the liquid-phase eutectic temperature and the sintering temperature of a hard alloy are largely lowered, and the low-temperature sintering of the hard alloy material is realized; and due to lower sintering temperature, the diamond carbonization is preferably prevented, the wear resistance is effectively retained, and the wear resistance of the material is greatly improved. Experimental results represent that the liquid-phase eutectic temperature point of the hard alloy composite material is 850-950 DEG C and the sintering temperature is 1050-1200 DEG C.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a cemented carbide composite material, its preparation method and application. Background technique [0002] In modern industrial production, many construction machinery, equipment and components are under very harsh working conditions, such as high temperature, high speed, strong impact, high acid and alkali, etc., and the damage to mechanical parts caused by wear and corrosion continues to increase. The use of ordinary materials has been difficult to meet the special requirements of the harsh working environment for material performance. The use of cemented carbide materials with better performance is made of hard compounds of refractory metals and bonding metals through powder metallurgy. The sintering temperature is generally 1400-1450 ° C, which requires high equipment performance. At the same time High energy consumption leads to high cost, so there are a series of...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C29/08C22C26/00C22C1/05C22C1/10
CPCC22C1/051C22C26/00C22C29/067C22C29/08
Inventor陈灿坤徐跃华
OwnerSEED TECH CORP LTD