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Carbon-adding hard alloy material and preparation method thereof

A cemented carbide and mixed material technology, applied in the field of friction pairs for mechanical seals, can solve the problems of poor dry friction performance and high cost, and achieve the effects of enhanced dry friction performance, easy operation and reduced friction coefficient

Active Publication Date: 2011-08-10
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But cemented carbide is not without flaws, especially dry friction performance is relatively poor, and the cost is high

Method used

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  • Carbon-adding hard alloy material and preparation method thereof
  • Carbon-adding hard alloy material and preparation method thereof
  • Carbon-adding hard alloy material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh the raw materials of the following formula ratio: 90 parts by weight of tungsten carbide (WC), 4.2 parts by weight of nickel (Ni), 0.4 parts by weight of chromium (Cr), 0.4 parts by weight of cobalt (Co), 2 parts by weight of paraffin wax (as plasticizer) Parts, graphite (C) 3 parts by weight.

[0045] Produced according to the following process:

[0046] (1) Mixing: WC, Ni, Cr, Co are mixed evenly by the above weight parts;

[0047] (2) ball milling: in the mixture that step (1) obtains, add the aviation gasoline as grinding medium, every kilogram of mixture adds 0.3 liters of aviation gasoline, then carries out 48 hours of ball milling to the mixture that has added aviation gasoline with ball mill change;

[0048] (3) add paraffin wax as plasticizer by above-mentioned weight component, then ball mill homogenization 6 hours, make each material mix evenly;

[0049] (4) drying: vacuum drying the mixed material after step (3) ball milling and homogenization, so t...

Embodiment 2

[0063] Weigh the raw materials of the following formula ratio: 90 parts by weight of tungsten carbide (WC), 4.2 parts by weight of nickel (Ni), 0.4 parts by weight of chromium (Cr), 0.4 parts by weight of cobalt (Co), and 2 parts by weight of plasticizer (paraffin wax) , 5 parts by weight of graphite (C).

[0064] The preparation process is the same as in Example 1, wherein the density of the molded green body obtained after step (7) compression molding is 7.482g / cm 3 ; Its density of cemented carbide material obtained after step (9) sintering is 12.107g / cm 3 .

[0065] Compared with Example 1, Example 2, except that the carbon component has been increased, the density decreases, and the carbon particles in the obvious tissue increase significantly in addition (see figure 2 ).

[0066] After being processed into parts, it has passed the 1.6MPa static pressure test without leakage.

Embodiment 3

[0068] Weigh the raw materials of the following formula ratio: 90 parts by weight of tungsten carbide (WC), 4.2 parts by weight of nickel (Ni), 0.4 parts by weight of chromium (Cr), 0.4 parts by weight of cobalt (Co), and 2 parts by weight of plasticizer (paraffin wax) , graphite (C) 2 parts by weight.

[0069] The preparation process is the same as that in Example 1, wherein the green body density of 7.521g / cm is obtained after step (7) compression molding 3 ; Its density of cemented carbide material obtained after step (9) sintering is 12.752g / cm 3 .

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Abstract

The invention discloses a carbon-adding hard alloy material and a preparation method thereof. The alloy comprises the following raw materials in parts by weight: 89-91 parts of tungsten carbide, 3.7-4.7 parts of nickel, 0.35-0.45 part of chromium, 0.35-0.45 part of cobalt, 1.0-2.0 parts of paraffin, 2.0-5.0 parts of graphite and the balance aviation gasoline, wherein 0.2-0.35 liter of aviation gasoline is added in per kilogram of the above materials. The hard alloy of the invention has better dry friction property compared with the traditional hard alloy; and the hard alloy has lower production cost, also has good wear resistance, high strength and other properties of the traditional hard alloy, and has the advantages of simple preparation technology, easy operation and the like.

Description

technical field [0001] The invention relates to the technical field of friction pairs for mechanical seals, in particular to a carbon-added cemented carbide material suitable for friction pairs for mechanical seals and a preparation method thereof. Background technique [0002] Cemented carbide is composed of refractory metal compounds (tungsten carbide, etc.) and bonding metals (cobalt, nickel, etc.), with high melting point, high elastic modulus, high strength, high hardness, and wear resistance. Thermal conductivity and good corrosion resistance first appeared as a tool material, mainly used to make tools and cutting tools, and now it is widely used in the field of friction pair materials for mechanical seals. [0003] With the rapid development of petrochemical, chemical fiber, chemical fertilizer, atomic energy, aerospace and other industries, the scope of use of mechanical seals is becoming wider and wider, and the conditions of use are becoming more and more stringent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/04
Inventor 邬国平
Owner NINGBO VULCAN TECH CO LTD
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