Method of preparing ultra-fine hard alloy mixture of tungsten and cobalt and product

A technology of cemented carbide and mixed materials, which is applied in the field of preparation of ultrafine cemented carbide tungsten and cobalt mixed materials and products, can solve the problems of unmanufactured nano-hard alloys, non-uniform grain growth, lattice distortion, etc. Achieve the effects of simplifying processing equipment, avoiding growth, and uniform sintering shrinkage

Inactive Publication Date: 2007-03-07
谭日善 +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There will be many difficulties when the above method is used to prepare ultra-fine-grained cemented carbide. First, because tungsten carbide WC and metal cobalt are mixed by solid-phase ball milling, it takes a long time for mixed ball milling. For WC, the process of ball milling will cause crystal lattice Distortion energy and therefore can cause non-uniform grain growth during sintering, and secondly, long-term ball milling will cause fouling, and even long-term ball milling may not make the mixture reach the ideal mixing state. This also involves the particle size characteristics and particle size dispersibility of WC and Co powder
[0006] To this end, Nanodyne and Zhuzhou Cemented Carbide Factory hope to combine powder manufacturing technology with cemented carbide manufacturing technology, that is, first use soluble ammonium metatungstate and cobalt nitrate compound to dissolve, and then use spray thermochemical method to make WC-Co composite powder mixed at the molecular level, and then use this uniformly mixed composite powder to prepare cemented carbide, which can overcome the shortcomings of traditional production methods caused by long-term ball milling and mixing to overcome cemented carbide sintering Agglomeration recrystallization and liquid phase recrystallization will occur in the process, but so far, although nano-scale composite WC-Co powder can be prepared, and a grain growth inhibitor like WC is added to the alloy mixture , but has not yet produced nano-hard alloys with alloy grains compatible with raw material powders

Method used

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  • Method of preparing ultra-fine hard alloy mixture of tungsten and cobalt and product

Examples

Experimental program
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Embodiment 1

[0019] This example method includes the following steps:

[0020] 1. Raw materials: 1.5 kg of 0.4 μm WC powder prepared by our company, 0.4 kg of cobalt acetate, and 500 ml of alcohol;

[0021] 2. Put the cobalt acetate into the alcohol and stir well until all the cobalt acetate is completely dissolved to form a completely clear and transparent cobalt acetate solution;

[0022] 3. Slowly add WC powder to the above cobalt acetate solution while stirring, and continue stirring for 0.2-1 hour after adding WC to ensure that the WC powder is evenly dispersed in the solution;

[0023] 4. Spray-dry the above-mentioned WC powder suspension. Spray-drying is carried out under the condition of continuously stirring WC and cobalt acetate compound solution mixed slurry. The drying temperature is between 100-120°C. The spraying rate depends on the particle size of WC It is determined that the smaller the particle size, the faster the spray rate can be. Generally, it should be ensured that ...

Embodiment 2

[0029] Example 2 Example 3 Example 4 Example 5

[0030] WC powder particle size 0.2μm 0.4μm 0.6μm 0.8μm

[0031] WC powder weight 1Kg 1.5Kg 2Kg 2Kg

[0032] Cobalt compound Cobalt acetate 450g Cobalt oxalate 300g Cobalt acetate 800g Cobalt oxalate 450g

[0033] Solvent Ether Methanol Ether Ethanol

[0034] Solid-liquid ratio 1:5 1:9 1:3 1-6

[0035] Drying temperature 100°C 100°C 110°C 120°C

[0036] Reduction temperature 400-500℃ 550-650℃ 600-700℃ 700-800℃

[0037] The above-mentioned solid-to-liquid ratio refers to the volume ratio of the ultrafine tungsten carbide powder to the organic cobalt compound solution.

[0038] The mixed powder that produces with above-mentioned embodiment also can make the cemented carbide grain size size of making and initial powder grain size adapt.

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Abstract

The invention discloses a preparing method of composite material of ultrafine hard alloy tungsten and cobalt, which comprises the following steps: dissolving soluble organic cobalt compounds in the solution; fetching transparent solution; blending ultrafine tungsten carbide powder and organic cobalt compounds solution evenly; coating the organic cobalt compounds on the surface of tungsten carbide; evaporating liquid phase at spraying drying pattern; making organic cobalt compounds clad on the surface of tungsten carbide evenly; reducing; making metal cobalt clad on the external surface of each tungsten carbide particle.

Description

technical field [0001] The invention belongs to a processing method of cemented carbide tungsten-cobalt mixture and products made by the method. Background technique [0002] With the rapid development of industry and technology, machining and IT industries have put forward high requirements for cemented carbide. For example, in the IT industry, what is required in the market is: high integration, miniaturization and standardization of electronic components, so that the diameter of cemented carbide micro-drills (a micro-drill used for processing printed circuit boards) is required to be smaller and smaller, or even It is less than 1mm in diameter, which requires the ability to produce cemented carbide with ultrafine grains, and cemented carbide with ultrafine grains needs to be made with fine and ultrafine tungsten carbide powder and cobalt powder. [0003] Cemented carbide is a brittle material. The contradiction between hardness and strength, wear resistance and toughness...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04B22F9/24
Inventor 谭日善邝钜津谭天翔邝焯锋张涛
Owner 谭日善
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