Preparation method for cemented carbide mixture

A technology of cemented carbide and mixture, which is applied in the field of preparation of cemented carbide mixture, which can solve the problems of multiple procedures, long process, shortening the preparation process of mixture, etc., and achieve the effect of ensuring uniformity and improving production efficiency

Active Publication Date: 2009-08-26
株洲江钨博大硬面材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this process method are: the process is long, the process is many and complicated, especially, the product quality is greatly affected by the individual factors of the operator, and it is difficult to ensure the stability of product quality
[0005] Although some manufacturers use paraffin as a molding agent and use s...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Using medium particle WC powder (FSSS. particle size 4.0 μm, total carbon 6.15%) and cobalt powder (FSSS. particle size 1.5 μm) as the main raw materials, the proportion is 92.0wt% WC+8.0wt% Co, plus 2.0 Wt% Wax, add the alcohol of 250ml / kg mixed material as wet milling medium, add the oleic acid of 0.15wt% in mixed slurry. The above-mentioned substances were ball-milled in a 300L tilting ball mill with a rotation speed of 36 rpm, a filling factor of 0.45, and a ball-to-material ratio of 4:1. After wet milling for 48 hours, the slurry was unloaded and spray-dried and granulated on a BP-300 spray-drying granulator. The test results were:

[0016] The bulk density of the mixture pellets: 3.23g / cm 3 ;

[0017] Hall flow rate: 28.0S / 50g;

[0018] The identification result is:

[0019] Density: 14.71g / cm 3 ; Hardness: HRA89.7;

[0020] Bending strength TRS.: 2860N / mm 2 ; Coercivity Hc: 11.6KA / m;

[0021] Cobalt Magnetic Com: 7.33%; Porosity A02B00C00.

Embodiment 2

[0022] Example 2: Using fine particle WC powder (FSSS. particle size 1.5 μm, total carbon 6.18%) and cobalt powder (FSSS. particle size 1.5 μm) as the main raw materials, the batching ratio is 94.0wt% WC+6.0wt% Co+0.20wt %TaC, plus 2.2wt% Wax, add 300ml / kg of mixed material alcohol as a wet grinding medium, add 0.15wt% oleic acid and 0.085wt% stearic acid to the mixed slurry. The above-mentioned substances were ball-milled in a 300L tilting ball mill with a rotation speed of 36 rpm, a filling factor of 0.45, and a ball-to-material ratio of 4:1. After 54 hours of wet milling, the slurry was discharged, and spray-dried and granulated on a BP-300 spray-drying granulator. The test results were:

[0023] Bulk density of mixture pellets: 3.70g / cm 3 ;

[0024] Hall flow rate: 20.0S / 50g;

[0025] The identification result is:

[0026] Density: 15.0g / cm 3 ; Hardness: HRA91.8;

[0027] Bending strength TRS.: 2156N / mm 2 ; Coercivity Hc: 18.5KA / m;

[0028] Cobalt Magnetic Com: 5.3...

Embodiment 3

[0029] Example 3: Using fine particle WC powder (FSSS. particle size 16.4 μm, total carbon 6.13%) and cobalt powder (FSSS. particle size 1.5 μm) as the main raw materials, the batching ratio is 84.9wt%WC+15.1wt%Co+0.20wt %TaC, plus 2.0wt% Wax, add 225ml / kg of mixed material alcohol as wet grinding medium, add 0.02wt% oleic acid in the mixed slurry. The above-mentioned substances were ball-milled in a 300L tilting ball mill with a rotation speed of 36 rpm, a filling factor of 0.45, and a ball-to-material ratio of 4:1. After 28 hours of wet milling, the slurry was discharged, and spray-dried and granulated on a BP-300 spray-drying granulator. The test results were:

[0030] The bulk density of the mixture pellets: 3.20g / cm 3 ;

[0031] Hall flow rate: 26.0S / 50g;

[0032] The identification result is:

[0033] Density: 13.83g / cm 3 ; Hardness: HRA84.8;

[0034] Bending strength TRS.: 2120N / mm 2 ; Coercivity Hc: 5.9KA / m;

[0035] Cobalt Magnetic Com: 14.5%; Porosity A02B00C...

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Abstract

A preparation method for producing cemented carbide mixture is disclosed, the raw materials of which comprises WC powder, WC-TiC solid solution and Co powder; adopting paraffin as forming agent, absolute alcohol as the medium of rubbing and adding oleic acid and stearic acid into the rubbing medium as dispersing agent. The technical process comprises the following steps: accurate batching, loading the heated molten and filtered paraffin into a ball mill for pre-rubbing; wet milling, putting the prepared material into the ball mill, adding right amount alcohol as the ball milling medium, simultaneously, adding dispersing agent, and then turning on the machine for wet milling; slurries filterring, unloading the slurries and filtering for 200-320 meshes; spray drying and pelletizing, spray drying and pelletizing the slurries by using spray drying equipment; and sieving, producing mixture material grain suitable for various kinds of pressing requirements. The method has the advantages of short production process flow, reliable and stable product quality and high production efficiency, which is suitable for large scale production operation and can be widely used for preparing cemented carbide mixture.

Description

technical field [0001] The invention relates to a method for preparing a cemented carbide mixture, in particular to a method for preparing a cemented carbide mixture using alcohol paraffin. Background technique [0002] Cemented carbide is widely used due to its high strength and high hardness characteristics. The key to the preparation of cemented carbide is the preparation of the mixture. [0003] Now the preparation method of the mixture mainly adopts rubber technology, alcohol PEG technology, hexane paraffin technology and so on. Since paraffin wax is the most pure molding agent substance, it will not "age", has a low evaporation temperature, is easily excluded in the low-temperature sintering stage, has no ash, and will not bring impurities into the alloy. Therefore, it is used for the molding of cemented carbide agents have been widely recognized. [0004] In the prior art, paraffin wax is often used as a molding agent, and alcohol is also used as a wet grinding med...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C29/08
Inventor 张敬利刘志芳
Owner 株洲江钨博大硬面材料有限公司
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