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Method for preparing WC-Co cemented carbide through microwave sintering

A cemented carbide and microwave sintering technology, applied in the field of microwave preparation of WC-Co cemented carbide, can solve the problems of complex process flow, long production cycle and high cost, and achieve simple production process, short production cycle and low energy consumption. Effect

Inactive Publication Date: 2012-03-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually vacuum sintering, low pressure sintering and other methods are used to prepare WC-Co cemented carbide. The prepared WC-Co alloy has the characteristics of high relative density and good comprehensive performance. However, this kind of sintering method has long production cycle, complicated process and energy consumption. Disadvantages such as large size and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first step: mix the WC powder with a purity greater than 99.9% and a Fischer particle size of 6.0-7.0 microns, and the Co powder with a purity greater than 99.9% and a Fischer particle size of 1-2 microns according to the mass percentage of WC-6Co, and use a planetary ball mill to Mix in anhydrous ethanol medium for 8 hours and then dry to obtain the WC-Co mixture with a rotation speed of 150 rpm and a ball-to-material ratio of 2:1;

[0023] The second step: Add gasoline solution dissolved with Buna rubber to the mixture, vacuum dry, sieve, and press under 500MPa pressure into cylindrical samples with a diameter of 18mm and a length, width and height of 42mm, 6.5mm, and 6.5mm respectively. mm rectangular parallelepiped flexural specimen, then heated to 500°C in a hydrogen furnace, and degummed for 8 hours; the gasoline solution was dissolved with 0.6% of the mass of Buna-Na rubber in the mixture;

[0024] Step 3: Place the degummed compact and 80g of SiC auxiliary h...

Embodiment 2

[0028] The first step: mix the WC powder with a purity greater than 99.9% and a Fischer particle size of 6.0-7.0 microns, and the Co powder with a purity greater than 99.9% and a Fischer particle size of 1-2 microns according to the mass percentage of WC-23Co, and use a planetary ball mill to Mix in anhydrous ethanol medium for 7 hours and then dry to obtain a WC-Co mixture with a rotation speed of 120rpm and a ball-to-material ratio of 2:1;

[0029] Step 2: Add gasoline solution dissolved with Buna-Na rubber to the mixture, vacuum dry, sieve, and press under 200MPa pressure to form a cylindrical sample with a diameter of 18mm and a length, width and height of 42mm×6.5mm×6.5mm The rectangular parallelepiped anti-bending sample is then heated to 550 ° C in a hydrogen furnace for degumming for 7 hours; the gasoline solution is dissolved with 0.7% of the mass of the mixed material butadiene rubber;

[0030] Step 3: Place the degummed compact and 80g of SiC auxiliary heating mater...

Embodiment 3

[0034]The first step: mix the WC powder with a purity greater than 99.9% and a Fischer particle size of 6.0-7.0 microns, and the Co powder with a purity greater than 99.9% and a Fischer particle size of 1-2 microns according to the mass percentage of WC-8Co, and use a planetary ball mill to Mix in the absolute ethanol medium for 8 hours and then dry to obtain the WC-Co mixture with a rotation speed of 150 rpm and a ball-to-material ratio of 2:1;

[0035] The second step: Add the gasoline solution dissolved with Buna rubber to the mixture, vacuum dry, sieve, and press under the pressure of 400MPa to form a cylindrical sample with a diameter of 18mm and a length, width and height of 42mm, 6.5mm, and 6.5mm respectively. mm rectangular parallelepiped bending specimen, then heated to 600°C in a hydrogen furnace, and degummed for 6 hours; the gasoline solution was dissolved with 0.8% of the mass of the mixture; butadiene rubber;

[0036] Step 3: Place the degummed compact and 160g o...

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Abstract

The invention provides a method for preparing WC-Co cemented carbide through microwave sintering. The method comprises the steps of WC powder and Co powder batching and mixing, compacting and sintering, wherein in the step of sintering, compacts, SiC chips, carbon black and alumina powder are put in an alumina fiber insulating bag sleeve and then the alumina fiber insulating bag sleeve is put in a microwave high temperature furnace, the products in the furnace are heated to 500-600 DEG C at a heating speed of 5-10 DEG C / min and the heat is preserved and then the products are heated to 1400-1500 DEG C at a heating speed of 30-80 DEG C / min and the heat is preserved, thus obtaining the WC-Co cemented carbide. The method has the advantages of simple process, convenience in operation, short sintering period and low energy consumption, can replace the existing WC-Co cemented carbide processes, is used for producing the WC-Co cemented carbide by adopting the intermittent or continuous microwave sintering mode and is suitable for industrial application. The prepared WC-Co cemented carbide has excellent performances.

Description

Technical field: [0001] The invention discloses a method for preparing WC-Co hard alloy by microwave. The invention belongs to the technical field of microwave application and cemented carbide preparation. technical background: [0002] Cemented carbide is produced by powder metallurgy and consists of refractory metal compounds (WC, TiC, etc.) Characteristic cermet materials. Cemented carbide is widely used in various cutting tools, rock drilling tools, wear-resistant parts, forming molds, etc. due to its good wear resistance, deformation resistance, impact resistance, and corrosion resistance. Usually vacuum sintering, low pressure sintering and other methods are used to prepare WC-Co cemented carbide. The prepared WC-Co alloy has the characteristics of high relative density and good comprehensive performance. However, this kind of sintering method has long production cycle, complicated process and energy consumption. disadvantages such as large size and high cost. Inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/08
Inventor 易健宏鲍瑞张浩泽彭元东李丽娅李爱坤
Owner CENT SOUTH UNIV
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