Hard alloy sintering process and degumming and vacuum sintering integrated furnace

A cemented carbide and vacuum sintering technology, which is applied in furnaces, muffle furnaces, cooking furnaces, etc., can solve the problems of not being suitable for sintering of fine-grained products, large investment in equipment costs, and long production time, so as to reduce sintering costs, Low equipment cost and the effect of improving sintering quality

Inactive Publication Date: 2009-12-09
株洲楚天硬质合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of its technology, the total production time is long, about 20 hours in the whole process; the investment in equipment is large, and the requirements for the production site (floor height) are high; because hydrogen is a flammable and explosive gas, it is easy to Causes explosion, low safety factor; after degumming, the semi-finished product is exposed to the air to cool, and the fine-grained carbides are easily oxidized, so it is not suitable for sintering of fine-grained products; high energy consumption; low production efficiency

Method used

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  • Hard alloy sintering process and degumming and vacuum sintering integrated furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The first step, forming

[0030] According to the shape of the workpiece, take YG8 cemented carbide powder and resin glue to mix, press molding;

[0031] The second step, degumming

[0032] Put the formed workpiece in the first step into the furnace, evacuate and maintain the vacuum in the furnace at 75Pa, start the glue pump, control the heating rate of 1°C / min, raise the temperature to 330°C, and keep it for 50min to vaporize the adhesive; then, continue to heat up To 650 ℃, keep warm for 50 minutes, so that the remaining adhesive gas in the furnace is cracked, and the degumming is completed;

[0033] The third step, sintering

[0034] After the second step, continue to evacuate to 140Pa, raise the temperature to 1410°C at the same time, keep the heat for 50min, and control the heating rate at 2°C / min to complete the sintering.

[0035] After testing, the performance parameters of the obtained product are: porosity: A02, B00 grade; non-combined carbon content: C00 ...

Embodiment 2

[0037] The first step, forming

[0038] According to the shape of the workpiece, take YG8 cemented carbide powder and resin glue to mix, press molding;

[0039] The second step, degumming

[0040] Put the formed workpiece in the first step into the furnace, evacuate and maintain the vacuum in the furnace at 80Pa, start the glue pump, control the heating rate of 1.5°C / min, raise the temperature to 340°C, and keep it for 65min to vaporize the adhesive; then, continue to heat up To 640 ℃, keep warm for 65 minutes, so that the remaining adhesive gas in the furnace is cracked, and the degumming is completed;

[0041] The third step, sintering

[0042] After the second step, continue to evacuate to 150Pa, and at the same time raise the temperature to 1450°C, keep the temperature for 60min, and control the heating rate at 5°C / min to complete the sintering.

[0043] After testing, the performance parameters of the obtained product are: porosity: A02, B00 grade; non-combined carbon ...

Embodiment 3

[0045] The first step, forming

[0046] According to the shape of the workpiece, YG10x cemented carbide powder and resin glue are mixed and pressed into shape;

[0047] The second step, degumming

[0048] Put the formed workpiece in the first step into the furnace, evacuate and maintain the vacuum in the furnace at 85Pa, start the glue pump, control the heating rate of 2°C / min, raise the temperature to 350°C, and keep it for 80min to vaporize the adhesive; then, continue to heat up To 660 ℃, keep warm for 80 minutes, so that the remaining adhesive gas in the furnace is cracked, and the degumming is completed;

[0049] The third step, sintering

[0050] After the second step, continue to evacuate to 160Pa, raise the temperature to 1480°C at the same time, keep the temperature for 70min, and control the heating rate at 8°C / min to complete the sintering.

[0051] After testing, the performance parameters of the obtained product are: porosity: A02, B00 grade; non-combined carbo...

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Abstract

A hard alloy sintering process comprises the following steps: filling moulded workpiece in a sintering chamber, starting vacuum pump to vacuumize and starting glue pump, raising temperature to 330 to 350 DEG C, making adhesive gasify, at the same time, pumping the gasified adhesive gas from sintering chamber by glue pump, and then, continuously raising temperature to 630 to 660 DEG C, making furnace-residual adhesive gas crack, after finishing degumming, continuously vacuumizing to 140 to 160 Pa and raising temperature to 1410 to 1480 DEG C, at last finishing sintering. The degumming and vacuum sintering integrated furnace of the invention comprises: a furnace, a heat preservation box, a sintering chamber, an adhesive tank, a glue pump and a vacuum pump. The invention has rational design, simple device structure, convenient operation and integration of degumming and vacuum sintering for effectively improving the product sintering quality, shortening sintering period, saving energy resource and reducing product sintering cost. The furnace is a novel product fit for replacing the current hard alloy sintering device because of wide sintering product range, low device cost and safe production process.

Description

technical field [0001] The invention relates to the field of cemented carbide sintering technology and equipment, in particular to a cemented carbide sintering process and a degumming vacuum sintering integrated furnace. Background technique [0002] The traditional cemented carbide sintering process generally adopts two processes. One process is to directly heat the cemented carbide blank to 1400-1450 ° C in a vacuum sintering furnace for sintering; the other process is to place the cemented carbide blank in a vacuum sintering furnace. In the degumming heating furnace, the temperature is gradually raised to about 800°C, and the heat is kept. At the same time, an air inlet and an air outlet are set on the furnace body, and hydrogen is introduced into the furnace through the air inlet, and the hydrogen discharged is ignited at the outlet. The degree of degumming can be judged by the color of hydrogen combustion flame; after degumming, it is cooled to room temperature, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16F27B5/05F27B5/06F27B5/13F27B5/14F27B5/18
Inventor 唐迎春
Owner 株洲楚天硬质合金股份有限公司
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