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Method for preparing rare earth modified ultrafine hard alloy by spark plasma sintering

A spark plasma and rare earth modification technology is applied in the field of preparing CeO2 rare earth modified ultrafine cemented carbide by sintering, which can solve the problems of difficulty in preparing ultrafine grains and long sintering time, and achieves shortening sintering time, reducing sintering time, The effect of reducing production costs

Inactive Publication Date: 2016-03-23
LONGYAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional cemented carbide sintering preparation methods include hot pressing sintering, vacuum sintering and low pressure sintering. The disadvantages are that the sintering time is long and it is difficult to prepare ultra-fine grains

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0010] Example 1: 0.6%wt.CeO 2 and nano WC-8%wt.Co composite powder into the graphite mold, and then put the graphite mold into the spark plasma sintering furnace, and apply an axial pressure of 20MPa under the condition of a vacuum degree of less than 10Pa or an inert atmosphere, to 100 ℃ / Raise the temperature at a rate of 1450°C for 15 minutes and sinter at a temperature of 1450°C, and finally cool down to below 150°C with the furnace and start the furnace to obtain CeO with uniform composition 2 Rare earth modified ultrafine cemented carbide. Its main technical performance indicators are: bending strength 3050Mpa, Rockwell hardness 93.5HRA, porosity A01B00C00.

example 2

[0011] Example 2: 0.4wt.CeO 2 and nano WC-10%wt.Co composite powder into the graphite mold, and then put the graphite mold into the spark plasma sintering furnace, and apply an axial pressure of 30MPa under the condition of a vacuum degree of less than 10Pa or an inert atmosphere. ℃ / Raise the temperature at a rate of 1 min, keep it at 1350 °C for 15 min for sintering, and finally cool down to below 150 °C with the furnace and start the furnace to obtain CeO with uniform composition 2 Rare earth modified ultrafine cemented carbide. Its main technical performance indicators are: bending strength 2380Mpa, Rockwell hardness 92.1HRA, porosity A02B02C01.

example 3

[0012] Example 3: 0.8%wt.CeO 2 and nano WC-6%wt.Co composite powder into the graphite mold, and then put the graphite mold into the spark plasma sintering furnace, and apply an axial pressure of 40MPa under the condition of a vacuum degree of less than 10Pa or an inert atmosphere. ℃ / Raise the temperature at a rate of 1400°C for 15 minutes and sinter at a temperature of 1400°C, and finally cool down to below 150°C with the furnace and start the furnace to obtain CeO with uniform composition 2 Rare earth modified ultrafine cemented carbide. Its main technical performance indicators are: bending strength 2720Mpa, Rockwell hardness 92.6HRA, porosity A02B01C00.

[0013] As can be seen from the above three examples, the CeO obtained in Example 1 2 Rare earth modified ultrafine cemented carbide has the best overall performance.

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Abstract

The invention discloses a method for preparing a CeO2 rare earth modified ultrafine hard alloy by spark plasma sintering. The method comprises the following operation steps: feeding combined powder comprising 0.4 to 0.8% by weight of CeO2 and 6 to10% by weight of nano WC-Co into a graphite die; positioning the graphite die into a spark plasma sintering furnace; applying 20 to 40MPa axial pressure under the condition that the vacuum degree is less than 10Pa or the inert atmosphere is provided; heating at the rate of 100-200 DEG C per minute; maintaining the temperature of 1350 to 1450 DEG C for 10 to 20 minutes, and then sintering; cooling with the furnace until the temperature is less than 150 DEG C; then opening the furnace to obtain the uniform-component rare earth modified ultrafine hard alloy. With the adoption of the method for preparing the rare earth modified ultrafine hard alloy, the preparation time of materials can be greatly reduced, thus the production efficiency can be greatly improved, and the product cost can be reduced.

Description

technical field [0001] The invention relates to a preparation method of cemented carbide, in particular to the preparation of CeO by sintering 2 A method for rare earth modified ultrafine cemented carbide. Background technique [0002] Traditional cemented carbide sintering preparation methods include hot pressing sintering, vacuum sintering and low pressure sintering. The disadvantages are that the sintering time is long and it is difficult to prepare ultra-fine grains. At present, there are two ways to prepare ultra-fine cemented carbide: one is to prevent grain growth by improving the sintering method, reducing the sintering temperature and shortening the sintering time; the other is to add a grain growth inhibitor to the cemented carbide . In terms of grain growth inhibitors, the application of rare earths has been paid more and more attention in recent years. The main reason is that rare earths will be distributed on the grain boundaries, which can effectively prevent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/02C22C1/05
CPCC22C29/02B22F2999/00C22C1/051B22F2003/1032B22F2202/13B22F2201/10B22F2201/20
Inventor 温德才吴鹏
Owner LONGYAN UNIV
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