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Process for sintering ceramic powder or ceramic base composite powder

A ceramic matrix composite and ceramic powder technology, which is applied in the field of ceramic powder or ceramic matrix composite powder sintering, can solve the problems of reduced material performance, high equipment cost, and short sintering time, and achieve high equipment cost and EDM equipment. Effect of cost reduction and equipment cost reduction

Inactive Publication Date: 2005-06-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the cost required for hot pressing sintering is relatively low, but the required sintering time is longer, and the prolongation of sintering time will easily cause the grain growth, thereby reducing the material performance.
The sintering time required for electric spark sintering is short, which is conducive to obtaining fine-grained and high-density materials, but the equipment cost is high
Common sintering methods have this contradiction between sintering cost and sintering quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Nano α-Al 2 o 3 Powder (average particle size 50nm) and -150 mesh Al powder were subjected to high-energy ball milling (ball milling tank speed 800 rpm, ball-material ratio 10:1) for 13.5 hours to obtain 30% vol Al-Al 2 o 3 (volume percentage) composite powder, put 1 gram of the mixture into a graphite mold with an inner diameter of Ф10mm (a thin layer of Al is deposited on the working surface of the graphite mold) 2 o 3 ), in an argon atmosphere, first raise the temperature in the sintering furnace where the powder is located to 1300°C, and give the sintered body electric spark sintering. The electric spark sintering parameters are: initial pressure is 3MPa, forming pressure is 50MPa, and current density is 420A / cm 2 , the pulse frequency of the power supply is 1200Hz, when the temperature of the sample reaches 1450°C and keep it warm for 2 minutes, turn off the electric spark sintering power supply, keep the pressure of 50MPa, and make it sinter in the temperatur...

Embodiment 2

[0016] ZrO 2 Powder (average particle size 10nm), Y 2 o 3 powder (average particle size 20nm), -300 mesh Ca powder through high-energy ball milling (ball milling tank speed 875 rpm, ball-to-material ratio 15:1) for 20 hours to get 17% vol Ca-3% vol Y 2 o 3 -ZrO 2 Composite powder, then add 30% vol (volume percentage) water glass to the composite powder and fully mix, 1.5 grams of mixture is packed into the graphite mold with an inner diameter of Ф8mm (a thin layer of Al is deposited on the working surface of the graphite mold) 2 o 3 ), raise the temperature in the sintering furnace where the powder is located to 1000°C under nitrogen atmosphere, and then give the sintered body electric spark sintering. The electric spark sintering parameters are: initial pressure is 2MPa, forming pressure is 47MPa, and current density is 400A / cm 2 , the power pulse frequency is 1100Hz, when the temperature of the sample reaches 1250°C and keep it warm for 2 minutes, turn off the electri...

Embodiment 3

[0018] Add 0.5%wt (weight percent) VC powder (average particle size 50nm) to Co-wrapped WC powder (average particle size 100nm, Co accounted for 20%wt) and mix well, and put 1.2 grams of the mixture into a graphite mold with an inner diameter of Ф10mm Medium (the working surface of the graphite mold is clad with a thin layer of SiO 2 ), raise the temperature in the sintering furnace to 1000°C under the argon atmosphere; then give the powder the electric spark sintering, the electric spark sintering parameters are: the initial pressure is 3.2MPa, the forming pressure is 45MPa, and the current density is 380A / cm 2 , the power pulse frequency is 1150Hz, when the temperature of the sample reaches 1200°C and keep it warm for 2 minutes, turn off the electric spark sintering power supply, keep the pressure of 45MPa and cool with the furnace, the density of the obtained sample is higher than that obtained by simply hot pressing sintering (heating temperature, applied pressure and Th...

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Abstract

The invention provides a process for sintering ceramic powder or ceramic base composite powder which comprises, subjecting ceramic powder or ceramic base composite powder to heating, pressurizing, compound sintering with sparks with the sintering being controllable, i.e. air or vacuum or argon or nitrogen atmosphere. The invention realizes the effects of short time and low cost.

Description

technical field [0001] The invention relates to the fields of ceramic materials, ceramic matrix composite material sintering and the like, in particular to a method for sintering ceramic powder or ceramic matrix composite powder. Background technique [0002] Ceramics or ceramic matrix composites have many high-quality properties unmatched by other materials, such as high hardness, corrosion resistance, wear resistance, high temperature resistance, aging resistance, etc., and can be applied in harsh environmental conditions that many other materials cannot withstand. Therefore, the sintering preparation process of ceramics and ceramic matrix composites has always attracted people's attention. [0003] At present, there are many sintering methods for ceramics and ceramic matrix composites, such as pressureless sintering, hot pressing sintering, hot isostatic pressing sintering, electric spark sintering, explosive sintering, etc. Among them, the cost required for hot pressing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/645
Inventor 王茂才李华玲刘伟军
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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