High-pressure sintering combined die and high-pressure rapid sintering method for preparing nanometer ceramic thereof

A combined mold and high-pressure sintering technology, which is applied in the direction of ceramic molding machines and manufacturing tools, can solve the problems of low-temperature and rapid densification sintering

Inactive Publication Date: 2012-03-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, the existing sintering technology for the preparation of nano-bulk ceramics cannot achieve both low temperature and rapid densification sintering

Method used

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  • High-pressure sintering combined die and high-pressure rapid sintering method for preparing nanometer ceramic thereof
  • High-pressure sintering combined die and high-pressure rapid sintering method for preparing nanometer ceramic thereof
  • High-pressure sintering combined die and high-pressure rapid sintering method for preparing nanometer ceramic thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Pre-preparation of high-pressure sintering composite mold

[0026] (1) The high-performance graphite material provided by Shanghai Toyo Carbon Co., Ltd. is processed into a through hole with a thermocouple inserted. The size is: The outer mold 1, the size is: The inner mold 5 and its dimensions are: The outer pressure head 2; the Ni-based ultra-high temperature alloy of model GH3030 is processed into a size of: metal laminations 4.

[0027] (2) SiC, AlN and Lu with a mass ratio of 80:15:5 after ball mill mixing by plasma activation sintering method 2 o 3 The powder is sintered under the sintering conditions of heating rate of 300°C / min, sintering temperature of 1600°C, sintering pressure of 40MPa, sintering holding time of 5min and vacuum degree of 12Pa to form the following sizes: with The discs are used as ceramic laminations 3 and internal pressure heads 6 respectively after grinding and flattening.

[0028] (2) High-pressure rapid sintering method o...

Embodiment 2

[0032] (1) Pre-preparation of high-pressure sintering composite mold

[0033] (1) The high-performance graphite material provided by Shanghai Toyo Carbon Co., Ltd. is processed into a through hole with a thermocouple inserted into the following dimensions: The outer mold 1, the size is: The inner mold 5 and its dimensions are: The outer pressure head 2; the Ni-based ultra-high temperature alloy of the model GH3030 is processed into a size of: metal laminations 4.

[0034] (2) Using hot pressing sintering method (equipment adopts High-Multi-5000 multi-functional furnace), SiC, AlN and Lu with a mass ratio of 80:15:5 after ball mill mixing 2 o 3 The powders were sintered at a sintering temperature of 1850°C, a holding time of 60min, a pressure of 40MPa and a nitrogen atmosphere to form the following sizes: with The wafers are used as ceramic laminations 3 and internal pressure heads 6 respectively after grinding and flattening.

[0035] (2) High-pressure rapid sinte...

Embodiment 3

[0039] (1) Pre-preparation of high-pressure sintering composite mold

[0040] (1) The high-performance graphite material provided by Shanghai Toyo Carbon Co., Ltd. is processed into a through hole with a thermocouple inserted into the following dimensions: The outer mold 1, the size is: The inner mold 5 and its dimensions are: The outer pressure head 2; the Co-based ultra-high temperature alloy of the model ECY768 is processed into a size of: metal laminations 4.

[0041] (2) SiC, AlN and Lu with a mass ratio of 80:15:5 after ball mill mixing by spark plasma sintering (SPS) method 2 o 3 The powder is sintered under the sintering conditions of heating rate of 300°C / min, sintering temperature of 1600°C, sintering pressure of 40MPa, sintering holding time of 5min and vacuum degree of 12Pa to form the following sizes: with The wafers are used as ceramic laminations 3 and internal pressure heads 6 respectively after grinding and flattening.

[0042] (2) High-pressure r...

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Abstract

The invention discloses a high-pressure sintering combined die, which comprises a hollow cylindrical outer die, a hollow cylindrical inner die, one pair of cylindrical inner pressure heads, one pair of cylindrical metallic laminations, one pair of cylindrical ceramic laminations and one pair of cylindrical outer pressure heads, wherein the side face of the outer die is provided with a through hole into which a thermocouple is inserted; the hollow cylindrical inner die is arranged in the hollow cavity body of the outer die; the side face of the inner die is provided with a blind hole into which the thermocouple is inserted; the outer die and the inner die are in close fit, and the centre line of the through hole into which the thermocouple is inserted on the side face of the outer die and the centre line of the blind hole into which the thermocouple is inserted on the side face of the inner die coincide; the cylindrical inner pressure heads are half inserted into the upper end and the lower end of the hollow cavity body of the inner die; the inserted inner pressure heads and the hollow cavity body of the inner die form a die cavity; the cylindrical metallic laminations are arranged outside the inner pressure heads; the cylindrical ceramic laminations are arranged outside the cylindrical metallic laminations; the cylindrical outer pressure heads are arranged outside the cylindrical ceramic laminations; and the ceramic laminations and the outer pressure heads are in the close fit with the outer die. The invention also discloses a high-pressure rapid sintering method for preparing a nanometer ceramic by adopting the die. By adopting the die and the sintering method disclosed by the invention, the rapid low-temperature compact sintering can be realized on a nanometer ceramic material.

Description

technical field [0001] The invention relates to the technical field of rapid sintering of ceramic materials, in particular to a high-pressure sintering mold and a high-pressure rapid sintering method for preparing nano ceramics. Background technique [0002] Ceramic or metal powder pressure sintering molds are generally made of high-performance graphite or refractory metal materials due to the general requirements for high-temperature mechanical properties and thermal conductivity. Obviously, only using graphite or refractory metal materials at a certain sintering temperature obviously cannot withstand high pressure or ultra-high pressure sintering of hundreds of MPa or even more than 1GPa. [0003] Regarding sintering molds, ZL200920034468.7 "A constrained pre-sintering mold for preparing TiAl-based alloys" and 201110040207.8 "A constrained sintering mold for controlling sintering deformation defects of powder metallurgy blanks" are neither pressurized or high-pressure sint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B7/42B22F3/14C04B35/64
Inventor 刘桂武乔冠军简文政金海云史忠旗王继平杨建锋王红洁
Owner XI AN JIAOTONG UNIV
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