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A kind of aln-sic porous composite ceramics based on foaming method and preparation method thereof

A technology of composite ceramics and foaming method, which is applied in the field of porous composite ceramics, which can solve the problems of uneven local chemical composition, difficulty in preparing raw materials, and affecting the performance of ceramic materials, and achieve local uniform chemical composition, high mechanical strength, and low preparation temperature Effect

Active Publication Date: 2021-02-19
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the difficulty of "thoroughly mixing" the raw materials, the AlN-SiC composite ceramics prepared by the above method often have the problem of local chemical composition inhomogeneity, which affects the performance of ceramic materials.

Method used

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  • A kind of aln-sic porous composite ceramics based on foaming method and preparation method thereof
  • A kind of aln-sic porous composite ceramics based on foaming method and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] An AlN-SiC porous composite ceramic based on a foaming method and a preparation method thereof. The preparation method described in this embodiment is:

[0030] Step 1: Press Al 4 SiC 4 Powder: the mass ratio of deionized water is 1: (0.15~0.2), to the Al 4 SiC 4 Add the deionized water to the powder and stir to obtain Al 4 SiC 4 slurry.

[0031] Step 2: According to the Al 4 SiC 4 Powder: foam stabilizer: whipping agent: the mass ratio of surfactant is 1: (0.01~0.015): (0.02~0.025): (0.01~0.0125), earlier described foam stabilizer, described whipping agent Mix with the surfactant to obtain an additive, then add deionized water 11 to 12 times as much as the additive to the additive, and stir for 3 to 5 minutes to obtain foam.

[0032] Step 3: Pour the foam into the Al 4 SiC 4 In the slurry, stir for 2 to 3 minutes, pour into the mold, stand at room temperature for 1 to 2 hours, then dry at 50 to 60°C for 18 to 24 hours, and demould to obtain Al 4 SiC 4 Poro...

Embodiment 2

[0036] An AlN-SiC porous composite ceramic based on a foaming method and a preparation method thereof. In this embodiment, except step 4, all the others are the same

[0037] Example 1:

[0038] Step 4: the Al 4 SiC 4 The porous ceramic body is placed in an atmosphere furnace, kept in a nitrogen atmosphere at 1300-1400°C for 100-250 minutes, and cooled to room temperature to obtain AlN-SiC porous composite ceramics based on the foaming method.

[0039]The foam stabilizer is sodium hydroxyethyl cellulose; the foaming agent is triethanolamine dodecyl sulfate; and the surfactant is fatty alcohol polyoxyethylene ether.

Embodiment 3

[0041] An AlN-SiC porous composite ceramic based on a foaming method and a preparation method thereof. In this embodiment, except step 4, all the others are the same

[0042] Example 1:

[0043] Step 4: the Al 4 SiC 4 The porous ceramic body is placed in an atmosphere furnace, held in a nitrogen atmosphere at 1400-1500°C for 60-200 minutes, and cooled to room temperature to obtain AlN-SiC porous composite ceramics based on the foaming method.

[0044] The foam stabilizer is hydroxyethyl cellulose; the foaming agent is polyethylene glycol; and the surfactant is Pingpinga.

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Abstract

The invention relates to an AlN-SiC porous composite ceramic based on a foaming method and a preparation method thereof. Its technical scheme is: press Al 4 SiC 4 The mass ratio of powder: deionized water is 1: (0.15~0.3) batching, stirring, to obtain Al 4 SiC 4 slurry. Then press Al 4 SiC 4 The mass ratio of powder: foam stabilizer: foaming agent: surfactant is 1: (0.01~0.025): (0.0125~0.025): (0.01~0.02), foam stabilizer, foaming agent and surfactant are mixed , add deionized water, stir to get foam. Pour foam into Al 4 SiC 4 In the slurry, stirred, left standing in the mold, dried, demoulded, kept in a nitrogen atmosphere at 1200-1500°C for 60-300min, and cooled to obtain the AlN-SiC porous composite ceramic based on the foaming method. The invention has the characteristics of simple process and low preparation temperature, and the prepared AlN-SiC porous composite ceramic has uniform local chemical composition, high mechanical strength and controllable size of the generated AlN whiskers.

Description

technical field [0001] The invention belongs to the field of porous composite ceramics. In particular, it relates to an AlN-SiC porous composite ceramic based on a foaming method and a preparation method thereof. Background technique [0002] Due to the advantages of low thermal expansion coefficient, high thermal conductivity, good thermal and chemical stability, low density and excellent mechanical properties, porous SiC ceramics are widely used in electrodes and catalyst support materials, but they have low fracture toughness. . AlN has extremely low thermal expansion coefficient, high thermal conductivity, excellent electrical insulation, low dielectric constant, and excellent high temperature resistance and corrosion resistance. It is widely used in the fields of advanced refractory materials and semiconductor materials. AlN and SiC have a good phase Capacitance. AlN whiskers are effective reinforcing materials for ceramics. They have the advantages of high aspect ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/10C04B35/581C04B35/565
CPCC04B35/565C04B35/581C04B38/10C04B2235/6567
Inventor 余超邢广超丁军邓承继祝洪喜
Owner WUHAN UNIV OF SCI & TECH
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