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Phase inversion method for preparing silicon nitride ceramic material with fiber monolithic structure

A technology of silicon nitride ceramics and phase inversion method, which is applied in the direction of ceramic forming machines and manufacturing tools, can solve the problems of low fracture toughness, achieve high production efficiency, facilitate subsequent arrangement, and overcome the effects of low fracture toughness

Pending Publication Date: 2021-12-31
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the present invention proposes a method for preparing a fiber monolithic silicon nitride ceramic material by a phase inversion method, and prepares the obtained Si 3 N 4 The fiber monolithic ceramic material has the characteristics of a fiber monolithic structure imitating a bamboo-wood structure, which overcomes the shortcomings of the existing silicon nitride-based ceramic materials with low fracture toughness

Method used

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  • Phase inversion method for preparing silicon nitride ceramic material with fiber monolithic structure
  • Phase inversion method for preparing silicon nitride ceramic material with fiber monolithic structure
  • Phase inversion method for preparing silicon nitride ceramic material with fiber monolithic structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 A preparation method of fiber monolithic silicon nitride ceramics prepared by a phase inversion method

[0034] The method includes the following steps:

[0035] (1) Weigh 65wt.% of Si 3 N 4 powder, 25wt.% BN powder and 10wt.% sintering aid 【Y 2 o 3 +Al 2 o 3 ,m(Y 2 o 3 ): m(Al 2 o 3 )=2], using a planetary ball mill for wet ball milling for 18 hours at a speed of 200r / min, then drying in an oven at 70°C, and passing the dried ceramic powder through a 100-mesh sieve for use.

[0036] (2) Use polyethersulfone (PES) as the polymer matrix binder, N-methylpyrrolidone (NMP) as the solvent, add a certain amount of PES into the NMP, stir until it is completely dissolved, as a polymer solution, The concentration of the polymer solution was 0.10 g / mL.

[0037] (3) 20wt.% rare earth silicate Yb 2 Si 2 o 7 The powder, 2wt.% methylcellulose binder and deionized water or alcohol were ball milled for 18 hours at a rotation speed of 260r / min to obtain a rare eart...

Embodiment 2

[0046] Example 2 A preparation method of fiber monolithic silicon nitride ceramics prepared by a phase inversion method

[0047] The method includes the following steps:

[0048] (1) Weigh 70wt.% Si 3 N 4 powder, 10wt.% BN powder and 20wt.% sintering aid 【Y 2 o 3 +Al 2 o 3 ,m(Y 2 o 3 ): m(Al 2 o 3 )=3], using a planetary ball mill for wet ball milling for 24 hours at a speed of 100r / min, and then drying in an oven at 100°C, and passing the dried ceramic powder through a 200-mesh sieve for use.

[0049] (2) Use polyethersulfone (PES) as the polymer matrix binder, N-methylpyrrolidone (NMP) as the solvent, add a certain amount of PES into the NMP, stir until it is completely dissolved, as a polymer solution, The concentration of the polymer solution was 0.25 g / mL.

[0050] (3) 5wt.% rare earth silicate powder Y 2 SiO 5 +Yb 2 Si 2 o 7 (where Y 2 SiO 5 and Yb 2 Si 2 o 7 The mass ratio is 1:1) and 5wt.% of methylcellulose binder and deionized water or alcohol ba...

Embodiment 3

[0056] Example 3 A preparation method for preparing fiber monolithic silicon nitride ceramics by a phase inversion method

[0057] The method includes the following steps:

[0058] (1) Weigh 48wt.% of Si 3 N 4 powder, 45wt.% BN powder and 15wt.% sintering aid 【Y 2 o 3 +Al 2 o 3 ,m(Y 2 o 3 ): m(Al 2 o 3 )=1.5], using a planetary ball mill for wet ball milling for 6 hours at a speed of 360r / min, then drying in an oven at 50°C, and passing the dried ceramic powder through a 40-mesh sieve for use.

[0059] (2) Use polyethersulfone (PES) as the polymer matrix binder, N-methylpyrrolidone (NMP) as the solvent, add a certain amount of PES into the NMP, stir until it is completely dissolved, as a polymer solution, The concentration of the polymer solution was 0.05 g / mL.

[0060] (3) 10wt.% rare earth silicate powder Ho 2 SiO 5 +Lu 2 SiO+Er 2 SiO 5 (The mass ratio of the three is 1:1:

[0061] 1) and 0.5wt.% methylcellulose binder and deionized water or alcohol ball mil...

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Abstract

The invention belongs to the technical field of high-temperature ceramic materials, particularly relates to a phase inversion method for preparing a silicon nitride ceramic material with a fiber monolithic structure, and develops a simple and effective phase inversion method by taking Si3N4 ceramic as a cell body material and rare earth silicate (RE2SiO5, RE2Si2O7 and RE is rare earth element) as a novel cell interface material, the Si3N4 fiber monolithic ceramic material with the bamboo-wood-like structure is successfully prepared, and the defect that an existing silicon nitride-based ceramic material is low in fracture toughness is overcome. The preparation method disclosed by the invention is simple and efficient in process, and the diameter of the ceramic fiber and the thickness of the interface layer are adjustable and controllable; the prepared fiber blank has certain flexibility and strength, and subsequent arrangement is facilitated; in the process of preparing the silicon nitride ceramic with the fiber monolithic structure by adopting a phase inversion method, a method of cold isostatic pressing and pressureless sintering can be adopted, the production efficiency is high, and a plurality of samples can be prepared at the same time.

Description

technical field [0001] The invention belongs to the technical field of high-temperature wave-transmitting ceramic materials, and in particular relates to the preparation of fiber monolithic silicon nitride ceramic materials by a phase inversion method. Background technique [0002] Ceramic materials have become one of the main candidate materials in the field of high-temperature wave transmission due to their excellent high-temperature properties. At present, the common high-temperature wave-transparent ceramics mainly include silicon nitride (Si 3 N 4 ), boron nitride (BN), aluminum oxide (Al 2 o 3 ), quartz and phosphate ceramics, etc. Compared with other ceramic materials, Si 3 N 4 Ceramics have excellent comprehensive properties. It not only has high strength and modulus, good thermal shock resistance, excellent rain erosion resistance, but also has high thermal stability, good high-temperature mechanical properties and high-temperature oxidation resistance. etc.,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/645C04B35/64C04B35/622B28B3/00B28B3/20C04B41/87
CPCC04B35/62272C04B35/584C04B35/593C04B35/64B28B3/003B28B3/20C04B41/87C04B41/009C04B41/5024C04B2235/3821C04B2235/3225C04B2235/3217C04B2235/3224C04B41/4584C04B41/4539
Inventor 郑丽雅李斌田志林涂傲
Owner SUN YAT SEN UNIV
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