Preparation method of heterogeneous core-shell structure toughening agent, aluminum oxide ceramic material and preparation method and application of aluminum oxide ceramic material

A technology of alumina ceramics and shell structure, which is applied in the field of ceramic materials to achieve the effects of inhibiting the abnormal growth of grains, good toughness, and improving the compactness of ceramics

Active Publication Date: 2021-06-01
新化县新天地精细陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a large number of literatures have reported that the addition of rare earth oxides can significantly enhance the physical properties of ceramic materials (such as hardness, strength, or toughness, etc.), few literatures have reported the theory that special composite structures such as core-shell structures synergistically toughen alumina ceramics. Research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]Embodiment 1: Preparation of heterogeneous core-shell structure toughening agent

[0039] A preparation method of multi-component rare earth oxide-nano-alumina composite heterogeneous core-shell structure toughening agent, comprising the following steps:

[0040] 1) Rare earth metal nitrate, deionized water, and absolute ethanol are prepared into a rare earth cation mixed solution with a mass concentration of 25%; the mass ratio of deionized water and absolute ethanol is 1:1.

[0041] The rare earth metal nitrate is a mixture of yttrium nitrate, cerium nitrate and lanthanum nitrate; the molar ratio of yttrium nitrate, cerium nitrate and lanthanum nitrate is 1:0.3:0.6.

[0042] 2) Pour the nano-alumina powder with an average particle size of 50nm into the rare earth cation mixed solution, the mass ratio of the nano-alumina powder and the rare earth cation mixed solution is 1:0.5; after fully mixing, ball mill for 1.5 hours; then, the obtained The suspension was dried in ...

Embodiment 2

[0044] Example 2: Preparation of heterogeneous core-shell structure toughening agent

[0045] A preparation method of multi-component rare earth oxide-nano-alumina composite heterogeneous core-shell structure toughening agent, comprising the following steps:

[0046] 1) Rare earth metal nitrate, deionized water, and absolute ethanol are prepared into a rare earth cation mixed solution with a mass concentration of 20%; the mass ratio of deionized water and absolute ethanol is 1:1.5.

[0047] The rare earth metal nitrate is a mixture of yttrium nitrate, cerium nitrate and lanthanum nitrate; the molar ratio of yttrium nitrate, cerium nitrate and lanthanum nitrate is 1:0.2:0.7.

[0048] 2) Pour the nano-alumina powder with an average particle size of 75nm into the rare earth cation mixed solution, and the mass ratio of the nano-alumina powder to the rare earth cation mixed solution is 1:0.4; after fully mixing, ball mill for 1 hour; then, the obtained The suspension was dried in ...

Embodiment 3

[0050] Embodiment 3: the preparation of alumina ceramic material

[0051] An alumina ceramic material is made of the following raw materials in weight percentage: white wax 12.4%, beeswax 0.1%, and the balance is powder;

[0052] The powder is composed of the following raw materials by weight percentage: heterogeneous core-shell structure toughening agent (prepared by the method in Example 1) 2%, kaolin 0.02%, silicon dioxide 0.018%, calcium carbonate 0.035%, oleic acid 5% %, the balance is aluminum oxide.

[0053] The preparation method comprises the following steps:

[0054] 1) Ball milling treatment: put the powder into an aluminum pan and bake in an oven for 10 hours at a temperature of 150°C; put it in a ball mill and mill for 18 hours;

[0055] 2) Wax cake production: Put white wax, beeswax and the powder obtained by step 1) into the mixing bucket, heat to 100°C, stir for 2 hours, release it, pass through a 50-mesh sampling sieve, and put it in a stainless steel plate ...

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Abstract

The invention discloses a preparation method of a heterogeneous core-shell structure toughening agent, an aluminum oxide ceramic material as well as a preparation method and application. The preparation method of the heterogeneous core-shell structure toughening agent comprises the following steps: 1) preparing rare earth metal nitrate, deionized water and absolute ethyl alcohol into a rare earth cation mixed solution with a certain concentration; (2) pouring nano aluminum oxide powder into the rare earth cation mixed solution, fully mixing and then carrying out ball milling; then, drying the obtained suspension in a vacuum oven to remove water and ethanol; and 3) grinding and refining the dried powder, sieving, and calcining in a muffle furnace to obtain the heterogeneous core-shell structure toughening agent. Raw materials of the aluminum oxide ceramic material contain a heterogeneous core-shell structure toughening agent. The prepared toughening agent can effectively improve the toughness, strength and the like of the aluminum oxide ceramic material, the material processing performance is good, and the ceramic product yield is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a preparation method of a heterogeneous core-shell structure toughening agent, an alumina ceramic material, a preparation method and an application. Background technique [0002] Due to its strong hardness, low expansion coefficient, insulation, wear resistance, and corrosion resistance, alumina ceramics are widely used in machinery manufacturing, precision instruments, petrochemicals, aerospace, and electronic communications. However, alumina ceramic materials generally have a relatively large elastic modulus, high hardness, high brittleness, and strong crack sensitivity. Therefore, during the processing process, ceramic chipping often occurs, and the product yield decreases, resulting in increased production difficulty and cost. Therefore, toughening alumina ceramics to reduce the difficulty of machining and improve machining accuracy is of great significa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/10C04B35/622C04B35/63G02B6/38
CPCC04B35/10C04B35/622C04B35/6303G02B6/38C04B2235/443C04B2235/349C04B2235/3418C04B2235/442C04B2235/3244C04B2235/3232C04B2235/3262
Inventor 辛绍文文瑾
Owner 新化县新天地精细陶瓷有限公司
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