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Alpha-Al2O3 ceramic particles containing lamellar microcrystals as well as preparation method for ceramic particles and application of ceramic particles

A technology of ceramic particles and microcrystals, which is applied in the field of inorganic non-metallic materials, can solve the problems of poor controllability of microcrystalline alumina ceramic particle size, high production cost of ultrafine aluminum hydroxide, cumbersome and lengthy process steps, etc., and achieve crystal shape Good appearance controllability, simple and easy-to-control preparation method, good industrialization prospect

Inactive Publication Date: 2016-06-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the main raw materials in the preparation method of the above-mentioned microcrystalline alumina ceramic particles are two kinds of ultrafine aluminum hydroxide and pseudoboehmite, wherein the preparation cost of ultrafine aluminum hydroxide is relatively high, and it can only be obtained through a special grinding process; In addition, it is necessary to prepare α-alumina first, so there are two calcination steps in the whole process, and two long grinding steps are required, the process steps are cumbersome and lengthy
The prepared microcrystalline alumina ceramics have poor particle size controllability and a polyhedral-like morphology.
[0005] At present, the magnetoplumbite-type hexaaluminate is mostly synthesized by the solid phase method, and the firing temperature is generally 1600 °C. There are also some precursors synthesized by the micro-suspension method that can be fired at 1400 °C, but the preparation method itself has limitations. Difficult to achieve industrial production

Method used

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  • Alpha-Al2O3 ceramic particles containing lamellar microcrystals as well as preparation method for ceramic particles and application of ceramic particles
  • Alpha-Al2O3 ceramic particles containing lamellar microcrystals as well as preparation method for ceramic particles and application of ceramic particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1, α-A1 containing flaky microcrystals 2 o 3 Preparation of Ceramic Particles

[0038] (1) Add 200.0g of pseudo-boehmite filter cake to 2.0kg of deionized water, stir and disperse to form pseudo-boehmite suspension; mix 8.0g of lanthanum nitrate hexahydrate, 5.0g of magnesium nitrate hexahydrate, 0.1g of hexahydrate Cobalt nitrate and 10.0 g of nitric acid (65 wt %) were added into 200.0 g of deionized water to prepare a solution; the obtained aqueous solution was added to the pseudo-boehmite suspension, mixed and dispersed uniformly to obtain a slurry;

[0039] (2) hydrothermally reacting the slurry obtained in step (1) at 200° C. for 36 hours to obtain a gel;

[0040] (3) Dry the gel obtained in step (2) in an oven at 80°C to obtain dry gel particles, pulverize them with a universal grinder, and sieve to obtain particles with a mesh size of 120 or more. Under vacuum (-0.05MPa) Slowly raise the temperature to 1500°C at a rate of 2.0°C / min, and keep it at the...

Embodiment 2

[0042] Example 2, α-A1 containing flaky microcrystals 2 o 3 Preparation of Ceramic Particles

[0043] As described in Example 1, the difference is that in step (3), the gel is dried at 80°C to obtain dry gel particles, pulverized with a universal pulverizer, and sieved to obtain particles with a mesh size of 120 or more. Slowly increase the temperature to 1600°C at a rate of 1 / min, and keep it at the target temperature for 3 hours to obtain α-A1 containing flaky crystallites 2 o 3 ceramic particles.

[0044] The resulting α-A1 2 o 3 The hardness of the microcrystalline ceramic particles is 19.5GPa, and the ball-milling toughness is 75%.

Embodiment 3

[0045] Example 3, α-A1 containing flaky microcrystals 2 o 3 Preparation of Ceramic Particles

[0046] As described in Example 1, the difference is that in step (3), the gel is dried at 80°C to obtain dry gel particles, pulverized with a universal pulverizer, and sieved to obtain particles with a mesh size of 120 or more. Slowly increase the temperature to 1450°C at a rate of 1 / min, and keep it at the target temperature for 3 hours to obtain α-A1 containing flaky crystallites 2 o 3 ceramic particles.

[0047] The resulting α-A1 2 o 3 The hardness of the microcrystalline ceramic particles is 18.5GPa, and the ball-milling toughness is 78%.

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Abstract

The invention relates to alpha-Al2O3 ceramic particles containing lamellar microcrystals as well as a preparation method for the ceramic particles and an application of the ceramic particles. The alpha-Al2O3 ceramic particles comprises magnetoplumbite lamellar crystals and aluminum oxide crystals, and the magnetoplumbite lamellar crystals are inserted in the aluminum oxide crystals in a penetration manner. The specific preparation method comprises the following steps: 1) dispersing low-cost industrial grade pseudo-boehmite to form slurry, then adding aqueous solutions of acid and additives, and stirring uniformly; 2) performing heat treatment on the slurry at 180-240 DEG C for 24-72 hours to obtain gel; 3) drying the gel, and grinding and screening the gel to form semi-finished products with different particle sizes; and 4) slowly heating the semi-finished products to 1,500-1,600 DEG C in a vacuum state, and keeping a target temperature for 2-4 hours to obtain the alpha-Al2O3 ceramic particles containing the lamellar microcrystals. The alpha-Al2O3 ceramic particles containing the lamellar microcrystals are good in toughness and good in primary crystal morphology controllability, and have excellent grinding performance; and the hardness value of the ceramic particles is greater than 20GPa and the ball-milling toughness of the ceramic particles is greater than 76%.

Description

technical field [0001] The present invention relates to a kind of α-A1 containing flaky microcrystals 2 o 3 The ceramic particle and its preparation method and application belong to the field of inorganic non-metallic materials. Background technique [0002] Alumina ceramics are based on α-A1 2 o 3 The ceramic material of the main crystal phase has the advantages of high mechanical strength, high hardness, high melting point, high resistivity, good insulation, small thermal expansion coefficient, good wear resistance, and good corrosion resistance. It is widely used in machinery, electronics, and electric power. , chemical industry, medicine, construction and other high-tech fields (see: New Material Industry 2006,12,17), but alumina ceramics have a weakness, that is, low fracture toughness. The grains and grain boundaries of alumina microcrystalline ceramics are on the order of nanometers, and the number of grain boundaries is large. Therefore, alumina microcrystalline ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/626
CPCC04B35/10C04B35/62605C04B2235/3206C04B2235/3222C04B2235/3224C04B2235/3227C04B2235/3262C04B2235/3272C04B2235/3275
Inventor 张立焦秀玲陈代荣张建韩颖刘洋
Owner SHANDONG UNIV
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