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Method for preparing compact aluminum phosphate film at aluminum oxide ceramic surface

A technology of alumina ceramics and aluminum phosphate film, which is applied in the field of ceramic material preparation and can solve problems such as complex methods and unfavorable application promotion

Inactive Publication Date: 2018-08-03
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, some researchers (Wei Lianqi et al., Preparation and characterization of new nano-aluminum phosphate dense ceramic films, Rare Metal Materials and Engineering, August 2007 Supplement, pages 516-518) use the high sintering activity of nano-aluminum phosphate to prepare dense ceramic films. Aluminum phosphate film, but this method is more complicated, which is not conducive to the application and promotion in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Mix aluminum metaphosphate, aluminum phosphate, and alumina together in a molar ratio of 2:1:1, and then use dry pressing to shape the mixed powder. The pressure of dry pressing is 60Mpa; The green body and alumina ceramics are placed in a high-temperature furnace, and the formed green body is placed directly above the alumina ceramics, and the distance between the green body and the alumina ceramics is kept at 0.1 mm by a support; at 20 ℃ / min Raise the temperature to 900 ℃ at a high speed and keep it warm for 60 minutes, then cool down to room temperature with the furnace, and a dense glass film can be prepared on the surface of the alumina ceramic; Heating to 700 ℃ and holding it for 2 hours, and then cooling to room temperature with the furnace, can make a dense aluminum phosphate film on the surface of alumina ceramics. The film produced at this time had a thickness of about 20 micrometers. It was found by XRD diffraction analysis that the main crystal phase was al...

Embodiment 2

[0010] Mix aluminum metaphosphate, aluminum phosphate, and alumina together in a molar ratio of 2:1:1, and then use dry pressing to shape the mixed powder. The pressure of dry pressing is 60Mpa; The green body and alumina ceramics are placed in a high-temperature furnace, and the formed green body is placed directly above the alumina ceramics, and the distance between the green body and the alumina ceramics is kept at 0.1 mm by a support; at 20 ℃ / min Raise the temperature to 900 ℃ at a speed of 90 minutes and keep it warm for 90 minutes, then cool down to room temperature with the furnace, and a dense glass film can be prepared on the surface of the alumina ceramic; Heating to 700 ℃ and holding it for 2 hours, and then cooling to room temperature with the furnace, can make a dense aluminum phosphate film on the surface of alumina ceramics. The thickness of the film produced at this time was about 35 microns. It was found by XRD diffraction analysis that the main crystal phase...

Embodiment 3

[0012] Mix aluminum metaphosphate, aluminum phosphate, and alumina together in a molar ratio of 2:1:1, and then use dry pressing to shape the mixed powder. The pressure of dry pressing is 60Mpa; The green body and alumina ceramics are placed in a high-temperature furnace, and the formed green body is placed directly above the alumina ceramics, and the distance between the green body and the alumina ceramics is kept at 0.1 mm by a support; at 20 ℃ / min Raise the temperature to 900 ℃ at a high speed and keep it warm for 120 minutes, then cool down to room temperature with the furnace, and a dense glass film can be prepared on the surface of the alumina ceramic; Heating to 700 ℃ and holding it for 2 hours, and then cooling to room temperature with the furnace, can make a dense aluminum phosphate film on the surface of alumina ceramics. The thickness of the film produced at this time was about 50 micrometers. It was found by XRD diffraction analysis that the main crystal phase was...

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Abstract

The invention relates to a method for preparing a compact aluminum phosphate film at the aluminum oxide ceramic surface. The method is characterized by comprising the following steps that (1) aluminummetaphosphate, aluminum phosphate and aluminum oxide are proportionality mixed according to a mole ratio of 2:1:1; then, mixed powder is subjected to formation a dry pressing method; (2) a dry pressing formation blank and aluminum oxide ceramic are put into a high-temperature furnace; the formation blank is placed right above the aluminum oxide ceramic; (3) the temperature is raised to 900 DEG C;heat insulation is performed for 60 to 120 minutes; then, the blank is cooled to room temperature along with a furnace; a layer of compact glass thin film is prepared at the aluminum oxide ceramic surface; (4) the aluminum oxide ceramic attached with the glass thin film is heated to 700 DEG C; heat insulation is performed for 2h; then, the aluminum oxide ceramic is cooled to room temperature along with the furnace, i.e., the compact aluminum phosphate film is prepared at the aluminum oxide ceramic surface.

Description

technical field [0001] The invention provides a method for preparing a dense aluminum phosphate film on the surface of alumina ceramics, which belongs to the technical field of preparation of ceramic materials. Background technique [0002] Aluminum phosphate is used as a binder and a high-temperature-resistant ceramic material. It is easy to prepare and store, and has good room temperature and high-temperature performance. It is widely used as a friction-resistant material, a high-temperature resistant material, and an oxidation-resistant film material for certain materials. . Applying aluminum phosphate to the field of high-temperature ceramics can prepare dense films, and wrapping the ceramic films prepared on the surface of the substrate can significantly improve the friction and wear properties of the substrate and the oxidation resistance of some substrate materials (such as carbides, nitrides, etc.) . Alumina is a kind of high-temperature-resistant and wear-resistan...

Claims

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Application Information

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IPC IPC(8): C04B41/87
CPCC04B41/87C04B41/009C04B41/5048C04B41/4558C04B35/10
Inventor 白佳海高杰
Owner SHANDONG UNIV OF TECH
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