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Methods for preparing compact silicon nitride ceramic material and compact special-shaped silicon nitride ceramic material by virtue of aqueous tape casting

A technology of water-based tape casting and silicon nitride ceramics, which is applied in the field of preparing silicon nitride ceramic materials, can solve the problems of low density of dense special-shaped silicon nitride ceramic materials, small size of sintered blocks, and low density. Superior processing performance, high strength and high density

Active Publication Date: 2014-07-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high cost, small volume of sintered block, difficulty in follow-up processing, low density, poor strength and low density and strength of preparing dense special-shaped silicon nitride ceramic materials in the existing method for preparing dense silicon nitride ceramic materials. poor problem, and provide a method for preparing dense silicon nitride ceramic materials and dense special-shaped silicon nitride ceramic materials by water-based tape casting

Method used

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  • Methods for preparing compact silicon nitride ceramic material and compact special-shaped silicon nitride ceramic material by virtue of aqueous tape casting
  • Methods for preparing compact silicon nitride ceramic material and compact special-shaped silicon nitride ceramic material by virtue of aqueous tape casting
  • Methods for preparing compact silicon nitride ceramic material and compact special-shaped silicon nitride ceramic material by virtue of aqueous tape casting

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specific Embodiment approach 1

[0052] Embodiment 1: This embodiment is a method for preparing dense silicon nitride ceramic materials by water-based tape casting, which is completed according to the following steps:

[0053] 1. Adding sintering aids: First, use absolute ethanol to mix silicon nitride powder and sintering aids powder, stir for 20h-24h at a stirring speed of 300r / min-350r / min, and then stir at a temperature of 50 Dry at ℃~80℃ for 10~12 hours, then mechanically pulverize and sieve to obtain silicon nitride / sintering aid powder;

[0054] The silicon nitride powder described in step 1 accounts for 90% to 95% of the total mass of the silicon nitride powder and the sintering aid powder;

[0055] The sintering aid powder described in step 1 accounts for 5% to 10% of the total mass of the silicon nitride powder and the sintering aid powder;

[0056] The volume ratio of the total mass of the silicon nitride powder and sintering aid powder described in step 1 to absolute ethanol is 1g:(10mL-15mL);

...

specific Embodiment approach 2

[0074] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass ratio of the polyvinyl alcohol solution described in step 2 to the silicon nitride / sintering aid powder is (0.06-0.08):1. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0075] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 3, the slurry is poured on the glass substrate for tape casting, and the speed of the scraper during the tape casting process is 15cm / min~20cm / min, drying the flow-cast slurry at room temperature for 16h-20h, peeling off the glass substrate to obtain a silicon nitride ceramic green tape with a thickness of 200μm-300μm. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides methods for preparing compact silicon nitride ceramic material and compact special-shaped silicon nitride ceramic material by virtue of aqueous tape casting, and relates to methods for preparing a silicon nitride ceramic material. The methods aim at solving the problems of high cost, small agglomerate volume, difficult subsequent processing, low compactness and poor strength of the existing method for preparing the silicon nitride ceramic material, and the problems of low compactness and poor strength of the preparation of a special-shaped silicon nitride ceramic material. The method for preparing the compact silicon nitride ceramic material comprises the following steps: 1, adding sintering acids; 2, preparing slurry; 3, preparing a silicon nitride ceramic raw tape; 4, preparing a tape-ranked silicon nitride substrate green body; and 5, sintering. The method for preparing the compact special-shaped silicon nitride ceramic material comprises the following steps: 1, adding sintering acids; 2, preparing slurry; 3, preparing a silicon nitride ceramic raw tape; 4, preparing a tape-ranked special-shaped silicon nitride substrate green body; and 5, sintering. The methods are capable of obtaining the compact silicon nitride ceramic material and the compact special-shaped silicon nitride ceramic material.

Description

technical field [0001] The invention relates to a method for preparing silicon nitride ceramic material. Background technique [0002] Silicon nitride materials have a series of excellent properties, such as: low density, high strength, good thermal shock resistance, wear resistance, fracture toughness, mechanical fatigue resistance, creep resistance and oxidation resistance. Si 3 N 4 Ceramics are widely used in various fields, among which Si 3 N 4 whisker reinforced Si 3 N 4 Ceramics can be used in ceramic knives, wire drawing dies, bearings, turbine rotors, heat-resistant vortex and many other aspects. In order to obtain highly densified silicon nitride ceramics with excellent performance, not only the composition of the material must be optimized, but also the raw silicon nitride powder that meets certain requirements must be used. [0003] Silicon nitride ceramic materials have a series of excellent mechanical properties and physical and chemical properties, so it...

Claims

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Application Information

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IPC IPC(8): C04B35/583C04B35/622
Inventor 叶枫刘仕超高晔张标刘强林少杰
Owner HARBIN INST OF TECH
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