Method for adding ceramic sintering auxiliary

A technology of sintering aids and ceramics, applied in the field of ceramic materials, can solve problems such as sintering first, difficulty in achieving sintering aids, and agglomeration of aids, and achieve the effects of improving sintering aids, uniform and simultaneous sintering, and avoiding agglomeration

Active Publication Date: 2013-09-18
重庆兀盾纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the capillary force of this suspension or sol addition method, a small amount of ceramic sintering aids are easy to agglomerate themselves and fill in the voids of the main phase particles, which is prone to local sintering first, and it is difficult to achieve the sintering aid effect.

Method used

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  • Method for adding ceramic sintering auxiliary
  • Method for adding ceramic sintering auxiliary
  • Method for adding ceramic sintering auxiliary

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for adding a ceramic sintering aid in this embodiment, the steps are as follows:

[0030] (1) Take 3ml TiCl 4 Dissolve in 30ml ethanol to form TiCl 4 solution;

[0031] (2) Take 100g of alumina powder (W40, with an average particle size of 40μm) and the above TiCl 4 The solution was stirred and mixed, soaked for 15 minutes; then stirred in a fume hood while blowing with hot air until the ethanol was completely dried to obtain a mixed powder;

[0032] (3) Calcining the above mixed powder in a muffle furnace at a temperature of 800°C and keeping it warm for 2 hours to obtain nano-TiO 2 The coating wraps the powder, that is, the sintering aid is nano-TiO 2 The form of coating is wrapped on the surface of alumina powder particles.

[0033] In this embodiment, the nano-TiO wrapped on the surface of the alumina powder particles 2 , whose mass is 0.79% of the mass of alumina powder.

[0034] In this embodiment nano-TiO 2 Add 2% PVA to the coated powder, dry pr...

Embodiment 2

[0036] A method for adding a ceramic sintering aid in this embodiment, the steps are as follows:

[0037] (1) Take 4g ZrCl 4 Dissolve in 50ml ethanol to form ZrCl 4 solution;

[0038] (2) Take 100g of alumina powder (W40, with an average particle size of 40μm) and the above ZrCl 4 The solution was stirred and mixed, soaked for 30 minutes; then stirred in a fume hood while blowing with hot air until the ethanol was completely dried to obtain a mixed powder;

[0039] (3) Calcining the above mixed powder in a muffle furnace at a temperature of 600°C and keeping it warm for 2 hours to obtain nano-ZrO 2 The coating wraps the powder, that is, the sintering aid is nano-ZrO 2 The form of coating is wrapped on the surface of alumina powder particles.

[0040] In this example nano ZrO 2 Add 2% PVA to the coated powder, dry press at 6MPa, and calcinate at 1600°C for 2 hours to obtain porous alumina ceramics. The scanning electron microscope photos of its cross-section are as follows:...

Embodiment 3

[0042] The difference between a method for adding a ceramic sintering aid in this embodiment and the first embodiment is that:

[0043] Step (1) TiCl 4 The dosage is 5ml; the alumina powder in step (2) is ball-milled and mixed with 90g alumina powder (W40, average particle size 40μm) and 10g alumina powder (W1, average particle size 1μm); The time is 60 min; the calcination temperature in step (3) is 850°C.

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Abstract

The invention discloses a method for adding a ceramic sintering auxiliary. The ceramic sintering auxiliary is added in the form of forming a nano TiO2 or nano ZrO2 coating on the surface of a main phase powder; in such a way, even dispersion of a small quantity of sintering agent in the main phase powder is realized; the sintering assisting effect is effectively improved through addition of a small dosage of sintering auxiliary. The method is advantageous for sintering preparation of high-purity phase ceramics, and also effectively capable of solving the aggregation problem of the sintering auxiliary when the difference between the grain sizes of the main phase powder and the sintering auxiliary is overhigh, and avoiding local overburning; as a result, the sintering homogeneity of the main phase powder particles and the sintering assisting effect of the sintering auxiliary are effectively improved.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a method for adding ceramic sintering aids in the ceramic preparation process. Background technique [0002] Ceramic sintering aids are usually used in the sintering of high-melting point ceramics such as alumina, silicon nitride, aluminum nitride, etc. The purpose is to significantly reduce the sintering temperature of high-melting point ceramics by adding ceramic sintering aids, so as to achieve energy consumption and preparation costs. decrease. The mechanism of action of ceramic sintering aids usually includes the following three types: [0003] (1) The sintering aid itself can form a liquid phase at a lower temperature, and promote the material transfer rate of high melting point ceramics through the liquid phase, such as kaolin, B 2 o 3 , albite, potassium feldspar, etc. as sintering aids for the sintering of alumina ceramics. [0004] (2) The sintering aid fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628C04B35/63
Inventor 常启兵周健儿汪永清张小珍梁健胡学兵
Owner 重庆兀盾纳米科技有限公司
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