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Method for preparing massive compact high-pure single-phase Y2SiO5 ceramic block material at low temperature

A ceramic material and densification technology, which is applied in the field of low-temperature preparation of bulk dense and high-purity single-phase Y2SiO5 ceramic materials, achieves the effects of low sintering temperature, simple equipment and short holding time.

Inactive Publication Date: 2008-03-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And so far there is no Y 2 SiO 5 Related reports on bulk materials and their properties

Method used

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  • Method for preparing massive compact high-pure single-phase Y2SiO5 ceramic block material at low temperature
  • Method for preparing massive compact high-pure single-phase Y2SiO5 ceramic block material at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw material is SiO 2 , Y 2 o 3 Powder and additive LiYO 2 Powder, the powder particle size is 5μm. 6 g SiO 2 , 25 grams Y 2 o 3 Powder and additive LiYO 2 The powders were mixed in isopropanol with magnetic stirring for 5 hours, where the additive LiYO 2 The contents are respectively 0%, 1%, and 3% of the total mass. After mixing, the powder is dried and calcined in a high-temperature air electric furnace at 1450°C for 1.5 hours. Analysis of LiYO by X-ray Diffraction 2 Content vs. Y 2 SiO 5 Effect of ceramic synthesis reaction (Fig. 1), (a) in Fig. 1 represents LiYO 2 X-ray diffraction curve with zero content, (b) represents LiYO 2 X-ray diffraction curve with 1% content, (c) represents LiYO 2 X-ray diffraction curve with 3% content, (d) represents the simulation theory Y 2 SiO 5 The X-ray diffraction curve; it can be seen from the figure that with LiYO 2 The addition of SiO 2 / Y 2 o 3 The reaction speed between them is significantly increased. ...

Embodiment 2

[0026] The difference from Example 1 is:

[0027] The raw material is SiO 2 , Y 2 o 3 Powder and additive LiYO 2 Powder, the powder particle size is 2μm. 13 g SiO 2 , 50g Y 2 o 3 Powder and additive LiYO 2 The powders were mixed in isopropanol with magnetic stirring for 5 hours, where the additive LiYO 2 The content is 3 grams. After mixing, the powder is dried and calcined in a high-temperature air electric furnace at 1500°C for 1.5 hours to obtain pure Y 2 SiO 5 ceramic powder.

[0028] Will Y 2 SiO 5 The ceramic powder was milled by a planetary ball mill for 10 hours. Both the milling tank and the milling medium were made of agate. The milling speed was 350 rpm. The ball milling medium was separated from the powder and dried to obtain an ultrafine powder with a particle size of 0.03-2 microns.

[0029] Then the dry powder is cold isostatically pressed to obtain a green body, the molding pressure is 280 MPa, and the green body with an initial relative density o...

Embodiment 3

[0033] The difference from Example 1 is:

[0034] The raw material is SiO 2 , Y 2 o 3 Powder and additive LiYO 2 Powder, the powder particle size is 10μm. 8 g SiO 2 , 30 g Y 2 o 3 Powder and additive LiYO 2 The powder was mixed in isopropanol with magnetic stirring for 8 hours, in which the additive LiYO 2 The content is 1.5 grams. After mixing, the powder is dried and calcined in a high-temperature air electric furnace at 1400°C for 4 hours to obtain pure Y 2 SiO 5 ceramic powder.

[0035] The calcined powder is milled by a planetary ball mill for 20 hours. Both the milling tank and the milling medium are made of agate. The milling speed is 250 rpm. The milling medium is separated from the powder and dried to obtain an ultrafine powder with a particle size of 0.03-2 microns. .

[0036] Then the dry powder is cold isostatically pressed to obtain a green body, and the cold isostatic pressing pressure is 200 MPa to obtain a green body with an initial relative densit...

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Abstract

The invention relates to a manufacturing technology of novel highly pure Y2SiO5 ceramic material, in particular to a manufacturing method for a highly pure massive and compact single-phase Y2SiO5 ceramic material. A LiYO2 additive is added into the mixed raw materials of Y2O3 and SiO2 in a proportion of 0.2-10.0 percent that of total weight of Y2O3< / SUB, SIO2 and LiYO2. Following a homogenous mixing, the mixture then go through sintering treatment at a temperature between 1250 DEG C and 1600 DEG C for 1-5 hours to obtain highly pure single-phase Y2SiO5 powder. The powder is ground then to obtain ultrafine powder and the ultrafine powder is allowed to be fed into high-strength steel moulds for single-phase cooling and isostatic cool pressing to obtain green compact with a relative density of 45-65 percent. Finally the green compact can be sintered in a high temperature combustion furnace or an oxygen furnace at a temperature between 1100 DEG C and 1600 DEG C for 0.5-2.5 hours to get finished product with a 85-100 percent density that of a theoretical density. The invention allows manufacturing highly pure massive and compact single-phase Y2SiO5 ceramic material under relatively low temperature conditions and the product can be used as a high temperature sintered material, an oxidation resistant protective coating etc,, which has a substantial market potential in aeronautic and astronautic fields.

Description

technical field [0001] The invention relates to bulk dense high-purity single-phase Y 2 SiO 5 A low-temperature preparation technology for ceramic materials, specifically a method by adding the additive LiYO 2 Methods for lowering synthesis temperature, improving product purity, stabilizing high-temperature phases, and promoting sintering. Background technique [0002] Y 2 SiO 5 It is a new type of refractory ceramic material with a melting point of 1950°C, so it can be used as a new type of high-temperature structural material, and because of its high Young's modulus, suitable thermal expansion coefficient and good corrosion resistance, Y 2 SiO 5 It can also be used as an excellent anti-oxidation protective coating, so it has broad application prospects in aviation and aerospace. However, Y 2 SiO 5 Ceramic on SiO 2 -Y 2 o 3 Its components cannot be solid-dissolved in the phase diagram, so a single-phase Y with strict stoichiometric ratio is obtained 2 SiO 5 is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/16C04B35/622
Inventor 周延春孙子其李美栓
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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