Pseudo-sapphire ceramics and its synthesis method

A sapphire and ceramic technology, which is applied in the field of pseudo-sapphire ceramics and its synthesis, can solve the problems of reducing the mechanical properties of ceramics, cracking of ceramic green bodies, difficulties, etc., and achieve excellent ceramic performance, large sintering temperature range, and the effect of not being easy to crack

Active Publication Date: 2020-12-29
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to sinter and combine pseudo-sapphire ceramics with raw materials such as quartz, alumina, and magnesia. The main performance is that the chemical composition range that can form pseudo-sapphire crystals is very narrow; Cordierite and other intermediate phases and residual quartz phases, residual quartz is likely to cause cracking of the ceramic body
Even after sintering at 1450°C for 6 hours, the maximum content of the pseudo-sapphire phase can only reach 70%; in addition, it is difficult to sinter and densify the ceramic green body, and the density of the synthesized pseudo-sapphire ceramics is low, and the density can only reach 2.0-2.3g / cm 3 , significantly reduce the mechanical properties of ceramics, the bending strength is less than 50MPa, the Vickers hardness is not more than 450HV, and the flatness and smoothness of the ceramic surface are also poor, which seriously affects the scope of use of ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Pseudo-sapphire quality ceramics, its raw materials include the following components by mass percentage: drift sand 35%, aluminum oxide 25%, magnesium oxide 39%, kaolin 1%, the sum of the mass percentages of the above components is 100% . The mass percentage of quartz in the aeolian sand is 81%. After weighing the raw materials according to the above mass ratio, they were mixed and ball-milled for 5 hours, then granulated and molded under a pressure of 90 MPa to obtain a green body; after the green body was sintered at 1450°C for 6 hours, the temperature was lowered to 1100°C and kept for 3 hours, and then The furnace is cooled to room temperature to obtain pseudo-sapphire ceramics with a content of 82% of the pseudo-sapphire phase and a density of 3.06g / cm 3 , the bending strength is 93MPa, and the Vickers hardness is 665HV.

Embodiment 2

[0023] Embodiment 2: Pseudo-sapphire quality ceramics, its raw material includes the following components by mass percentage: drift sand 37%, aluminum oxide 22%, magnesium oxide 38%, kaolin 3%, the sum of the mass percentages of the above components is 100% . The mass percentage composition of quartz in the wind-blown sand is 84% ​​(titanium dioxide accounts for the percentage content of above-mentioned raw material mass summation and is 1%, and the percentage content of lanthanum oxide accounting for above-mentioned raw material mass summation is 6%. Take raw material and After sintering aids, mix and ball mill for 4 hours, then granulate and shape the green body under a pressure of 80MPa; after sintering the green body at 1300°C for 3 hours, cool down to 1000°C and keep it warm for 2 hours, then cool to room temperature with the furnace, Obtain false sapphire ceramics, the content of false sapphire phase is 86%, and the density is 3.12g / cm 3 , the bending strength is 98MPa,...

Embodiment 3

[0024] Embodiment 3: Pseudo-sapphire quality ceramics, its raw material comprises the following components by mass percentage: drift sand 35%, aluminum oxide 26%, magnesium oxide 35%, kaolin 4%, the sum of the mass percentage of above each component is 100% . The mass percentage of quartz in the aeolian sand is 85%. The percentage content of titanium dioxide accounting for the total mass of the above raw materials is 4%, and the percentage content of cerium oxide accounting for the total mass of the above raw materials is 2%. Weigh the raw materials and sintering aids according to the above mass ratio, mix and ball mill for 3 hours, then granulate and shape the green body under a pressure of 70MPa; after sintering the green body at 1350°C for 4 hours, cool it down to 1050°C and keep it warm for 2 hours Hours, cooled to room temperature with the furnace, obtained pseudo-sapphire ceramics, the content of pseudo-sapphire phase was 92%, and the density was 3.28g / cm 3 , the bendi...

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Abstract

The invention discloses false-sapphire ceramic and a synthetic method thereof. The false-sapphire ceramic is prepared from the following raw mtaterial components in percent by mass: 35-40% of aeoliansand, 22-26% of aluminium oxide and 35-40% of magnesium oxide, and the sum of the mass percents of all the components is 100%. The synthetic method of the false-sapphire ceramic comprises the following steps: after weighing raw materials and a sintering additive according to a mass ratio, mixing, ball-milling, granulating, sintering, insulating, and cooling to room temperature with a furnace. thusobtaining the false-sapphire ceramic. The false-sapphire ceramic sintered and synthesized by adopting the raw materials and the synthetic method has the advantages that the sintering temperature is reduced, a sintered green body is not easily cracked, and the false-sapphire phase content is greatly increased. In addition, the synthesized false-sapphire ceramic is high in density and has excellent ceramic use property.

Description

Technical field: [0001] The invention relates to a ceramic and a synthesis method thereof, in particular to a pseudo-sapphire ceramic and a synthesis method thereof. Background technique: [0002] False sapphire (4MgO·5Al 2 o 3 2SiO2 2 ) in MgO-Al 2 o 3 -SiO 2 In the ternary system, it is a stable phase with high chemical stability, hardness and moderate thermal expansion performance. It can be used for sealing metal and ceramics and manufacturing protective materials and decorative materials. However, it is very difficult to sinter and combine pseudo-sapphire ceramics with raw materials such as quartz, alumina, and magnesia. The main performance is that the chemical composition range that can form pseudo-sapphire crystals is very narrow; Intermediate phases such as cordierite and residual quartz phases, and residual quartz are likely to cause cracks in the ceramic body. Even after sintering at 1450°C for 6 hours, the maximum content of the pseudo-sapphire phase can o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/195C04B35/64
CPCC04B35/195C04B35/64C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3232C04B2235/349C04B2235/77C04B2235/96
Inventor 史志铭王文彬曹振王志旭王晓光范文
Owner INNER MONGOLIA UNIV OF TECH
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