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Negative thermal-expansion coefficient adjustable laminated ceramic matrix composite and preparing method thereof

A technology of negative thermal expansion coefficient and composite materials, which is applied in the direction of ceramic layered products, chemical instruments and methods, layered products, etc., can solve problems such as difficult to obtain compensation effect, complicated sintering process, and difficult to control

Inactive Publication Date: 2006-01-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sintering of this material is difficult to be dense. Although Merkel et al. have described in detail the use of various sintering aids to increase the density in the patent specification, the sintering process is complicated and difficult to control. The negative expansion of the formed composite material is difficult to control and difficult to control. Get a reliable compensation effect

Method used

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  • Negative thermal-expansion coefficient adjustable laminated ceramic matrix composite and preparing method thereof
  • Negative thermal-expansion coefficient adjustable laminated ceramic matrix composite and preparing method thereof
  • Negative thermal-expansion coefficient adjustable laminated ceramic matrix composite and preparing method thereof

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Effect test

Embodiment l

[0025] wxya 2 o 8 -20Vol.% SiO 2 laminated composite ceramic substrate

[0026] Prepare single-phase zirconium tungstate according to the following process: commercially available ZrO(NO 3 ) 2 Configured as 1MZrO(NO 3 ) 2 solution, and configure 1M ammonia complex (NH 4 ) 6 h 2 W 12 o 40 etc. as precursors, these precursors are uniformly mixed according to the atomic ratio of the metals contained in Zr:W=1.0:2.0, heated in a water bath at 60-80°C with constant stirring, and titrated with 2M acetic acid solution into the mixed precursors until A uniform colloidal precipitate containing W and Zr was completely formed. The resulting colloidal precipitate was washed and dehydrated to form a wet gel. Keep warm at 1100-1150°C for 2-4 hours, then quickly quench to room temperature, mix the obtained product with absolute ethanol and ball mill for 4 hours, repeat the above-mentioned process of calcination and quenching to room temperature 1-2 times, the calcination temperat...

Embodiment 2

[0031] 0.4mol% Y 2 o 3 -ZrW 2 o 8 / SiO 2 laminated composite ceramic substrate

[0032] Preparation containing 0.4mol% Y 2 o 3 The process of the zirconium tungstate solid solution powder is as follows: with commercially available Y 2 o 3 Dissolved in nitric acid solution, configured as 0.1M Y(NO 3 ) 3 solution, commercially available ZrO(NO 3 ) 2 Configured as 1M ZrO(NO 3 ) 2 solution, and configure 1M ammonia complex (NH 4 ) 6 h 2 W 12 o 40 etc. as precursors, these precursors are uniformly mixed according to the atomic ratio of the metals contained in Y: Zr: W = 0.008: 0.992: 2.0, heated in a water bath at 60-80°C with constant stirring, and titrated with 2M Acetic acid solution until a homogeneous colloidal precipitate containing various metal atoms is completely formed

[0033] With the above preparation containing 0.4mol% Y 2 o 3 Zirconium tungstate solid solution powder and commercially available amorphous silica powder are used as raw materials. T...

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Abstract

The invention discloses a negative thermal-expansion coefficient adjustable laminated ceramic matrix composite and preparing method thereof consisting of, employing centrifugal casting and molding process, dispersing the negative expanding powder material whose component is cubic phase zirconium tungstate ZrW2O8 or doped and modified zirconium tungstate ZrW2O8 and near-zero expanding amorphous silicon oxide SiO2 powder into polyvinyl alcohol solution, so as to prepare zirconium tungstate powder slurry and silicon oxide powder slurry, employing a centrifugation deposition method to remove the water-based composition in the powder slurry, alternately depositing the zirconium tungstate powder and silicon oxide powder onto the filtration sheet, forming the blank of laminated composite material, finally proceeding high temperature sintering to obtain the compact laminated ceramic composite material.

Description

technical field [0001] The invention relates to a laminated ceramic matrix composite material with adjustable negative thermal expansion coefficient and a preparation method thereof. By adopting the method proposed by the invention, a series of ceramic matrix composite materials with adjustable negative thermal expansion coefficient can be obtained. The composite material can be used to manufacture substrates for thermal stability compensation packaging of optical fiber gratings, and belongs to the technical field of packaging materials for electronic or optoelectronic devices. Background technique [0002] Cubic phase zirconium tungstate ceramics, as a ceramic material with large isotropic negative expansion coefficient in a wide temperature range (0.3-1050K), has been extensively studied in recent years. Zirconium tungstate materials were first reported by J.Graham et al. in 1959 (J.Am.Ceram.Soc., 42, p570, 1959). In the 1960s, some documents also reported that zirconium t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/624B32B18/00
Inventor 孔向阳吴建生徐明钢
Owner SHANGHAI JIAO TONG UNIV
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