Method for preparing near-zero thermal expansion composite material

A composite material and near-zero expansion technology, which is applied in the field of methods and near-zero thermal expansion composite materials, and the preparation of near-zero thermal expansion composite materials, can solve the problems of high thermal expansion coefficient and strong thermal stress of composite materials, and achieve the effect of low thermal expansion coefficient

Inactive Publication Date: 2011-10-19
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, the published ZrW 2 o 8 Based thermally expandable composites with metal matrix - cubic ZrW 2 o 8 Composite materials, specific examples such as Cu-ZrW 2 o 8 , but due to Cu and ZrW 2 o 8 The expansion coefficient does not match, it is easy to generate strong thermal stress, which induces ZrW 2 o

Method used

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  • Method for preparing near-zero thermal expansion composite material
  • Method for preparing near-zero thermal expansion composite material
  • Method for preparing near-zero thermal expansion composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] In this embodiment, y=0 and x=0 in the general formula (I) are taken, that is, the general formula of the precursor is ZrW 2 o 7 (OH) 2 2H 2 O.

[0057] According to the ratio of stoichiometric ratio Zr:W=1:2, weigh 0.04mol5(NH 4 ) 2 O·12WO 3 ·5H 2 O and 0.02mol ZrOCl 2 ·8H 2 O, respectively dissolved in 40mL of distilled water, while stirring, the two solutions were dropped into 30mL of distilled water at the same time, resulting in a white precipitate. After the dropwise addition was completed, stirring was continued for 2 h to obtain a white slurry. While stirring, the white slurry was heated and evaporated to dryness to obtain a white solid.

[0058] After taking the white solid and grinding it, put it into figure 1 In the second container shown, add 10 mL of hydrochloric acid with a concentration of 6 mol / L into the first container as an acid gas source, place the second container in the first container above the liquid level, seal it, and place it togethe...

Embodiment 2

[0070] Raw material adopts 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O and ZrOCl 2 ·8H 2 O, mixed according to the stoichiometric ratio, and then prepared according to the method of Example 1 to obtain the zirconium tungstomolybdate precursor ZrWMoO 7 (OH) 2 (H 2 O) 2 . The concentration of W, Zr and Mo elements in the gas source solution after the reaction is detected by ICP method, and the calculation results show that the amounts of W, Zr and Mo elements lost in the gas source solution are all less than 0.02wt%.

[0071] Take PbO powder, B 2 o 3 Powder and SiO 2 After the powder and the precursor are mixed according to the ratio in Table 1, take 0.5g of the mixture and put it into a stainless steel mold for compression molding to obtain a molded body. The inner wall of the stainless steel mold is coated with a lubricant as a release agent in advance, and the molding pressure is 3.2 MPa.

[0072] The molded body was fired at 510°C for 8h in the...

Embodiment 3

[0078] The raw material is 0.01mol ZrOCl 2 ·8H 2 O, 0.01×1.8 / 12mol5(NH 4 ) 2 O·12WO 3 ·5H 2 O, 0.01×0.2mol NH 4 VO 3 After mixing, then prepare zirconium tungstate precursor ZrW according to the method for embodiment 1 1.8 V 0.2 o 6.9 (OH) 2 h 2 O, measure the XRD pattern such as image 3 shown. image 3 The results show that the diffraction index of the precursor body conforms to the I4 1 Diffraction conditions of the cd space group, the crystal and ZrMo 2 o 7 (OH) 2 (H 2 O) 2 (Clearfield, A.; Blessing, R.H., The preparation of a crystalline basic zirconium tungstate. J. Inorg. Nuc. Chem. 1974, 36(5), 1174-1176) is a heteroisomeric compound.

[0079] Take PbO powder, B 2 o 3 Powder and SiO 2 After mixing the powder and the precursor according to the ratio in Table 1, take 0.5 g of the mixture and put it into a stainless steel mold for compression molding to obtain a molded body. The inner wall of the stainless steel mold is coated with a lubricant as a re...

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Abstract

The invention provides a near-zero thermal expansion composite material and a preparation method thereof. The preparation method comprises the following steps of: (a), mixing flux powder and tungstate solid solution precursor powder to obtain a first mixture, wherein the tungstate solid solution precursor has a chemical formula shown as the general formula (I) as follows: Zr(W1-yMoy)2-xVxO8-x/2(OH)2(H2O)2(I), in the general formula (I), x is more than or equal to 0 and less than or equal to 0.4, and y is more than or equal to 0 and less than 1; and the flux comprises PbO, B2O3 and SiO2; (b), pressing and forming the first mixture to obtain a formed body; and (c), roasting the formed body to obtain the near-zero thermal expansion composite material. In the invention, the near-zero thermal expansion composite material is prepared by mixing and roasting the flux comprising PbO, B2O3 and SiO2 and the tungstate solid solution precursor. Experimental results show that the thermal expansion coefficient of the near-zero thermal expansion composite material prepared by the preparation method disclosed by the invention in a temperature range of minus 50 to plus 300 degrees centigrade is in a range of +/- 2*10<-6>K<-1>.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a method for preparing a near-zero thermal expansion composite material and the near-zero thermal expansion composite material. Background technique [0002] The near-zero thermal expansion composite material mentioned in this article refers to an extremely low thermal expansion material with a very low thermal expansion coefficient or a thermal expansion coefficient ≤±2×10 -6 K -1 Near-zero thermal expansion materials, near-zero thermal expansion composite materials have good thermal shock resistance, and have always been one of the hotspots in the field of materials science. Near-zero expansion composites have broad application prospects in many fields. For example, when a near-zero thermal expansion material is used as a coating on the surface of a high-precision optical mirror, the problem of optical performance degradation due to temperature changes can be prevented. As...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/63C04B35/622
Inventor 赵新华韩颖
Owner BEIJING NORMAL UNIVERSITY
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