Niobium-zirconium tungstate composite material and preparation method thereof

A composite material, zirconium tungstate technology, applied in the field of composite materials, can solve problems such as easy expansion and poor strength, achieve excellent performance, improve high temperature strength, and avoid separation

Inactive Publication Date: 2012-06-13
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing zirconium tungstate metal matrix composites are mainly used at room temperature, and are easy to expand and have poor strength in high temperature environments, so they cannot be used normally in high temperature environments.

Method used

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  • Niobium-zirconium tungstate composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The niobium-zirconium tungstate composite material of this embodiment is made of the following raw materials in mass percentage: 60% of zirconium tungstate, 5% of chromium, and 35% of niobium; the mass purity of the zirconium tungstate is not less than 97%, and the The mass purity is not less than 99%; the zirconium tungstate is zirconium tungstate powder with a particle size not greater than 5 μm, the chromium is chromium powder with a particle size not greater than 6 μm, and the niobium is niobium powder with a particle size not greater than 3 μm.

[0022] The preparation method of the composite material of the present embodiment comprises the following steps:

[0023] Step 1. Weigh the raw materials according to the mass percentage, then place the weighed raw materials in a planetary ball mill, use absolute ethanol as a dispersant, and ball mill and mix under the conditions that the rotating speed of the ball mill is 400rpm and the ball-to-material ratio is 5:1. 20h,...

Embodiment 2

[0028] This embodiment is the same as Embodiment 1, except that the niobium-zirconium tungstate composite material is made of the following raw materials in mass percentage: 35% zirconium tungstate, 10% chromium, and 55% niobium.

[0029] The performance testing results of the niobium-zirconium tungstate composite material prepared in this example are shown in Table 1.

Embodiment 3

[0031] This embodiment is the same as Embodiment 1, except that the niobium-zirconium tungstate composite material is made of the following raw materials in mass percentage: 75% zirconium tungstate, 1% chromium, and 24% niobium.

[0032] The performance testing results of the niobium-zirconium tungstate composite material prepared in this example are shown in Table 1.

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Abstract

The invention discloses a niobium-zirconium tungstate composite material which is prepared from the following raw materials in percentage by mass: 35-75% of zirconium tungstate, 1-10% of chromium and 20-60% of niobium. The mass purity of the zirconium tungstate is not less than 97%, and the mass purity of the chromium is not less than 99%. The invention also discloses a preparation method of the composite material. The chromium powder is introduced into the niobium-zirconium tungstate composite material system to enhance the high-temperature strength of the material; mechanical alloying is utilized to lower the sintering temperature of the niobium-zirconium tungstate composite material, thereby avoiding separation of the ceramic phase and the base; and the tensile strength of the preparedniobium-zirconium tungstate composite material at room temperature is 220-350MPa, the tensile strength at 600 DEG C is 75-120MPa, the thermal expansion coefficient at 25-600 DEG C is 0.1-1.9*10<-6>K<-1>, and the elastic modulus is less than or equal to 100GPa.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a niobium-zirconium tungstate composite material and a preparation method thereof. Background technique [0002] The material "expands with heat and contracts with cold" due to the anharmonic vibration effect of the lattice thermal vibration. However, some materials are contrary to this. They shrink when heated and expand when cooled, that is, they have a "negative thermal expansion" (Negative Thermal Expansion, NTE for short) effect. We call such materials negative thermal expansion materials or thermally shrinkable materials. Zirconium tungstate exhibits negative thermal expansion behavior in the entire temperature range from 0.3K to 1050K. [0003] The technical importance of zirconium tungstate mainly reflects that the high negative expansion properties make it possible to control the expansion coefficient of high expansion materials without destroyin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/00C22C27/02C22C1/05
Inventor 喻吉良李中奎郑欣刘辉王晖王东辉张建军
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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