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A method for preparing negative expansion material zirconium tungstate by solid phase reaction sintering method

A negative expansion material, solid-phase reaction technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of cumbersome, low efficiency, etc., and achieve the effect of simple principle, high yield, and improved yield

Active Publication Date: 2016-11-09
HARBIN INST OF TECH
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  • Summary
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Problems solved by technology

[0005] The present invention is to solve existing method and prepare ZrW 2 o 8 The problems of cumbersomeness and low efficiency provide a method for preparing negative expansion material zirconium tungstate by solid state reaction sintering method

Method used

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  • A method for preparing negative expansion material zirconium tungstate by solid phase reaction sintering method
  • A method for preparing negative expansion material zirconium tungstate by solid phase reaction sintering method
  • A method for preparing negative expansion material zirconium tungstate by solid phase reaction sintering method

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specific Embodiment approach 1

[0027] Specific implementation mode 1: The method for preparing the negative expansion material zirconium tungstate by the solid phase reaction sintering method of this implementation mode is carried out according to the following steps:

[0028] 1. Ingredients: Mix zirconia powder and tungsten oxide powder at a mass ratio of 1:3.5-4 to obtain a mixed material, and then mix the mixed material, zirconia balls and distilled water at a mass ratio of 1:2-5 : Add the ratio of 0.5 to 2 into the ball mill jar;

[0029] 2. Ball milling: place the ball milling tank in step 1 in a fast ball mill or a planetary ball mill, ball mill until the average particle size of the mixture is less than 1 μm, then add polyvinyl alcohol as a binder and ball mill for 5 minutes before taking out the slurry;

[0030] 3. Dry the slurry: pass the slurry obtained in step 2 through a 40-mesh standard sieve, then place it in a blast drying oven at 85-100°C for 14-16 hours, and then crush it with a mortar and ...

specific Embodiment approach 2

[0034] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, zirconia powder and tungsten oxide powder are mixed according to the mass ratio of 1:3.76. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0035] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in Step 1, the mixed material, zirconia balls and distilled water are added to the ball mill tank at a mass ratio of 1:3-4:1-1.5. Others are the same as in the first embodiment.

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Abstract

The invention provides a method for using a solid phase reaction sintering method to prepare a negative thermal expansion material of zirconium tungstate, and relates to a preparation method of the negative thermal expansion material of zirconium tungstate. The invention aims to solve the problem that an existing method for preparing ZrW2O8 is cumbersome and inefficient. The method comprises: 1. mixing zirconia powder and tungsten oxide powder to obtain a mixed material, and adding the mixed material, zirconia balls, and distilled water into a ball milling tank; 2. placing the ball milling tank in a ball mill, ball-milling until an average diameter of the mixed material is less than 1 [mu]m, adding olyvinyl alcohol as a binder, ball-milling for 5 minutes, and then taking out slurry; 3. sieving the slurry through a 40 mesh sieve, putting the material in a forced-draft oven to dry, crushing the material by using a mortar; and carrying out sieving to obtain powder; 4. adding distilled water to the powder to mix evenly, and packaging the mixture to decay; 5. molding; and 6. carrying out sintering to obtain the negative thermal expansion material of zirconium tungstate. The method provided by the invention is simple in principle, easy in operation, and not liable to be affected by an external factor. The method provided by the invention is used for preparation of the negative thermal expansion material of zirconium tungstate..

Description

technical field [0001] The invention relates to a preparation method of negative expansion material zirconium tungstate. Background technique [0002] Traditional structural materials generally produce thermal stress when the temperature changes due to their large thermal expansion coefficients, thereby weakening the strength of the structural material, and even causing the material to crack and fail in severe cases. Therefore, seeking a material with negative thermal expansion and combining it with traditional structural materials to prepare low-expansion materials or even zero-expansion materials has become a current research hotspot. Early known negative thermal expansion materials include quartz ceramics, cordierite, perovskite ferroelectric PbTiO 3 , semiconductor Si, Ga, etc., but the negative thermal expansion properties (NTE) of these materials are mostly limited in a narrow temperature range, the thermal expansion coefficient is too large and their anisotropy is no...

Claims

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Application Information

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IPC IPC(8): C01G41/00
Inventor 杨程孟松鹤李金平易法军解维华许承海金华
Owner HARBIN INST OF TECH
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