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Method for preparing near-zero expansion zro2/zrw2o8 composite material

A composite material, near-zero expansion technology, used in manufacturing tools, auxiliary molding equipment, ceramic molding machines, etc., can solve the problems of uneven product performance, long composite material cycle, low efficiency, etc., to shorten the preparation cycle, sample The effect of improving performance and reducing production costs

Active Publication Date: 2019-04-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves existing method and prepares nearly zero expansion ZrO 2 / ZrW 2 o 8 Composites have long cycle times and low efficiency, ZrW 2 o 8 It is easy to decompose during the preparation process and the product performance is not uniform, and it provides a method for preparing near-zero expansion ZrO 2 / ZrW 2 o 8 composite method, the present method is capable of suppressing ZrW 2 o 8 Phase change decomposition, rapid preparation of uniform and excellent near-zero expansion ZrO 2 / ZrW 2 o 8 composite material

Method used

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  • Method for preparing near-zero expansion zro2/zrw2o8 composite material
  • Method for preparing near-zero expansion zro2/zrw2o8 composite material
  • Method for preparing near-zero expansion zro2/zrw2o8 composite material

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Experimental program
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Effect test

Embodiment 1

[0040] A preparation of near-zero expansion ZrO 2 / ZrW 2 o 8 The composite material method is carried out in the following steps:

[0041] 1. Ingredients: weigh nano-ZrO respectively 2 Powder 9g, high purity ZrW 2 o 8 Powder 6g, mixed together;

[0042] 2. Wet ball milling: Add the mixed powder in step 1 together with 60g of zirconia grinding media and 10.5g of distilled water into the ball mill tank, and use a fast ball mill to mill for 50 minutes until the average particle size of the mixed powder slurry is D 50 ≤0.9μm, then add 1.2g of polyvinyl alcohol binder with a concentration of 5%, and take out the slurry after ball milling for 5 minutes;

[0043] 3. Manual granulation: sieve and dry the slurry taken out in step 2, crush it in a mortar, spray and add 0.3g of water to humidify the powder, then pass it through a 60-mesh standard sieve three times, and package and stale for 2 days;

[0044] 4. Dry pressing molding: put the sample obtained in step 3 into a Φ8×20 (u...

Embodiment 2

[0051] A preparation of near-zero expansion ZrO 2 / ZrW 2 o 8 The composite material method is carried out in the following steps:

[0052] 1. Ingredients: weigh nano-ZrO respectively 2 Powder 8.48g, high purity ZrW 2 o 8 Powder 6.52g, mixed together;

[0053] 2. Wet ball milling: Add the mixed powder in step 1 together with 60g of zirconia grinding media and 10.5g of distilled water into the ball mill tank, and use a fast ball mill to mill for 50 minutes until the average particle size of the mixed powder slurry is D 50 ≤0.9μm, then add 1.2g of polyvinyl alcohol binder with a concentration of 5%, and take out the slurry after ball milling for 5 minutes;

[0054] 3. Manual granulation: sieve and dry the slurry taken out in step 2, crush it in a mortar, spray and add 0.3g of water to humidify the powder, then pass it through a 60-mesh standard sieve three times, and package and stale for 2 days;

[0055] 4. Dry pressing molding: put the sample obtained in step 3 into a Φ8...

Embodiment 3

[0062] A preparation of near-zero expansion ZrO 2 / ZrW 2 o 8 The composite material method is carried out in the following steps:

[0063] 1. Ingredients: weigh nano-ZrO respectively 2 Powder 7.23g, high purity WO 3 Powder 7.77g, mixed together;

[0064] 2. Wet ball milling: put the mixed powder in step 1 together with 60g of zirconia grinding media and 11g of distilled water into the ball mill tank, and use a fast ball mill to mill for 50 minutes until the average particle size of the mixed powder slurry is D 50 ≤0.9μm, then add 1.2g of polyvinyl alcohol binder with a concentration of 5%, and take out the slurry after ball milling for 5 minutes;

[0065] 3. Manual granulation: sieve and dry the slurry taken out in step 2, grind it in a mortar, spray and add 0.3g of water to humidify the powder, then sieve (60-mesh standard sieve) three times, package and stale for 2 days;

[0066] 4. Dry pressing molding: put the sample obtained in step 3 into a Φ8×20 mold, pressurize a...

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Abstract

A method for preparing a near-zero thermal expansion ZrO2 / ZrW2O8 composite material comprises the following steps: 1, mixing zirconia powder and zirconium tungstate powder or zirconia powder and tungsten oxide powder; 2, adding the mixed powder and a grinding medium and a grinding solvent into a ball-milling tank, grinding until average particle size D50 of the mixed slurry is less than or equal to 0.9 microns, adding a polyvinyl alcohol adhesive and ball-milling for 5 min, and uniformly mixing; 3, carrying out manual granulation on the mixed powder, and ageing; 4, dry-pressing; 5, carrying out isostatic compaction; 6, discharging rubber at low temperature; 7, putting a sample into an enclosed crucible and embedding with tungsten oxide powder; 8, sintering and quenching; and 9, drying the sample so as to obtain the near-zero thermal expansion ZrO2 / ZrW2O8 composite material. The method is simple to operate and is little influenced by external factors. Decomposition rate of ZrW2O8 is greatly reduced; density and mechanical properties of the sample are enhanced; preparation period of the sample is shortened; and energy consumption and cost are saved.

Description

technical field [0001] The invention relates to a method for preparing near-zero expansion ZrO 2 / ZrW 2 o 8 Composite method. Background technique [0002] Zirconium tungstate (ZrW 2 o 8 ) is an isotropic negative expansion material, which can be combined with a structural ceramic material to prepare a near-zero expansion composite material with excellent performance, which can effectively weaken or even offset the "thermal expansion and contraction" effect, and avoid the material being subjected to large temperature gradients. The cracking failure of the material is caused by the generation of thermal stress inside the material during the change. [0003] At present, the preparation process of near-zero expansion composite materials containing zirconium tungstate is based on ZrO 2 / ZrW 2 o 8 Ceramic matrix composite materials are mainly powder metallurgy process method, which is characterized by simple principle and easy operation, but it has long preparation cycle,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/495C04B35/626C04B35/634C04B35/638B28B3/00B28B11/24B28B17/02
CPCB28B3/003B28B11/243B28B17/026C04B35/48C04B35/495C04B35/62605C04B35/63416C04B35/638C04B2235/6022C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/661C04B2235/77C04B2235/94C04B2235/95C04B2235/9607
Inventor 杨程孟松鹤李金平杜善义金华易法军
Owner HARBIN INST OF TECH