Method for preparing near-zero thermal expansion ZrO2/ZrW2O8 composite material

A composite material, near-zero expansion technology, applied in the direction of 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 Effects of performance improvement and production cost reduction

Active Publication Date: 2017-04-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for easier operation and reduced impact on outside variables such as pressure or heat conditions. It also reduces the size (volume) of samples that have been prepared while maintaining their properties even after decompositing them into zirconium oxide powder. By reducing the volume needed, this method saves time, lowers costs, improves efficiency, quality control, etc., making it possible to produce more precise materials than previously available.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to prevent cracks from happening due to changes made over time in certain types of metal oxide/zincoxy compound structures called zircalum welders. These new methods have been developed specifically aimed towards reducing these effects while maintaining good quality.

Method used

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  • Method for preparing near-zero thermal expansion ZrO2/ZrW2O8 composite material
  • Method for preparing near-zero thermal expansion ZrO2/ZrW2O8 composite material
  • Method for preparing near-zero thermal expansion ZrO2/ZrW2O8 composite material

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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 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 (unit...

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 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 Φ8×20...

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: Add 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, spray and add 0.3g of water to humidify the powder after crushing in a mortar, then sieve (60 mesh standard sieve) three times, and package and stale for 2 days;

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

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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

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Claims

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Application Information

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Owner HARBIN INST OF TECH
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