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Yttrium oxide coating material for sintering titanium alloy MIM product, and application of yttrium oxide coating material in corundum-mullite burning plate

A technology of yttrium oxide and titanium alloy, which is applied in the field of titanium alloy processing and production, can solve the problems of high price, poor thermal shock resistance, and large expansion coefficient, and achieve the effects of low production cost, good thermal shock resistance, and small expansion coefficient

Inactive Publication Date: 2021-03-02
湖南仁海科技材料发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using pure yttrium oxide to make setter plates is not only expensive, but also has a large expansion coefficient and poor thermal shock resistance.

Method used

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  • Yttrium oxide coating material for sintering titanium alloy MIM product, and application of yttrium oxide coating material in corundum-mullite burning plate
  • Yttrium oxide coating material for sintering titanium alloy MIM product, and application of yttrium oxide coating material in corundum-mullite burning plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Coating preparation: Weigh 50% of 180 mesh fused yttrium oxide, 40% of 320 mesh fused yttrium oxide, 10% of yttrium oxide micropowder with D90≤10um, add film forming agent PVA30%, yttrium oxide sol 2%, disperse Agent ammonium polyacrylate 0.2%, pour into high-speed mixer and fully mix and defoam to obtain yttrium oxide coating;

[0017] (2) Paint coating: use a spray gun to evenly coat the adjusted yttrium oxide paint on the surface of the corundum-mullite setter plate to obtain a wet billet;

[0018] (3) Drying and sintering: After the wet billet is naturally dried for 6 hours, it is transferred to an oven to dry at 120°C for 6 hours to fully volatilize the water, and then it is kept in an electric furnace at 1500°C for 6 hours, and after natural cooling, the yttrium oxide coated corundum is obtained- Mullite bearing board.

Embodiment 2

[0020] (1) Coating preparation: Weigh 45% of 180 mesh fused yttrium oxide, 35% of 320 mesh fused yttrium oxide, 20% of yttrium oxide micropowder with D90≤10um, add film forming agent PVA30%, yttrium oxide sol 2%, disperse Agent ammonium polyacrylate 0.2%, pour into high-speed mixer and fully mix and defoam to obtain yttrium oxide coating;

[0021] (2) Paint coating: use a spray gun to evenly coat the adjusted yttrium oxide paint on the surface of the corundum-mullite setter plate to obtain a wet billet;

[0022] (3) Drying and sintering: After the wet billet is naturally dried for 10 hours, it is transferred to an oven for 8 hours at 120°C to dry the water fully, and then it is kept in an electric furnace at 1600°C for 5 hours, and after natural cooling, the yttrium oxide coated corundum is obtained- Mullite bearing board.

Embodiment 3

[0024] (1) Coating preparation: Weigh 65% of 180 mesh fused yttrium oxide, 20% of 320 mesh fused yttrium oxide, 15% of yttrium oxide micropowder with D90≤10um, add 40% of methyl cellulose, 5% of yttrium oxide sol, Dispersant polyammonium methacrylate 0.8%, pour into high-speed mixer and fully mix and defoam to obtain yttrium oxide coating;

[0025] (2) Paint coating: use a spray gun to evenly coat the adjusted yttrium oxide paint on the surface of the corundum-mullite setter plate to obtain a wet billet;

[0026] (3) Drying and sintering: After the wet billet is naturally dried for 6 hours, it is transferred to an oven for 120°C to dry for 12 hours, so that the water is fully volatilized, and then it is kept in an electric furnace at 1650°C for 3 hours, and after natural cooling, the yttrium oxide coated corundum is obtained- Mullite bearing board.

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Abstract

The invention discloses a yttrium oxide coating material for sintering a titanium alloy MIM product. The yttrium oxide coating material is prepared by fully and uniformly mixing and defoaming electricsmelting yttrium oxide powder, a film-forming agent, yttrium oxide sol and a dispersing agent, wherein the electric smelting yttrium oxide powder comprises the following components in percentage by weight: 40-65% of electric smelting yttrium oxide with a particle size of less than or equal to 180 meshes, 20-40% of electric smelting yttrium oxide with a particle size of less than or equal to 320 meshes and 10-20% of yttrium oxide micropowder with D90 of less than or equal to 10 [mu]m. The invention further provides application of the yttrium oxide coating material in a corundum-mullite burningplate, wherein the surface of a corundum-mullite burning plate is evenly coated with the prepared yttrium oxide coating material through a spray gun, the coated corundum-mullite burning plate is transferred into a drying oven and dries at 120 DEG C for 6-12 hours after natural drying, the temperature is kept in an electric furnace at 1500-1650 DEG C for 3-6 hours, and natural cooling is performedto obtain the yttrium oxide coating corundum-mullite burning plate. The yttrium oxide coating corundum-mullite burning plate is low in production cost, small in expansion coefficient and good in thermal shock resistance, and meets the requirements of an MIM sintering process needing rapid cooling.

Description

technical field [0001] The invention relates to the field of titanium alloy processing and production, in particular to an yttrium oxide coating for sintering titanium alloy MIM products and its application on a corundum-mullite setter. Background technique [0002] The specific gravity of titanium and titanium alloys is almost half of that of iron metal. They have low density, high strength and satisfactory biocompatibility, and are widely used in aviation, aerospace, chemical industry, biomedicine and other fields. Metal powder injection molding (MIM) is a net shape process formed by combining powder metallurgy technology with plastic injection molding technology. It has the advantages of high raw material utilization, flexible component adjustment, net shape or near-net shape, etc. It produces high-dimensional and high-precision parts with a size of less than 100mm, so it is an ideal preparation and processing technology for titanium and titanium alloys. Sintering is a v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/505C04B35/622C04B41/87B22F3/22B22F3/10
CPCC04B35/505C04B35/62222C04B41/87C04B41/5045C04B41/009B22F3/225B22F3/10B22F2003/1042C04B2235/656C04B2235/6567C04B2235/5436C04B41/4539C04B41/4543C04B41/0072C04B35/10C04B35/185
Inventor 潘建华潘建中
Owner 湖南仁海科技材料发展有限公司