CN112430092A - Yttria coating for sintering titanium alloy MIM (metal-insulator-metal) product and application of yttria coating to corundum-mullite setter plate - Google Patents
Yttria coating for sintering titanium alloy MIM (metal-insulator-metal) product and application of yttria coating to corundum-mullite setter plate Download PDFInfo
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Abstract
The invention discloses an yttrium oxide coating for sintering a titanium alloy MIM product, which is prepared by fully mixing and defoaming electric melting yttrium oxide powder, a film-forming agent, yttrium oxide sol and a dispersing agent, wherein the electric melting yttrium oxide powder comprises the following components in percentage by weight: 40-65% of fused yttrium oxide with the granularity of less than or equal to 180 meshes, 20-40% of fused yttrium oxide with the granularity of less than or equal to 320 meshes and 10-20% of yttrium oxide micropowder with the granularity of less than or equal to 10 microns of D90. The invention also provides the application of the yttrium oxide coating on the corundum-mullite setter plate, and the adjusted yttrium oxide coating is uniformly coated on the surface of the corundum-mullite setter plate by a spray gun; and after natural drying, transferring the mixture into an oven for drying for 6-12 h at the temperature of 120 ℃, then preserving the heat for 3-6 h in an electric furnace at the temperature of 1500-1650 ℃, and naturally cooling to obtain the yttria coating corundum-mullite setter plate. The yttria-coated corundum-mullite setter plate has the advantages of low production cost, small expansion coefficient and good thermal shock resistance, and meets the requirement of an MIM sintering process needing rapid cooling.
Description
Technical Field
The invention relates to the field of titanium alloy processing and production, in particular to an yttrium oxide coating for sintering a titanium alloy MIM product and application thereof to a corundum-mullite setter plate.
Background
The specific gravity of titanium and titanium alloy is almost half of that of iron metal, and the titanium and titanium alloy has low density, high strength and satisfactory biocompatibility and is widely applied to the fields of aviation, aerospace, chemical engineering, biomedicine and the like. Metal powder injection molding (MIM) is a net forming process formed by combining powder metallurgy technology with plastic injection molding technology, has the advantages of high raw material utilization rate, flexible component adjustment, net forming or near net forming and the like, and can prepare high-dimensional and high-precision parts with the size within 100mm, thereby being an ideal titanium and titanium alloy preparation and processing process. Sintering is a very important process in the MIM process and plays a decisive role in the organization, the densification performance and the uniformity of chemical properties of products. For stainless steel MIM parts, corundum-mullite and 99 alumina setter plates are often used in sintering. However, titanium and titanium alloy are high chemical activity metals, and have high oxygen affinity, so that the titanium and titanium alloy are easy to chemically react with the sintering bearing plate made of the existing material during high-temperature sintering to generate brittle compounds, thereby causing the mechanical property reduction of the titanium alloy metal part. The yttrium oxide crucible is successfully applied to the melting casting of titanium alloy, and proves that the yttrium oxide has better wetting resistance and erosion resistance to the titanium alloy. However, the pure yttrium oxide is used for manufacturing the setter plate, so that the price is high, the expansion coefficient of the product is large, and the thermal shock resistance is poor.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides the yttrium oxide coating for sintering the titanium alloy MIM product, and the yttrium oxide coating with prominent erosion resistance is coated on the surface of the corundum-mullite load bearing plate with excellent thermal shock resistance as a substrate and is used for producing the composite load bearing plate for sintering the titanium alloy MIM part.
The invention provides an yttrium oxide coating for sintering a titanium alloy MIM product, which is prepared by fully mixing and defoaming electric melting yttrium oxide powder, a film forming agent, yttrium oxide sol and a dispersing agent, wherein the mass ratio of the electric melting yttrium oxide powder, the film forming agent, the yttrium oxide sol and the dispersing agent is 1: 0.3-0.5: 0.02-0.05: 0.002-0.008, and the electric melting yttrium oxide powder comprises the following components in percentage by weight: 40-65% of 180-mesh-0 fused yttrium oxide, 20-40% of 320-mesh-0 fused yttrium oxide and 10-20% of yttrium oxide micropowder with the D90 being less than or equal to 10 um.
Further, the film forming agent is one of water-soluble resin, PVA and methyl cellulose.
Further, the dispersing agent is ammonium polyacrylate or ammonium polymethacrylate.
The invention also provides an application of the yttrium oxide coating on a corundum-mullite setter plate, which specifically comprises the following steps:
(1) preparing the coating: weighing 180-0 mesh electrofused yttrium oxide, 320-0 mesh electrofused yttrium oxide, yttrium oxide micropowder with D90 being less than or equal to 10um, a film-forming agent, yttrium oxide sol and a dispersing agent according to the parts by weight, and fully mixing and defoaming in a high-speed mixer to obtain yttrium oxide coating;
(2) coating with paint: uniformly coating the adjusted yttrium oxide coating on the surface of a corundum-mullite setter plate by using a spray gun to obtain a wet blank;
(3) drying and sintering: and naturally drying the wet blank for 6-12 hours, then transferring the wet blank into an oven for drying for 6-12 hours at the temperature of 120 ℃ to fully volatilize the water, then preserving the heat for 3-6 hours in an electric furnace at the temperature of 1500-1650 ℃, and naturally cooling to obtain the yttria coating corundum-mullite setter plate.
The invention provides an yttrium oxide coating for sintering a titanium alloy MIM product, wherein a corundum-mullite load bearing plate with excellent thermal shock resistance is used as a substrate, and the yttrium oxide coating is coated on the surface of the corundum-mullite load bearing plate to obtain a composite load bearing plate for sintering titanium alloy MIM parts.
Drawings
FIG. 1 is a photomicrograph of a yttria-coated corundum-mullite setter plate of the present invention.
FIG. 2 is a high magnification micrograph of an yttria-coated corundum-mullite setter plate of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
(1) Preparing the coating: weighing 50% of 180-mesh fused yttrium oxide, 40% of 320-mesh fused yttrium oxide, 10% of yttrium oxide micropowder with D90 being less than or equal to 10um, the added film-forming agent PVA30%, yttrium oxide sol 2% and dispersant ammonium polyacrylate 0.2%, pouring the mixture into a high-speed stirrer, and fully mixing and defoaming to obtain yttrium oxide coating;
(2) coating with paint: uniformly coating the adjusted yttrium oxide coating on the surface of a corundum-mullite setter plate by using a spray gun to obtain a wet blank;
(3) drying and sintering: and naturally drying the wet blank for 6 hours, then transferring the wet blank into an oven for drying for 6 hours at the temperature of 120 ℃ to fully volatilize the water, then preserving the heat for 6 hours in an electric furnace at the temperature of 1500 ℃, and naturally cooling to obtain the yttria coating corundum-mullite setter plate.
Example 2
(1) Preparing the coating: weighing 45% of 180-mesh fused yttrium oxide, 35% of 320-mesh fused yttrium oxide, 20% of yttrium oxide micropowder with D90 being less than or equal to 10um, the added film-forming agent PVA30%, yttrium oxide sol 2% and dispersant ammonium polyacrylate 0.2%, pouring the mixture into a high-speed stirrer, and fully mixing and defoaming to obtain yttrium oxide coating;
(2) coating with paint: uniformly coating the adjusted yttrium oxide coating on the surface of a corundum-mullite setter plate by using a spray gun to obtain a wet blank;
(3) drying and sintering: and naturally drying the wet blank for 10 hours, transferring the wet blank into an oven for drying for 8 hours at the temperature of 120 ℃ to fully volatilize water, then preserving the heat for 5 hours in an electric furnace at the temperature of 1600 ℃, and naturally cooling to obtain the yttria coating corundum-mullite setter plate.
Example 3
(1) Preparing the coating: weighing 65% of 180-mesh fused yttrium oxide, 20% of 320-mesh fused yttrium oxide, 15% of yttrium oxide micropowder with D90 being less than or equal to 10um, 40% of additional methyl cellulose, 5% of yttrium oxide sol and 0.8% of dispersant ammonium polymethacrylate, pouring the mixture into a high-speed stirrer, fully mixing and defoaming to obtain yttrium oxide coating;
(2) coating with paint: uniformly coating the adjusted yttrium oxide coating on the surface of a corundum-mullite setter plate by using a spray gun to obtain a wet blank;
(3) drying and sintering: and naturally drying the wet blank for 6 hours, then transferring the wet blank into an oven for drying for 12 hours at the temperature of 120 ℃ to fully volatilize the moisture, then preserving the heat for 3 hours in an electric furnace at the temperature of 1650 ℃, and naturally cooling to obtain the yttria coating corundum-mullite setter plate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. An yttrium oxide coating for sintering a titanium alloy MIM product is characterized in that: the composite material is prepared by fully mixing and defoaming electric melting yttrium oxide powder, a film forming agent, yttrium oxide sol and a dispersing agent, wherein the mass ratio of the electric melting yttrium oxide powder to the film forming agent to the yttrium oxide sol to the dispersing agent is 1 to (0.3-0.5) to (0.02-0.05) to (0.002-0.008), and the electric melting yttrium oxide powder comprises the following components in percentage by weight: 40-65% of fused yttrium oxide with the granularity of less than or equal to 180 meshes, 20-40% of fused yttrium oxide with the granularity of less than or equal to 320 meshes and 10-20% of yttrium oxide micropowder with the granularity of less than or equal to 10 microns of D90.
2. The yttria coating of claim 1, wherein: the film forming agent is one of water-soluble resin, PVA and methyl cellulose.
3. The yttria coating of claim 1, wherein: the dispersant is ammonium polyacrylate or ammonium polymethacrylate.
4. Use of a yttria coating of any one of claims 1 to 3 on a corundum-mullite setter plate.
5. The use of the yttria coating of claim 4 on a corundum-mullite setter plate, comprising the steps of:
(1) preparing the coating: weighing fused yttrium oxide with the granularity of less than or equal to 180 meshes, fused yttrium oxide with the granularity of less than or equal to 320 meshes, yttrium oxide micro powder with the granularity of less than or equal to D90 and the film-forming agent, yttrium oxide sol and dispersing agent according to the parts by weight, and fully mixing and defoaming in a high-speed mixer to obtain yttrium oxide coating;
(2) coating with paint: uniformly coating the adjusted yttrium oxide coating on the surface of a corundum-mullite setter plate by using a spray gun to obtain a wet blank;
(3) drying and sintering: and naturally drying the wet blank for 6-12 hours, then transferring the wet blank into an oven for drying for 6-12 hours at the temperature of 120 ℃ to fully volatilize the water, then preserving the heat for 3-6 hours in an electric furnace at the temperature of 1500-1650 ℃, and naturally cooling to obtain the yttria coating corundum-mullite setter plate.
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| CN202011494032.3A CN112430092A (en) | 2020-12-16 | 2020-12-16 | Yttria coating for sintering titanium alloy MIM (metal-insulator-metal) product and application of yttria coating to corundum-mullite setter plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113735626A (en) * | 2021-08-30 | 2021-12-03 | 昆山卡德姆新材料科技有限公司 | Ceramic burning bearing jig and manufacturing method thereof |
| CN116444272A (en) * | 2023-03-13 | 2023-07-18 | 成都先进金属材料产业技术研究院股份有限公司 | Preparation method of rotating disc, rotating disc and application of rotating disc |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113735626A (en) * | 2021-08-30 | 2021-12-03 | 昆山卡德姆新材料科技有限公司 | Ceramic burning bearing jig and manufacturing method thereof |
| CN116444272A (en) * | 2023-03-13 | 2023-07-18 | 成都先进金属材料产业技术研究院股份有限公司 | Preparation method of rotating disc, rotating disc and application of rotating disc |
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