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Composite coating for high-temperature container for metal melting and method for making same

A high-temperature container and metal smelting technology, which is applied in the direction of metal material coating process, metal layered products, chemical instruments and methods, etc., can solve the problems of uneven thickness of silicon carbide layer and reduce the strength of the container, etc.

Inactive Publication Date: 2009-02-11
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for large-size graphite materials, due to the uneven temperature field of the high-temperature kiln, it is easy to make the thickness of the silicon carbide layer uneven. At the same time, the infiltration material diffuses deeply, resulting in a loose porous structure on the container wall, which reduces the strength of the container.

Method used

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  • Composite coating for high-temperature container for metal melting and method for making same
  • Composite coating for high-temperature container for metal melting and method for making same
  • Composite coating for high-temperature container for metal melting and method for making same

Examples

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Effect test

Embodiment 1

[0034] A single-layer 10μm-thick tungsten coating and a single-layer 0.25mm-thick yttrium oxide coating were prepared on the surface of a Φ300mm×Φ284mm×300mm graphite component with a wall thickness of 10mm. After 10 hours of use at 1400°C, the coating is intact, such as figure 1 shown. The spraying process parameters are shown in Table 1.

Embodiment 2

[0036] Prepare two layers of 10μm thick tungsten coating and a single layer of 0.25mm thick yttrium oxide coating on the surface of the stainless steel substrate, and use 20MW / m 2 After 400-600 times of irradiation, the coating is intact without cracking or peeling off. The spraying process parameters are shown in Table 2.

Embodiment 3

[0038] A single layer of 10 μm thick tungsten coating, a single layer of 10 μm thick molybdenum coating and two layers of 0.15 mm calcium zirconate coating were prepared on the surface of the stainless steel substrate, and no cracking and peeling occurred. The spraying process parameters are shown in Table 2.

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Abstract

The invention relates to a composite coating use for a smelting metal high-temperature vessel and a preparation method thereof, belonging to the technical field of smelting and preparing noble metal or rare metal. The method comprises the following steps: the surface of the smelting metal high-temperature vessel is provided with one or more metal tungsten, metal molybdenum, metal tantalum or metal niobium transition layers; the transition layer is provided with one or more yttrium oxide, calcium zirconate or magnesium zirconate coatings; or more than three layers of ladder coatings consisting of the metal tungsten, the metal molybdenum, the metal tantalum or the metal niobium and a ceramic surface material are formed on the surface of the smelting metal high-temperature vessel, with the compositions from more to less or from less to more. The composite coating solves the problem that smelting metal at high temperature reacts with the high-temperature vessel, and can be applied to the field of high-temperature smelting.

Description

technical field [0001] The invention relates to a composite coating for high-temperature containers for smelting metals and a preparation method thereof, and belongs to the technical field of smelting and preparation of precious metals or rare metals. Background technique [0002] Due to the high melting point and active chemical properties of high-quality metals and their alloys, they can almost react with materials such as corundum and quartz during smelting. Thermodynamic calculations show that calcium oxide, beryllium oxide, and the above metals have good chemical stability at high temperatures. Therefore, attempts have been made to melt titanium and its alloys with containers made of calcium oxide and other materials. However, since the calcium oxide container is difficult to sinter and form, it is easy to hydrolyze in humid air, and the oxygen content in the smelted metal is likely to increase during the smelting process, which affects the properties of the alloy. In ...

Claims

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Application Information

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IPC IPC(8): F27B14/08F27D1/10B32B33/00B32B15/04B32B9/00C23C4/06C23C4/10C23C4/02C23C4/08C23C4/11C23C4/134
Inventor 陶顺衍周霞明赵华玉丁传贤
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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