Yttrium oxide-tungsten continuous gradient material and preparation method thereof and application to high-temperature alloy smelting crucible manufacturing

Abstract

The invention relates to a yttrium oxide-tungsten continuous gradient material and a preparation method thereof and application to high-temperature alloy smelting crucible manufacturing. The gradient material comprises a tungsten layer with a thickness of 10, a yttrium oxide layer with a thickness of 11, and a transition layer with a thickness of 12 and with a tungsten-enriched surface and a yttrium oxide-enriched surface; 10 and 11 are independently not lower than 0; 12 is higher than 0; and the volume fraction of yttrium oxide in the transition layer from a position z of the tungsten-enriched surface is CY2O3=(z-10 / 1)p, and the volume fraction of tungsten is CW=1-CY2O3, wherein 1=10+12, p=0.1, z is not higher than 1 and not lower than 10. The method preferentially adopts a free precipitation mode to combine with a cold press molding and sintering process to form the transition layer. The invention further provides the application of the gradient material to manufacturing of high-temperature alloy smelting crucibles. The gradient material is excellent in thermal shock resistance and erosion resistance, and can be widely applied to the field of high-temperature alloy smelting. The method is simple in process, lower in energy consumption, environment-friendly and broad in industrial application prospect.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a yttrium oxide-tungsten continuous gradient material, a preparation method thereof, and an application in the manufacture of a high-temperature alloy melting crucible. [0002] technical background [0003] With the development of science, some metals and alloy materials with special properties are widely used in the automobile industry, aerospace, electrical and electronics, chemical industry, petroleum, national defense and military industry, etc. Including magnesium alloy, aluminum alloy, nickel alloy, copper alloy, uranium alloy, etc. For these alloy materials, high purity is required during use to ensure performance. Therefore, the smelting of alloys has important national value. Due to the advantages of high temperature resistance, good thermal shock resistance, easy processing and low price, graphite materials are widely used as crucible materials for melting superal...

AI Technical Summary

Problems solved by technology

However, this crucible is based on graphite and needs to be coated with a thin layer of SiC on the inner layer, so it cannot be used for melting metals or alloys sensitive to C.

In addition, the proportion of high-temperature stable oxide and refractory metal in the sub-three layers of the transition layer in the crucible is only a simple increase and decrease, and the optimal matching of the thermal stress of the target material is not achieved by optimizing the gradient distribution function of the target material. Therefore, there are still obvious interlayer interfaces between the inner layer, the transition gradient coating and the outer layer, and between the sub-tertiary layers, resulting in thermal stress mismatch phenomenon generated during preparation and use, and reducing the stability of the entire material component. Thermomechanical properties especially reduce the thermal shock resistance of the component

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