Yttrium oxide-tungsten continuous gradient material, preparation method of yttrium oxide-tungsten continuous gradient material, and application of yttrium oxide-tungsten continuous gradient material in manufacturing of crucible for metal smelting

Abstract

The invention relates to an yttrium oxide-tungsten continuous gradient material, a preparation method of the yttrium oxide-tungsten continuous gradient material, and application of the yttrium oxide-tungsten continuous gradient material in manufacturing of a crucible for metal smelting. The gradient material comprises a tungsten layer with the thickness l0, a yttrium oxide layer with the thickness l1, and a transition layer which has the thickness l2 and is provided with a tungsten-rich surface and a yttrium oxide-rich surface, wherein l0 and l1 are independently equal to or greater than zero, and l2 is greater than zero; and the volume fraction of yttrium oxide of the position, z distance away from the tungsten-rich surface, in the transition layer is calculated according to a formula (please see the specification for the formula), and the volume fraction of tungsten of the position, z distance away from the tungsten-rich surface, in the transition layer is calculated according to a formula (please see the specification for the formula), wherein l=l0+l2, p=0.7, and l0<=z<=l. According to the preparation method, a free sedimentation method is preferably adopted and combined with a cold press molding and sintering process, the process is simple, operation is easy, energy consumption is low, and environmental friendliness is achieved. The invention further provides the application of the gradient material in metal smelting. According to the material, thermal shock resistance and high-temperature mechanical performance are improved while excellent ablation resistance is achieved, pollution caused by smelting of precious metal and high-temperature alloy is avoided, and industrial application prospects are broad.

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 metal smelting 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. Vacuum induction crucible melting is the most commonly used technology for smelting superalloys. Strong electromagnetic stirring is beneficial to eliminate composition segregation in alloys and obtain alloys w...

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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