Method for preparing high-temperature alloy honeycomb insulation board based on injection forming

Abstract

The invention relates to the technical field of metal injection forming, and particularly relates to a method for preparing a high-temperature alloy honeycomb insulation board based on injection forming. The method comprises the steps of S1, preparation of mother alloy powder, S2, feeding and pelleting, S3, injection forming, S4, degreasing, S5, sintering, S6, hot isostatic pressing, S7, solid solution and aging treatment and other steps. By adopting the method for preparing the high-temperature alloy honeycomb insulation board, the defects that traditional brazing processes are complex in machining process, high in manufacturing cost and low in size precision can be effectively overcome, and the comprehensive mechanical properties of the prepared high-temperature alloy honeycomb insulation board are better than those of honeycomb boards prepared through brazing methods.

Description

technical field [0001] The invention relates to the technical field of metal injection molding, in particular to a method for preparing a superalloy honeycomb heat insulation board based on injection molding. Background technique [0002] The excellent characteristics of honeycomb panels make it widely used in aerospace, trains, ships and construction fields. Because of the different application fields of honeycomb panels, the constituent materials of honeycomb panels vary. For honeycomb panels used in the aerospace field, there is no doubt that the requirements for their mechanical properties and high-temperature performance are more stringent. The use of high-temperature alloy honeycomb panels as the outer panel of the thermal protection system of aerospace vehicles can not only ensure that the internal structure does not overheat and burn, but also can withstand large external stress loads. [0003] At present, the honeycomb core used in the commonly used brazing method...

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Problems solved by technology

[0003] At present, the honeycomb core used in the commonly used brazing method has problems such as composition segregation and abnormal grain growth, which leads to a decrease in the toughness and processing performance of the material, and cannot give full play to the excellent performance of the superalloy. In addition, the brazing honeycomb plate process has processing accuracy. Low, high post-processing costs and other defects

[0004] At present, nickel-based superalloy powder for injection molding mainly adopts plasma rotating electrode atomized alloy powder or inert gas atomized alloy powder. The superalloy powder prepared by plasma rotating electrode atomization has a large particle size, which is suitable for fine powder (≤10μm) of injection molding process. ) ratio is extremely low (≤10%), and the fine powder rate of superalloy powder prepared by inert gas atomization has increased, but it is still low (≤40%), so the material utilization rate is low and the cost of raw materials is high

On the other hand, the sintering activity of superalloy powder is low, and it often needs to be sintered for a long time above 1280 ° C, and the relative density of more than 96% can only be obtained after a sufficient amount of liquid phase is formed.

Sintering at high temperature for a long time not only increases energy and equipment consumption, but also makes it more difficult to control sintering deformation due to the appearance of a large number of liquid phases, resulting in large deformation of sintered products and low dimensional pass rate

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