Centrifugal sintering method for functionally graded material of thin-wall pipe fitting

Abstract

The invention discloses a centrifugal sintering method for a functionally graded material of a thin-wall pipe fitting. The centrifugal sintering method for the functionally graded material of the thin-wall pipe fitting comprises the following steps of mixing two evenly distributed powder, a solvent and a dispersing agent, stirring in air, and vacuum degassing to form an even slurry; loading the slurry into a pulp spraying machine, then stretching a spraying head into a base plate in a centrifugal machine, and evenly spraying the slurry onto the inner wall of the base plate; changing the relative volume percentage of the two powder, and forming a second layer of composite material layer; repeating the steps, and forming multilayer spraying; stretching a graphite radiation heating element into an inner cavity of the base plate, electrifying, moving up and down, installing a layer of heat insulation layer on the outer wall of the base plate, and electrifying the heat insulation layer; andturning off the centrifugal machine, sintering a green body, taking the green body out from the base plate, and obtaining a hollow pipe fitting. According to the centrifugal sintering method for thefunctionally graded material of the thin-wall pipe fitting provided by the invention, through adding the graphite radiation heating element, and installing the heat insulation layer on the outer layerof the base plate, the even temperature gradient is realized internally, so that an effective guarantee is provided for preparing the uniform and compact thin-wall pipe fitting.

Description

technical field [0001] The invention relates to centrifugal sintering of gradient composite materials, which belongs to the field of powder metallurgy and composite materials, in particular to a centrifugal sintering method of functionally gradient materials for thin-walled pipe fittings. Background technique [0002] Gradient functional material is a new type of functional composite material. Its two sides are composed of materials with different properties, and the composition and structure of the middle part change continuously in a gradient, so that the properties and functions of the material also change in a gradient along the thickness direction. The performance mismatch factor of combining different materials is overcome, so that the advantages of the two materials can be fully utilized. [0003] The main problems of present preparation method: [0004] (1) The material preparation method mainly adopts the high temperature method, which consumes a lot of energy; ...

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Problems solved by technology

[0004] (1) The material preparation method mainly adopts the high temperature method, which consumes a lot of energy;

[0005] (2) The size of the prepared material is small, and it is not easy to prepare samples with complex shapes;

[0006] (3) There are more or less interface and distribution inhomogeneities in the material. Due to the limitation of the preparation method, there is a step gradient, and the material distribution cannot be smoothly distributed. During the process of thermal shock or thermal cycle, there is still a large stress in the material

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