Hot Press Sintering Method of Hollow Gradient Tube

Abstract

The invention discloses a hot pressing sintering method for a hollow gradient tube. The hollow gradient tube is formed by spraying process. In order to maintain the shape and composition distribution of the hollow tube, the slurry containing the low melting point glass body is sprayed on the innermost gradient tube to form an inner jacket; then the mold is filled with high melting point ceramic powder Hollow position; in hot-press sintering, a special indenter is used to transfer pressure to the gradient pipe by relying on the fluidity of the high-melting point powder to achieve hot-press sintering, while maintaining the shape and gradient distribution of the pipe during the sintering process. Based on the process method of centrifugal spraying, the present invention adopts the inner sheath and the filling of high-melting point powder to realize the densification and shape maintenance of the gradient composite material green body, not only the process is simple, but also the gradient thin-wall pipe fittings are greatly improved Preparation efficiency.

Description

technical field [0001] The invention relates to the field of gradient composite materials, and more specifically, to a hot-press sintering method for hollow gradient pipes. Background technique [0002] Functional graded material (Functional Graded Material, FGM) is the combination of two or more solid materials with different physical and chemical properties, through the use of advanced synthesis technology to change the microscopic elements (including composition, structure and voids) inside the material. A heterogeneous composite material in which the macroscopic properties of the material also present a continuous gradient change in the same direction as a continuous gradient change in a specific direction. FGM integrates the best advantages of various single phases (metals, ceramics, polymers, etc.), and its two-phase change is a uniform transition, which is essentially different from traditional composite materials and layered composite materials. The biggest advantag...

AI Technical Summary

Problems solved by technology

[0003] For gradient materials with special shapes, only the methods of centrifugal spraying and centrifugal sintering have been reported so far, but the pressure distribution of centrifugal sintering is uneven and the pressure is too small to achieve densification of materials.

Hot pressing sintering is currently the most commonly used pressure sintering method, but a single axial pressure method cannot achieve pressure and densification for such hollow pipes

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