Preparation method for quick preparing functional gradient material

Abstract

The invention discloses a rapid making method of functional gradient material, which comprises the following steps: grading the dosage according to the component ratio; affirming the laser manufacturing technological parameter for each layer; preheating each layer of powder to do thermal-insulating disposal; paving the powder on the working bench through powder feeding device; scanning layer by layer to realize the preparation of functional gradient material.

Description

technical field [0001] The invention belongs to the field of advanced rapid manufacturing, in particular to a preparation method for rapid manufacturing of functionally gradient materials (Functionally Gradient Materials, referred to as FGMs). Background technique [0002] FGMs is a new type of functionally graded material, which requires the components or internal structure of the material to be regularly distributed along a certain direction, so that a certain property of the material can produce continuous or gradient changes along this direction. The application fields of FGMs range from a single aerospace to nuclear energy, electronic materials, optical engineering, chemical engineering and biomedicine, and continue to expand. The traditional manufacturing methods of FGMs include: powder metallurgy, electroplating, self-propagating combustion high-temperature synthesis, plasma spraying, electrodeposition, centrifugal casting, etc. For example, the powder metallurgy met...

AI Technical Summary

Problems solved by technology

The manufacturing advantage of SLS is that it does not require support and is not limited by complex structures and shapes, but its low density and insufficient strength are major defects

In China, Harbin Institute of Technology uses a combination of laminated molding system (LOM) and self-propagating (SHS) to manufacture TiC / Ni FGMs, in which LOM is used for material forming, and SHS is used for sintering and densification of material blanks. The process is cumbersome and difficult to control

[0004] Practice has proved that it is feasible to fabricate FGMs with existing rapid prototyping techniques, but there are many disadvantages, such as: debonding and high-temperature post-treatment sintering are required, while considering the sintering rates of different phases in the material, it is difficult to avoid shrinkage and deformation, Low density and poor mechanical properties, etc.