Method for realizing near-net-shape forming of ceramic structure by laser beam

Abstract

The invention discloses a method for realizing near-net-shape forming of a ceramic structure by a laser beam. The method is characterized in that a laser beam Nd: YAG is divided into a main laser beam and an auxiliary laser beam by a beam splitter; the main laser beam orderly passes through a beam expanding and beam correction system, a holophote A, an optical switch, a focusing lens and a coaxial nozzle; the focused main laser beam heats ceramic powder until the ceramic powder is melted so that a ceramic structure is formed on a substrate through layer-by-layer accumulation; the auxiliary laser beam orderly passes through a holophote B, a holophote C, an optical integrator and a columnar prism and is utilized for providing preheating and slow-cooling temperature conditions to the formed ceramic structure in a main beam active zone, and the ceramic powder is heated and melted by the focused main laser beam so that the layer-by-layer accumulation of the ceramic structure is realized under the control of a preset digital control program. Through the method, a compact ceramic microstructure can be obtained; a temperature gradient of a forming process is reduced; crack defect appearance probability is reduced effectively; a complex ceramic structure can be directly formed; and unnecessary subsequent processing processes are reduced.

Description

technical field [0001] The invention relates to a ceramic structure forming method, in particular to a laser beam near net forming ceramic structure method. Background technique [0002] With the rapid development of the world's industrial level and advanced manufacturing technology, the requirements for the service life of parts in special environments continue to increase, and the performance of metal materials in high-temperature corrosion, insulation and high-wear environments has been difficult to meet the requirements. Ceramic materials have the characteristics of high hardness, high melting point, and high chemical stability. They can not only be widely used in traditional industrial fields, but also have very important application values ​​in aerospace, national defense, and high-tech fields. Therefore, ceramic structural parts have penetrated into industrial fields with special environmental conditions. The existing ceramic structure forming includes the following ...

AI Technical Summary

Problems solved by technology

[0004] 1) The sintered structure is relatively loose and often accompanied by defects;

[0005] 2) The post-processing process is cumbersome, which affects the stability and service life of ceramic structural parts;

[0006] 3) Difficult to sinter and form complex ceramic structures

The disadvantage of this method is that the crack defect is obvious, which affects the service life of the ceramic structure

Images