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Metal/ ceramic laser sintering product post-processing method

A technology of laser sintering and parts, which is applied in the field of rapid prototyping, can solve the problems of mechanical properties that cannot fully meet the requirements of use and low density, and achieve the effects of eliminating deviation, improving production efficiency, and simple sheathing

Active Publication Date: 2007-05-30
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After high-temperature sintering, the prototype has certain mechanical properties, but there are still many pores inside, the density is low, and the mechanical properties cannot fully meet the requirements of use. This porous part must be densified to improve its mechanical properties.

Method used

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  • Metal/ ceramic laser sintering product post-processing method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The preparation of metal / ceramic laser sintered parts can adopt the existing technology, and can adopt the following processing steps to carry out:

[0023] (1) Use 3D modeling software to design the CAD 3D model of the part, then process it with the slicing software and save it as an STL file, and send the data information of the STL file to the SLS rapid prototyping system.

[0024] (2) The powder feeding mechanism spreads a layer of powder to be processed (with a particle size of about 10-60 μm) with a thickness of about 0.02-0.2 mm on the working platform.

[0025] (3) Diode pumped YAG laser, fiber laser or CO with laser power greater than or equal to 50W 2 Laser, the laser spot is 10-250μm, the scanning distance is 0.04-0.2mm, and the scanning speed is 500-3000mm / s, scanning and sintering the powder located in this layer slice.

[0026] (4) Repeat the above steps (2)-(3) until the prototype of the desired shape is made.

[0027] The essence of the invention is to...

example 1

[0029] (1) First, according to the possible deformation of SLM parts after hot isostatic pressing, use 3D modeling software (such as UG, Pro / E, etc.) to design the CAD 3D model of the part before hot isostatic pressing, and then use the slicing software After processing, it is saved as an STL file, and the data information of the STL file is sent to the SLM rapid prototyping system.

[0030] (2) The powder feeding mechanism spreads a layer of stainless steel powder (particle size about 20 μm) with a thickness of about 0.1 mm on the working platform. The binder is epoxy resin with a content of about 4%.

[0031] (3) Use a diode-pumped YAG laser or fiber laser with a laser power greater than or equal to 50W. The laser spot diameter is about 50μm, the scanning speed is about 2000mm / s, and the scanning distance is about 0.1mm. Scan the sliced ​​powder located in this layer.

[0032] (4) Repeat the above steps (2)-(3) until a whole SLS part with the required shape is produced.

[...

example 2

[0040] (1) First, according to the possible deformation of SLM parts after hot isostatic pressing, use 3D modeling software (such as UG, Pro / E, etc.) to design the CAD 3D model of the part before hot isostatic pressing, and then use the slicing software After processing, it is saved as an STL file, and the data information of the STL file is sent to the SLM rapid prototyping system.

[0041] (2) The powder feeding mechanism spreads a layer of ceramic powder with a thickness of about 0.1 mm on the working platform (the main component is alumina, the particle size is about 80 μm), and the binder is epoxy resin. The content is about 5%.

[0042] (3) Use a diode-pumped YAG laser or fiber laser with a laser power greater than or equal to 50W. The laser spot is about 50μm, the scanning speed is about 2000mm / s, and the scanning distance is about 0.1mm. Scan the sliced ​​powder located in this layer.

[0043] (4) Repeat the above steps (2)-(3) until a whole SLS part with the required...

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Abstract

The invention discloses a post-treatment method of metal / ceramic laser sintering piece, which comprises the following steps: degreasing the metal / ceramic laser sintering piece; sintering under high temperature; jacketing the piece; placing in the cool isostatic pressing furnace; compressing; immersing the piece in the silica gel solution; attaching a layer of liquid on the surface evenly; heating the piece; forming closed protective film on the piece surface; proceeding subsequent manufacturing on the element; making the geometrical size and shape of element satisfy the need; combining SLS technique and CIP technique to form complex shaped structure and high-property piece.

Description

technical field [0001] The invention belongs to the technical field of rapid prototyping, in particular to a post-processing method for metal / ceramic laser sintered parts. Background technique [0002] Selective laser sintering (SLS) technology is a rapid prototyping technology that has developed very rapidly in recent years. It uses laser to selectively sinter solid powder in layers, and superimposes the solidified layers formed by sintering to generate parts of the desired shape. It can form a variety of powder materials such as metals, ceramics, and polymer materials. SLS technology has the advantages of short processing cycle, the ability to form parts with complex shapes and structures, high material utilization rate (up to 100%), and low cost. When using SLS technology to form metal / ceramic parts, it is necessary to add polymer powder materials with a lower melting point as a binder. Establish an initial connection. After high-temperature sintering, the prototype ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/02C04B41/48
Inventor 史玉升黄树槐刘锦辉张晶
Owner HUAZHONG UNIV OF SCI & TECH