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Near-net-shape method for porous metal part

A near-net-shaping, porous metal technology, applied in the field of rapid prototyping technology and powder loose-pack sintering composite forming, can solve the problems that affect the dimensional accuracy of parts, difficult to directly form parts, and cannot be directly formed, so as to avoid dimensional deviation and avoid Machining, avoiding the effect that the porosity is not easy to control

Active Publication Date: 2012-01-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) It is difficult to directly form parts with arbitrary complex shapes by powder loose sintering method
The application of porous materials requires a certain complex shape, and LPS is limited and cannot be directly formed
Machining is required in actual production. This method not only has cumbersome process and low production efficiency, but also causes waste of materials.
[0006] (2) Powder loose-pack sintering needs to be formed with a mold. After powder sintering, the part needs to be removed from the mold. Therefore, the design of the mold and the sintering process are very important, and a slight deviation will affect the dimensional accuracy of the part.

Method used

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  • Near-net-shape method for porous metal part
  • Near-net-shape method for porous metal part

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] (1) Use 3D modeling software (such as UG, Pro / E, etc.) to design the CAD 3D model of the porous part, then process it with the slicing software and save it as an STL file, and input the data information of the STL file to the SLM rapid prototyping equipment.

[0036] (2) Spread a layer of 316L stainless steel powder with a thickness of about 0.1-0.2mm on the metal substrate by the powder feeding mechanism. The particle size of the stainless steel powder is about 10-100 μm, and the powder contains 10wt% methylcellulose as a loosening agent .

[0037] When methyl cellulose is used as the bulking agent, its addition can generally be 5-40 wt%.

[0038] (3) A YAG laser or a fiber laser with a laser power of 100 W is used to scan the boundary of the slice contour and melt the powder at the boundary, wherein the scanning speed is 150 mm / s.

[0039] (4) Repeat the above steps (2)-(3) until the shell processing of the entire part is completed. At this time, the metal shell is t...

example 2

[0044] (1) Use 3D modeling software (such as UG, Pro / E, etc.) to design the CAD 3D model of the porous part, then process it with the slicing software and save it as an STL file, and input the data information of the STL file to the SLM rapid prototyping equipment.

[0045] (2) Spread a layer of iron powder with a thickness of about 0.1-0.2 mm on the metal substrate by the powder feeding mechanism, the powder particle size is about 10-100 μm, and boric acid is contained as a loosening agent in an amount of 2 wt%.

[0046] When boric acid is used as the loosening agent, its addition amount can generally be 1-4wt%.

[0047] (3) A YAG laser or a fiber laser with a laser power of 100 W is used to scan the boundary of the slice contour and melt the powder at the boundary, wherein the scanning speed is 100 mm / s.

[0048] (4) Repeat steps (2)-(3) until the iron shell with a certain shape is processed, a small hole is left on the upper part of the iron shell, and the loose powder insi...

example 3

[0053] (1) Use 3D modeling software (such as UG, Pro / E, etc.) to design the CAD 3D model of the porous part, then process it with the slicing software and save it as an STL file, and input the data information of the STL file to the SLM rapid prototyping equipment.

[0054] (2) Spread a layer of iron powder with a thickness of about 0.1-0.2mm on the metal substrate by the powder feeding mechanism.

[0055] (3) A YAG laser or a fiber laser with a laser power of 100 W is used to scan the boundary of the slice contour and melt the powder at the boundary, wherein the scanning speed is 140 mm / s.

[0056] (4) Repeat steps (2)-(3) until the iron shell with a certain shape is processed, a small hole is left on the upper part of the iron shell, and the loose powder inside is poured out. At this time, the iron shell is for subsequent loose packing and sintering mold required.

[0057] (5) Fill the iron shell with Ti powder, which is used for subsequent loose-pack sintering.

[0058] (...

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Abstract

The invention discloses a near-net-shape method for a porous metal part. The method comprises the following steps: (1) firstly, designing a three-dimensional CAD model of the part, saving the model as an STL file, and transmitting the file to SLM quick shape equipment; (2) introducing protective gas into the equipment after the equipment is vacuumized; (3) spreading a layer of metal powder with thickness of between 0.05 and 0.15millimeter and grain diameter of between 10 and 100 mu m on a metal substrate by a powder feeding mechanism; (4) scanning the outer profile of the boundary of a slice by adopting a laser beam of which the laser power is more than or equal to 100W to ensure that the profile is melted; (5) repeating the step (3) to (4) until shaping is completed; and (6) integrally placing a shell of the shaped part and powder loaded in the shell in a high temperature sintering furnace for sinter shaping. The method does not need a die, and has the characteristics of simple and easy technical process and complicated shape manufacture.

Description

technical field [0001] The invention belongs to the field of rapid prototyping technology and powder loose-pack sintering composite forming, and specifically relates to a method for near-net-shaping porous metal parts. Background technique [0002] A porous material is a material composed of a metal skeleton and pores. Compared with dense materials, porous materials are typically characterized by a large number of pores inside. Therefore, porous metal has the following excellent properties, such as low density, large specific surface area, low thermal conductivity, high heat dissipation capacity, strong permeability, strong energy absorption and sound absorption, and good biocompatibility. In recent years, porous material parts have been widely used, such as biomaterial devices, shock absorbers, buffers, filters, energy absorbers, fluid permeators, heat exchangers, fire extinguishers, engine exhaust Mufflers, metal electrodes and more. [0003] Loose Powder Sintering (LPS...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11
Inventor 史玉升李瑞迪王志刚魏青松
Owner HUAZHONG UNIV OF SCI & TECH
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