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Method for preparing non-homogenous parts by deposition

A non-homogeneous, layered technology, applied in metal material coating process, melt spraying, coating and other directions, can solve the problems of complex preparation process and so on

Inactive Publication Date: 2009-08-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method first requires powder making, then three-dimensional printing to prepare the prototype, and finally two sinterings. Among them, powder making requires mixing, drying, ball milling and screening to complete the process, and the preparation process is relatively complicated.

Method used

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  • Method for preparing non-homogenous parts by deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: with reference to accompanying drawing. Put the Al profile into the crucible 12, put the Ti powder into the powder hopper 9, and seal the powder hopper 9.

[0018] After evacuating the vacuum chamber 1, fill it with argon gas to keep the pressure in the vacuum chamber 1 consistent with the atmospheric pressure, and cycle twice to make the oxygen content below 10ppm, so as to prevent the Al profile from being oxidized after heating and melting.

[0019] Turn on the vibration powder feeding control module 3, turn on the powder delivery control switch 8, so that Ti powder enters the capillary 6 through the powder delivery tube 7; when there is less powder in the capillary 6, turn on the powder delivery control switch 8 again to supplement the capillary 6 pink. Start the ultrasonic transducer 5 to apply vibration to the capillary 6, so that the powder is filled with the capillary 6 and the powder can be fed stably, then the vibration is stopped, and the powde...

Embodiment 2

[0029] Example 2: SiC p Preparation of Mg-based composite parts locally reinforced by particles.

[0030] It is required to prepare SiC with the heights of the upper, middle and lower sections being 10mm respectively and the weight percentage of each section's reinforcement is different. p / Mg composite material, where the upper and lower ends of SiC p The volume percentage of the reinforcement is 15%, and the middle part is SiC p The volume percentage of reinforcement is 10%. Three-dimensional modeling is performed according to the geometric size and material information of the part to generate two-dimensional layer data. The thickness of the layer is still 100 μm, so the number of layers in each segment is 100. Then, according to the level data, the numerical control code of substrate movement and the switch control signal of droplet and powder ejection are generated.

[0031] Put the Mg profile into the crucible 12, put the SiC p The particles are put into the powder h...

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Abstract

The invention discloses a method for preparing non-homogenous parts by deposition, which adopts a pneumatic injection method based on droplets as required to obtain uniform metal droplets and adopts a method of capillary micro-feeding powders by ultrasonic vibration to realize powder feeding. The method comprises the following steps: geometry information and material information on each layer of the parts are extracted by level algorithm according to mathematical models of the parts, substrate movement trajectory corresponding to the level of each layer is simultaneously generated; substrate movement, droplet injection and powder deposition are harmoniously controlled by programming, thus finishing the preparation of the non-homogenous parts. As the droplet and the powder are directly combined together, the non-homogenous parts can be obtained without carrying out secondary sintering. Smooth injection can be ensured only by heating one of the metals to the temperature over the melting point, without carrying out high temperature solid infiltration and sintering; the preparation temperature of the non-homogenous parts is lowered from 1300-1600 DEG C in the prior art to the temperature within 1000 DEG C and the requirements on the equipments are lower. Meanwhile, injection of fixed amount in fixed points as required can be carried out based on the special using requirements of the parts, thus realizing the preparation of ideal non-homogenous parts.

Description

technical field [0001] The invention relates to a method for preparing heterogeneous parts by deposition, especially a method for preparing heterogeneous parts by joint deposition of molten droplet / powder. Background technique [0002] Literature "R. Melcher, S. Martins, N. Travitzky, P. Greil. Fabrication of Al 2 o 3 -based composites by indirect 3D-printing.Materials Letters.2006, 60:572-575" discloses a method for preparing aluminum-based ceramic metal composites by indirect 3D printing. Infiltration and sintering, other metal powders are infiltrated into porous samples to obtain dense parts. Powder making requires Al 2 o 3 And dextrin, dispersant and other powders go through multiple processes such as mixing, drying, ball milling and screening. Then three-dimensional printing was carried out to prepare the initial state crucible, in which the liquid droplets used to bond the powder were distilled water. The crucible in the initial state is gradually heated for degre...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C24/00B22F3/115
Inventor 齐乐华曾祥辉黄华罗俊晁艳普杨方
Owner NORTHWESTERN POLYTECHNICAL UNIV
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