Metal part and near-net forming method thereof

A metal parts, near net shape technology, applied in the field of additive manufacturing, can solve the problems of difficult size control, low sintering density, large shrinkage rate, etc., to achieve the effect of improving performance, improving dimensional accuracy, and improving density

Pending Publication Date: 2022-01-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a metal part and its near-net shape method, which can realize densification at a lower temperature and solve the problem of low sintered density in binder sprayed metal parts , high shrinkage, unevenness, and difficult size control, and can reduce the probability of large-sized pores, improve the uniformity of microstructure, and realize rapid moldless manufacturing of high-performance metal parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The near-net shape method of the metal parts provided by Embodiment 1 of the present invention mainly comprises the following steps:

[0043] (1) Select water-atomized 316L austenitic stainless steel powder with a particle size of 0.1 μm-~25 μm as the raw material, use binder jetting equipment to form it, and then place it in an oven for curing at 190°C for 3 hours, and clean the powder to obtain a metal blank; Among them, the layer thickness during spraying is set to 30 μm, and the binder saturation is set to 20%.

[0044] (2) Put the pre-sintered metal formed in step (1) in a degreasing furnace for pre-sintering, select the atmosphere as vacuum, keep it at 1080°C for 3 hours, and obtain a pre-sintered part after the furnace is cooled.

[0045] (3) Immerse the pre-sintered part of step (2) in a liquid A / B mixed room temperature self-curing silicone rubber with a Shore hardness of 25 degrees under vacuum conditions and seal it, cure it at room temperature for 12 hours, ...

Embodiment 2

[0048] The near-net shape method of the metal parts provided by Embodiment 2 of the present invention mainly comprises the following steps:

[0049] (1) Gas atomized pure Ti powder with a particle size of 10 μm to 62 μm was selected as the raw material, formed using a binder jetting equipment, and then placed in an oven for curing at 190°C for 3 hours, and the powder was cleaned to obtain a metal blank. Jetting was performed with a layer thickness setting of 100 μm and a binder saturation setting of 80%.

[0050] (2) Place the pre-sintered metal formed in step (1) in a degreasing furnace for pre-sintering, select the atmosphere as vacuum, keep it at 1360°C for 0.1h, and obtain a pre-sintered part after the furnace is cooled.

[0051] (3) Immerse the pre-sintered part of step (2) in the liquid A / B mixed room temperature self-curing silicone rubber with a Shore hardness of 45 degrees under vacuum conditions and seal it, cure it at room temperature for 6 hours, and then increase ...

Embodiment 3

[0054] The near-net shape method of the metal parts provided by Embodiment 3 of the present invention mainly includes the following steps:

[0055] (1) Select plasma-atomized NI 625 high-temperature nickel-based alloy powder with a particle size of 5 μm to 103 μm as the raw material, use a binder jetting equipment to form it, and then place it in an oven for curing at 190°C for 3 hours, and clean the powder to obtain a metal primary alloy. Blank. The layer thickness used during spraying was set to 200 μm, and the binder saturation was set to 100%.

[0056] (2) Put the pre-sintered metal formed in step (1) in a degreasing furnace for pre-sintering, select the atmosphere as vacuum, keep it at 830° C. for 24 hours, and obtain a pre-sintered part after cooling in the furnace.

[0057] (3) Immerse the pre-sintered part of step (2) in the liquid A / B mixed normal temperature self-curing silicone rubber with a Shore hardness of 10 degrees under vacuum conditions and seal it. Cold is...

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Abstract

The invention belongs to the related technical field of additive manufacturing, and discloses a metal part and a near-net forming method thereof. The near-net forming method comprises the following steps: (1) using metal powder and a binder as raw materials, adopting a binder spraying technology for jet printing to form a metal initial blank, and degreasing and pre-sintering the metal initial blank; and (2) coating the obtained pre-sintered part with silicone rubber to form a sheath; and then, conducting cold isostatic pressing treatment and sintering densification in sequence, and then obtaining the metal part. According to the method, densification can be achieved at the low temperature, the problems of low sintering density, large shrinkage rate, non-uniformity and difficulty in size control in the process of spraying the binder to the metal part are solved, the probability of size pores can be reduced, the uniformity of a microstructure is improved, rapid mold-free manufacturing of the high-performance metal part is achieved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field related to additive manufacturing, and more specifically relates to a metal part and a near-net shape method thereof. Background technique [0002] The binder jetting technology utilizes the array nozzle to selectively spray the binder on the paved metal powder bed according to the two-dimensional cross-sectional information to form the current layer, and then drop a layer thickness, and then spread it under the movement of the powder spreading rod or scraper. Flatten the required powder for the next layer, continue to selectively spray the binder, and bond it together on the previous layer, and accumulate and cycle layer by layer until the printing is completed; after printing, it is heated and solidified and the powder is cleaned to obtain a metal blank. After subsequent sintering, the blank can be directly formed into metal parts. The use of binder jetting technology can achieve high-efficiency, low-cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/10B22F10/14B22F10/20B22F3/04B22F3/10B22F3/16B33Y10/00B33Y80/00
CPCB22F10/14B22F10/10B22F10/20B22F3/04B22F3/1017B22F3/16B33Y10/00B33Y80/00Y02P10/25
Inventor 魏青松毛贻桅薛鹏举衡玉花蔡道生
Owner HUAZHONG UNIV OF SCI & TECH
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