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Degreasing method for photocuring additive manufacturing precious metal green body

An additive manufacturing and precious metal technology, applied in the field of additive manufacturing, can solve the problems of cracking, deformation, bubbling of green bodies, etc.

Pending Publication Date: 2022-01-28
西安汇创贵金属新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a method for degreasing precious metal green bodies by light-curing and additive manufacturing. deformation problem

Method used

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  • Degreasing method for photocuring additive manufacturing precious metal green body
  • Degreasing method for photocuring additive manufacturing precious metal green body
  • Degreasing method for photocuring additive manufacturing precious metal green body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A human tooth model made of silver is manufactured based on a light-curing additive manufacturing technology, wherein the light-curing additive manufacturing technology includes the thermal degreasing method of a precious metal green body.

[0046] In this embodiment, the particle size of the silver powder in the silver paste is 20 μm, and the volume ratio of the silver powder in the paste is 6%; the length of the silver powder green body is about 40 mm, and the maximum thickness is about 8 mm.

[0047] Thermal degreasing of tooth-shaped silver green bodies is carried out by the following methods:

[0048] Step 201: completely embed the tooth-shaped silver green body in a porous crucible provided with zirconia balls, wherein the diameter of the zirconia balls is 2mm;

[0049] Step 202: Transfer the porous crucible to a tube-type sintering furnace, feed ozone gas with a concentration of 3 g / h and a flow rate of 1 NL / min into the tube-type sintering furnace, and the tube-...

Embodiment 2

[0053] A sample model of a silver porous structure is manufactured based on a light-curing additive manufacturing technology, wherein the light-curing additive manufacturing technology includes a thermal degreasing method of a precious metal green body.

[0054] In this embodiment, the particle size of the silver powder in the silver paste is 20 μm, and the volume ratio of the silver powder in the paste is 6%. The silver green body with a porous structure has a length of about 25 mm, a width of about 20 mm, a height of about 10 mm, and a porosity of 80%.

[0055] The following method is used to thermally degrease the porous silver green body:

[0056] Step 301: completely embed the silver green body with a porous structure in a porous crucible provided with alumina powder, wherein the particle size of the alumina powder is 80 μm;

[0057] Step 302: Transfer the porous crucible to a tube-type sintering furnace, feed ozone gas with a concentration of 2 g / h and a flow rate of 1 ...

Embodiment 3

[0061] A porous ring sample model made of silver is manufactured based on light-curing additive manufacturing technology, wherein the light-curing additive manufacturing technology includes thermal degreasing of precious metal green bodies.

[0062] In this embodiment, the particle size of the silver powder in the silver paste is 15 μm, and the volume ratio of the silver powder in the paste is 15%. The diameter of the porous ring-shaped silver green body is about 32mm, the height is about 10mm, and the thickness of the ring body is about 3mm.

[0063] Thermal degreasing of the porous ring-shaped silver green body was performed using the following method:

[0064] Step 401: completely bury the porous ring-shaped silver green body in the porous crucible provided with alumina powder, wherein the particle size of the alumina powder is 100 μm;

[0065] Step 402: Transfer the porous crucible to a tube-type sintering furnace, feed ozone gas with a concentration of 5 g / h and a flow r...

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Abstract

The invention discloses a degreasing method for a photocuring additive manufacturing precious metal green body, which relates to the technical field of additive manufacturing. The method is used for solving the problems that when precious metal green bodies are degreased, due to the fact that a large number of organic matter in the green bodies cannot be effectively removed, the green bodies are prone to bubbling, cracking and deformation. The method comprises steps that a noble metal green body is put into a porous crucible provided with ceramic powder or ceramic balls; the porous crucible is placed in a tubular sintering furnace, ozone gas is introduced into the tubular sintering furnace, the tubular sintering furnace is heated to 500-550 DEG C at the heating rate of 0.5-3 DEG C / min, after heat preservation is conducted for 1-2 h, the green body is degreased, and the precious metal degreased blank is obtained.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a method for degreasing a precious metal green body manufactured by light-curing additive manufacturing. Background technique [0002] Noble metal materials (Au, Ag) cannot be processed by conventional metal additive manufacturing methods due to their strong light reflection, high thermal conductivity and high cost. Stereolithography (DigitalLight Processing, DLP) is an effective additive manufacturing method for preparing precious metal products with complex structures. The method is to compound ultrafine noble metal powder with photosensitive resin and other materials to prepare photosensitive noble metal precursor slurry, and then use ultraviolet light to polymerize the slurry layer by layer in any shape to achieve high-precision printing. [0003] The precious metal green body obtained by photocuring molding is a composite material of precious metal powder and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/64B22F10/12B33Y40/20B33Y10/00B22F3/10
CPCB22F10/64B22F10/12B33Y40/20B33Y10/00B22F3/1021Y02P10/25
Inventor 张超李中玺郑威孙浩张圣杰
Owner 西安汇创贵金属新材料研究院有限公司
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