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Rapid degreasing and sintering method for photocuring shaped ceramic body

A technology of photocuring molding and ceramic body, applied in the field of additive manufacturing, can solve the problem of long process and achieve the effect of improving mechanical properties

Inactive Publication Date: 2019-10-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the ceramization process of the light-cured 3D printed alumina ceramic body, degreasing is required to remove a large amount of organic matter contained in the ceramic body. However, controlling the smooth progress of the degreasing process is one of the main technical bottlenecks in the ceramization process. Existing The degreasing process is mainly set with a heating rate of 0.2-1°C / min and an uninterrupted holding time. The process is long, and it often takes 50-100 hours to complete the degreasing

Method used

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  • Rapid degreasing and sintering method for photocuring shaped ceramic body
  • Rapid degreasing and sintering method for photocuring shaped ceramic body
  • Rapid degreasing and sintering method for photocuring shaped ceramic body

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Embodiment 1

[0030] A method for rapid degreasing and sintering of a light-cured and molded ceramic green body, the steps are as follows:

[0031] (1) Vacuum degreasing: Place the alumina ceramic cuboid body on the alumina ceramic platform and transfer it to a vacuum furnace. -3 ~5×10 -1 Under the vacuum condition of Pa, with a heating rate of 1°C / min and 1h every time the temperature reaches the hundredth place during the heating process (that is, when the temperature is raised to 100°C, 200°C, 300°C, 400°C, and 500°C, keep the temperature for 1h respectively) Keep warm, raise the temperature to 600°C and keep warm for 1h;

[0032](2) Air oxidation carbon removal: when the vacuum furnace in step (1) is naturally cooled to 350 ° C, the vacuum pump is turned off and kept at this temperature for 2 hours. Air is introduced into the vacuum furnace at a rate of min so that the volume fraction of oxygen in the vacuum furnace is within the range of 15-20%;

[0033] (3) Vacuum sintering: After ...

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Abstract

The invention relates to a vacuum-air-vacuum rapid degreasing and sintering method for a photocuring shaped ceramic body.The photocuring shaped ceramic bodyis placed in a foamed alumina ceramic platform to be transferred along into a vacuum oven, under the vacuum condition of 1x10<-3> to 5x10<-1>Pa, the temperature is raised to 550 to 650 DEG C and maintained for 1 to 2 h at a heating rate of 0.5to 2 DEG C / min through intermittent heat preservation during heating; after carbonization of the ceramic body is completed, the temperature of the vacuum oven is naturally lowered to 300 to 400 DEG Cand kept for 1 to 2 hours,a vacuum pump is turned off, air is slowly introduced into the vacuum oven at a rate of 0.1 to 1 L / min so that carbon reserved in the ceramic body slowly reacts with oxygen to form carbon dioxide to escape,when holding time is up, the vacuum pump is opened, the temperature is raised to a sintering temperature of the ceramic at a rate of 3 to 5 DEG C / min and maintained, air oxidation after vacuum carbonization prevents the residual small amount of carbonfrom affecting the properties of sintered ceramics.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a rapid degreasing and sintering method for a light-cured and molded ceramic body. Background technique [0002] Due to its high hardness, strength, good wear resistance, thermal stability, chemical stability and biocompatibility, ceramic materials are widely used in aerospace, machinery, electronics, semiconductors, etc. field. The traditional ceramic manufacturing methods are mainly gel injection molding and dry pressing. These manufacturing methods all require the use of molds. When manufacturing fine and complex ceramic products, the mold manufacturing is difficult and the manufacturing cycle is long, which cannot meet the personalized production of small batches. With the development of additive manufacturing technology, 3D printing technologies such as laser 3D printing and light curing 3D printing are used to prepare ceramics. In recent years, the focus ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/10B33Y70/00B33Y10/00
CPCC04B35/64C04B35/10B33Y70/00B33Y10/00C04B2235/6581C04B2235/6562C04B2235/6567C04B2235/6583C04B2235/96C04B2235/77
Inventor 章桥新朱迪周晨喻志强董超
Owner WUHAN UNIV OF TECH
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