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Method for improving degreasing strength of additive manufacturing formed ceramic part

A technology for ceramic parts and additive manufacturing, which is applied in the field of improving the degreasing strength of additively manufactured ceramic parts. It can solve the problems that the viscosity of ceramic slurry is greatly affected and cannot meet the requirements of slurry preparation, so as to avoid drying cracks and improve degreasing. Strength and low pyrolysis loss rate

Inactive Publication Date: 2019-03-29
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

However, the above materials have a great influence on the viscosity of the ceramic slurry and cannot meet the requirements of slurry preparation
The same problem exists in the preparation of fiber reinforced parts

Method used

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  • Method for improving degreasing strength of additive manufacturing formed ceramic part
  • Method for improving degreasing strength of additive manufacturing formed ceramic part
  • Method for improving degreasing strength of additive manufacturing formed ceramic part

Examples

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specific Embodiment

[0042] The indirect additive manufacturing of ceramic parts is realized by adopting the molding process of ceramic parts based on light-cured resin prototypes. 1-5wt% polydimethylsiloxane (PDMS) was added to the raw materials to make standard samples, and compared with samples without any binder, in order to analyze the effect of PDMS on the medium temperature strength influences.

[0043] The composition of raw materials in Examples 1-6 is shown in Table 1.

[0044] Table 1 Composition of the ceramic body sample containing polydimethylsiloxane

[0045]

[0046] A standard sample was prepared by pouring a resin mold with a ceramic slurry with a solid content of 60vol%. After the sample was freeze-dried, refer to the HB 5353.3-2004 testing standard, and use a high-temperature stress-strain testing machine to measure the temperature of the sample from 200°C to 600°C. three-point flexural strength.

[0047] The bending strength of the sample body at 200-600°C during the deg...

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Abstract

The invention discloses a method for improving the degreasing strength of an additive manufacturing formed ceramic part. The method comprises the following steps that polydimethylsiloxane is added into a ceramic powder material, and required raw material powder is obtained after even dispersing; the powder material and a liquid phase solvent are mixed, and ceramic slurry is prepared after even ball-milling; a ceramic part blank is formed through an additive manufacturing method, and after the blank is dried, degreasing and glue discharging are conducted; and in the degreasing heating process,the polydimethylsiloxane is softened and molten to permeate into adjacent ceramic particle gaps, and ceramic particles are wrapped. The polydimethylsiloxane is simple in molecular structure, low in carbon content and low in pyrolysis ignition lost rate, thus the wrapping bonding effect on the ceramic particles is small along with thermal attenuation of the temperature, the degreasing strength of the part can be established, and it is ensured that the blank has the sufficient strength margin to resist damage of gravity and thermal stress in a degreasing technology. The method can be used for improving the degreasing strength of the additive manufacturing ceramic part, and is especially suitable for additive manufacturing forming of ceramic parts of complex structures.

Description

technical field [0001] The invention belongs to the field of additive manufacturing of ceramic parts, and in particular relates to a method for improving the degreasing strength of additively manufactured ceramic parts. Background technique [0002] The ceramic parts formed by the additive manufacturing method need to be processed after sintering to obtain the required properties. The role of post-sintering treatment is to remove the organic binder inside the green body, promote the sintering between ceramic particles, and build up structural strength. In the degreasing stage of the post-sintering treatment of the green body, the organic binder in the green body is continuously burned out. At this time, due to the low temperature, the ceramic particles in the green body cannot form a sintered bond, and only rely on the friction between the particles. The effect is to maintain the shape of the part, so the strength is low. By increasing the degreasing strength of the green ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/14C04B35/185C04B35/638C04B35/634
CPCC04B35/10C04B35/14C04B35/185C04B35/634C04B35/638C04B2235/3206
Inventor 苗恺鲁中良李涤尘陈义
Owner XI AN JIAOTONG UNIV
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