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3-d printing of a ceramic component

A technology for components, ceramics, applied in the direction of ceramic molding machines, ceramic layered products, additive processing of mixtures of solid and liquid materials, etc., which can solve problems such as lack of uniformity

Pending Publication Date: 2018-07-17
SGL CARBON SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another disadvantage is that the joints may lead to a lack of uniformity in the material of the final part

Method used

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  • 3-d printing of a ceramic component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The wrought hard coal tar pitch coke was ground and after grinding and sieving had a particle size distribution of d10 = 130 μm, d50 = 230 μm and d90 = 390 μm and a shape factor of 0.69. A liquid sulfuric acid activator for phenolic resin was first added at 1% by weight based on the total weight of coke and activator to the coke, which was then machined through a 3D printing powder bed. In this process, a doctor blade device deposits a thin layer of coke powder (about 0.3mm in height) on a flat powder bed, and a type of inkjet printing device deposits an alcoholic solution of phenolic resin in accordance with the desired part geometry. Print on the coke bed. The print table is then lowered to an extent equal to the layer thickness, the scorched layer is reapplied, and the phenolic resin is partially printed on top of it again. Using the described iterative procedure, rectangular test specimens with dimensions 168 mm (length) x 22 mm (width) x 22 mm (height) were constr...

Embodiment 2

[0067] To unground wrought acetylene coke with a particle size distribution of d10=117 μm, d50=190 μm and d90=285 μm and a shape factor of 0.82 was added 0.35% by weight of the liquid activator of Example 1, followed by The coke is processed to form a green body.

[0068] The green body has a resin proportion of 3.0% by weight. The density of the green body is 0.98g / cm 3 , and thus significantly higher than the ground hard coal tar pitch coke from Example 1. Furthermore, the green body has a higher strength than the green body from Example 1, making it easier to handle. Thus, supplementary densification of the green body can be dispensed with, thereby reducing production costs.

[0069] The green body was placed directly (without prior separate carbonization) in a siliconization furnace and siliconized as in Example 1. Thus, the binder is carbonized and siliconized in one step.

[0070] analyze

[0071] The table below shows many of the physical and chemical properties...

Embodiment 11

[0082] Example 1.1: Hard coal tar pitch coke, the green body is additionally impregnated with phenolic resin, carbonized and silicified at 900°C.

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Abstract

The invention relates to a three-dimensional, ceramic component containing silicon carbide, to a method for producing the component, and to the use of the component. The method for producing a three-dimensional, ceramic component containing silicon carbide comprises the following steps: a) providing a powdery composition having a grain size (d50) between 3 microns and 500 microns and comprising atleast 50 wt% of coke, b) providing a liquid binder, c) depositing a layer of the material provided in a) in a planar manner and locally depositing drops of the material provided in b) onto said layerand repeating step c), wherein the local depositing of the drops in the subsequent repetitions of said step is adapted in accordance with the desired shape of the component to be produced, d) at least partially curing or drying the binder and obtaining a green body having the desired shape of the component, e) carbonizing the green body, and f) siliconizing the carbonized green body by infiltration with liquid silicon, wherein the green body, while above the melting temperature of silicon and while located substantially above the surface of a silicon bath, becomes saturated with silicon by capillary forces.

Description

technical field [0001] The invention relates to a three-dimensional ceramic component comprising silicon carbide, a method for producing the component and the use of the component. Background technique [0002] Silicon carbide ceramics are known for their hardness, wear resistance, chemical stability and temperature resistance. One way to produce the material is to compress carbon-containing fillers with a binder so that they harden to form a green body. The green body is then carbonized or pyrolyzed at high temperature to form a carbon body, which is finally infiltrated with liquid silicon, which reacts with the silicon and forms SiC. Usually, what is obtained with this method is a composite material containing unreacted carbon and free silicon in addition to SiC. Therefore, this material is called C / Si / SiC composite. [0003] Machining silicon carbide ceramics is very difficult due to the hardness of the material. Thus, more complex structures made of silicon carbide c...

Claims

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Application Information

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IPC IPC(8): B32B18/00C04B35/532C04B35/573C04B35/626B28B1/00B29C67/00B33Y10/00
CPCB28B1/001B32B18/00C04B35/532C04B35/573C04B35/62695C04B2235/3427C04B2235/422C04B2235/483C04B2235/5296C04B2235/5427C04B2235/5436C04B2235/5463C04B2235/6026C04B2235/608C04B2235/616C04B2235/6581C04B2235/77C04B2235/96C04B2235/9607C04B2237/363C04B2237/365C04B2237/58C04B2237/61C04B2237/62B33Y10/00B29C64/165B33Y70/10F16D69/023B33Y80/00C04B35/515C04B35/565C04B35/62886C04B35/63488C04B35/657C04B2235/428C04B2235/85
Inventor 奥斯温·奥廷格多米尼克·里沃拉斯特凡·克勒因安德烈亚斯·金茨勒英格丽德·克雷奇默
Owner SGL CARBON SE
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