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Herbst bremer goldschlaegerei

A technology of ceramic crucible and ceramics, which is applied to the equipment for implementing the production method of ceramic crucibles, and the field of preparing ceramic crucibles, can solve the problems not mentioned in the production of ceramic crucibles, and achieve good processing and operation characteristics, precise geometry, and good resistance to metal melting The effect of bulk chemical corrosion ability

Inactive Publication Date: 2006-06-21
BEGO BREMER GOLDSCHLAGEREI WILH HERBST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reference can also be made to the document DE 10335224 A1 (University of Bremen) published on March 24, 2005, which relates to a method and slurry for producing shaped articles from ceramic materials, ceramic shaped articles and the use of such shaped articles, But there is no reference to the production of ceramic crucibles; publication WO2005 / 012205 (University of Bremen) corresponds to this document

Method used

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  • Herbst bremer goldschlaegerei

Examples

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Comparison scheme
Effect test

Embodiment 1

[0101] A method of preparing a ceramic crucible according to an embodiment of the present invention is described below. Mix silica hydrosol with alumina powder and mullite powder by stirring, and add glycerin.

[0102] SiO in hydrated silica 2 The median diameter of particle diameter distribution (d 50) is 8nm. The diameter of the alumina powder particles is less than 10 μm, and the diameter of the mullite powder particles is less than 80 μm. Such a sol is industrially produced, for example, by acidifying a sodium silicate solution, passing the solution through a cation exchanger and basifying the obtained sol. Such sols are sold by CWK.

[0103] Material

g

weight%

Mullite

100

50.9

Aluminum oxide

45

22.9

SiO 2 sol

50

25.4

Glycerol

1.5

0.8

total

196.5

100.0

[0104] This mixture is a freeze-castable slurry, that is, a special settable slurry. The ...

Embodiment 2

[0111] Another embodiment of the method according to the invention is described below. SiO 2 The hydrosol is mixed with alumina, mullite, and Nb powder by stirring, and glycerol is added. Alumina, mullite, and SiO 2 The diameters of the particles were the same as those described in Example 1. The diameter of the Nb particles is less than 40 μm.

[0112] Material

[0113] The slurry prepared in this way was poured into metal casting molds as in Example 1 and frozen in a freezer at -40°C. The obtained preform body was demoulded, and then dried in a drying room with a relative humidity of 30%, a pressure of 1013 hPa, and a temperature of 60°C. The preform was then sintered in air at 1200°C for 3 hours. During sintering, the niobium powder oxidizes (due to the presence of oxygen in the air) to form niobium pentoxide which results in an increase in volume.

Embodiment 3

[0116] The slurry prepared in this way was poured into a metal casting mold as in Example 1 and frozen at -40° C. using a cryostat. The obtained preform body was demoulded, and then dried in a drying room with a relative humidity of 30%, a pressure of 1013 hPa, and a temperature of 60°C. Then, the preform body is first heated to 600° C. to 700° C. for 2 hours, and then sintered at 1200° C. in air for 3 hours. When the temperature of the preform body is between 600°C and 800°C, the AlMg5 powder is liquefied and oxidized to produce alumina, magnesia, and spinel, and the volume increases at the same time. This alternative embodiment of the method results in a particularly low porosity.

[0117] In both alternative embodiments, the volume increase that occurs compensates for the sintering shrinkage of the other components such that the sintered preform dimensions deviate by less than 1% from the pre-sintered preform dimensions.

[0118] The above-described methods accordi...

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Abstract

The invention relates to a method for preparing a ceramic crucible. The following steps are proposed: providing a curable slurry; providing a casting mold (10) for a ceramic crucible, pouring the slurry into the casting mold, allowing the slurry to solidify in the mold by: (a) freezing and / or (b ) changing the pH value of the slurry to obtain a preformed body, and heat-treating the preformed body to obtain a ceramic crucible. The present invention also relates to a ceramic crucible prepared by said method and a complete set of equipment for preparing said ceramic crucible, comprising: a casting mold for a ceramic crucible, preferably a metal mold; a sol, preferably SiO2 water containing nano-ceramic particle components Sols; ceramic particles comprising particulate ceramic components; optionally metal powders consisting of metals and / or alloys and / or intermetallic compounds; optionally one or more other additives and optionally organic or inorganic binders . The invention also relates to a device for carrying out the method.

Description

technical field [0001] The invention relates to a method for preparing a ceramic crucible. The invention also relates to ceramic crucibles, a complete set of equipment for preparing ceramic crucibles and equipment for implementing the production method of ceramic crucibles. technical background [0002] It is known to prepare ceramic crucibles by injecting a slurry into absorbent porous plaster molds. The slurry comprises a suspension which can be absorbed by an absorbent plaster mold. The ceramic layer is formed on the wall of the plaster mold through the ejection of the suspension, and this process continues until the ceramic layer reaches the required thickness, and then the formed ceramic body is demolded and sintered to prepare a ceramic crucible. [0003] According to a variant, hollow cast plaster molds are used as plaster molds. After the slurry has been poured into the plaster mold and the resulting green body has reached the desired thickness, excess slurry is p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66B28B1/14C04B35/00C04B35/622
CPCB28B1/007B28B7/40B82Y30/00C04B35/185C04B35/624C04B35/62655C04B2235/3206C04B2235/3217C04B2235/3222C04B2235/3251C04B2235/3418C04B2235/3463C04B2235/401C04B2235/402C04B2235/404C04B2235/5436C04B2235/5454C04B2235/80
Inventor 马丁·施吕特托马斯·维斯特斯特凡·迪克斯
Owner BEGO BREMER GOLDSCHLAGEREI WILH HERBST
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