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Method for extruding tubular ceramic products by virtue of composite thermoplastic medium

A ceramic product and thermoplastic technology, which is applied in the field of forming tubular ceramic products, can solve problems such as difficult to form blind tubes, production efficiency and product quality cannot be guaranteed at the same time, and achieve the effect of production efficiency and product quality assurance

Inactive Publication Date: 2010-02-24
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Production efficiency and product quality cannot be guaranteed at the same time, it is difficult to form blind tubes, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0037] To prepare YSZ dense electrolyte blind tube, the steps are as follows:

[0038] Mix YSZ powder, paraffin, stearic acid, and Span 40 in distilled gasoline and stir to dissolve until the gasoline is completely volatilized. Wherein the additions of paraffin, stearic acid, Span 40 and distilled gasoline are respectively 18%, 2%, 0.5%, 33% of the solid powder weight.

[0039] Stir at 80°C for 2 hours with a twin-roller mixer, then add polyethylene after heating up to 160°C, then cool down to 80°C, and stir for 6 hours to obtain mud. Certain solvents and binders will evaporate during this process. Wherein the addition of polyethylene is 10% of solid powder weight.

[0040] Put the mud in a vacuum drying oven at 120°C for 24 hours, and then cut it into pieces for later use.

[0041] The mud is refined twice at 130°C in a screw extruder to make it more uniform.

[0042] Add a suitable mold head, control the speed, extrude the ceramic tube on the stainless steel tube shaft u...

specific Embodiment 2

[0048] Preparation of YSZ / NiO porous anode support blind tube, including:

[0049] Carbon powder is used as a pore-forming agent, and the weight ratio of raw materials is YSZ:NiO:C=1:1:0.3.

[0050] The remaining process methods and steps before sintering are the same as those in Embodiment 1.

[0051]Pre-fire according to a certain degumming and carbon discharge system, and pre-fire the tube billet at 950°C to obtain a porous anode-supported blind tube. The tube size is: outer diameter φ20mm, length 400mm, wall thickness 2mm; porosity 30%. It has good straightness and roundness, uniform wall thickness, certain self-supporting strength, basically no shrinkage of the tube blank, and meets the requirements of the anode support tube.

specific Embodiment 3

[0052] Prepare YSZ / LSM porous cathode support blind tube, the tube size is: outer diameter φ20mm, length 600mm, wall thickness 2mm, porosity 30%, including:

[0053] Carbon powder is used as a pore-forming agent, and the weight ratio of raw materials is YSZ:LSM:C=1:1:0.3.

[0054] The calcining temperature is 900° C., and the remaining process methods and steps are the same as those in the second embodiment.

[0055] The obtained cathode-supported blind tube has the following dimensions: an outer diameter of φ20mm, a length of 600mm, a wall thickness of 2mm, and a porosity of 30%. It has good straightness and roundness, uniform wall thickness, certain self-supporting strength, basically no shrinkage of the tube blank, and meets the requirements of the anode support tube.

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Abstract

The invention discloses a method for extruding tubular ceramic products by virtue of composite thermoplastic medium; low-temperature binders, plasticiser, lubricating agents, surface active agents andsolvent are pre-mixed, and the mixture is melted down by heating, and is stirred uniformly; ceramic powder material is added in the mixture by one to four times, and the mixture is stirred uniformlyuntil the solvent is completely volatilized, the mixture is stirred at the temperature of 70-90 DEG C for 1-10 hours, and high-temperature binders are added in after the temperature in raised to 140-170 DEG C, and then the temperature is reduced to 70-90 DEG C, and the mixture is stirred for 2-10 hours to form ceramic mud; and then the ceramic mud is decayed for 12-48 hours at the temperature of 100-130 DEG C in a vacuum drying chamber, the ceramic mud is refined and carries out tube extrusion, so as to form a tube blank; the tube blank is soaked with the solvent for 12-48 hours at the normaltemperature, or is bathed by constant-temperature water for 2-12 hours at the temperature of 40-90 DEG C, the dried tube blank carries out rubber discharge and is sintered into a ceramic body. The method is suitable for preparing branch tubes with long and thin walls or blind tubes, and the production efficiency and product quality can be ensured at the same time.

Description

technical field [0001] The invention relates to a molding technology of tubular ceramic products, in particular to a method for extruding tubular ceramic products by means of a composite thermoplastic medium. Background technique [0002] Tubular ceramic products are widely used in industry, such as tubular electronic components, tubular heaters, thermocouple protection sleeves, tubular solid oxide fuel cells, tubular oxygen permeable membranes, etc., all of which use slender ceramic tubes . [0003] The molding techniques of the elongated ceramic tubes in the prior art mainly contain the following types: [0004] Grouting molding, extrusion molding, isostatic pressing after extrusion, etc. These three tubular ceramic molding technologies are relatively mature technologies in the existing technology, and all have their own unique advantages. [0005] There are at least the following disadvantages in the above-mentioned prior art: [0006] Production efficiency and product...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/632B28C1/16B28C1/22B28B3/22B28B11/00B28B11/24F16L9/10H01M8/10H01M8/1246
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 韩敏芳朱佩誉邓湘凌李福燊于立安丁伟中
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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