Mold and method for extruding closed-end ceramic tube

Abstract

The invention discloses an extrusion forming die of ceramic pipes with closed ends. The extrusion forming die is arranged at the extrusion end of an extrusion machine and comprises an outer die body (5), a die core (4) and an end socket (3). The outer die body (5) is a vertically-through cavity. The die core (4) is arranged in the outer die body (5). The lower end of the outer die body (5) is fixed to the extrusion end of the extrusion machine. A gap is reserved between the outer die body (5) and the die core (4) to form an extrusion channel. The top end of the outer die body (5) is sealed through the end socket (3).

Description

Technical field [0001] The invention relates to a mold, in particular to a mold and a method for extruding a closed-end ceramic tube. Background technique [0002] With the development of economy, the efficient use of energy has received more and more attention from the country. Solid oxide fuel cells (SOFC), due to the high power generation efficiency, can directly convert chemical energy into electrical energy without being restricted by the Carnot cycle. The efficiency can reach 80%. It can use hydrogen, methane, natural gas and other fuels. It has low noise and low emissions. It can be used in residential areas, mines, hospitals and other small areas as well as warships and moving targets. It has great development prospects in the future , And the yttrium-stabilized zirconia ceramic tube with one end closed is a core element of SOFC. It is of great significance to mass-produce stable yttrium-stabilized zirconia ceramic tubes with one end closed; [0003] Ceramic tubes with one...

AI Technical Summary

Problems solved by technology

The grouting molding process is very mature. The grouting molding requires that the slurry must be high-solid and low-viscosity. At the same time, the quality of the grouting personnel directly affects the quality of the finished product during grouting. Human factors have a great influence, and the general grouting molding process is cumbersome. , The production cycle is long. At present, most of the ceramic tubes with one end closed in batches use this process, such as reaction sintering and recrystallization sintering thermocouple protection tubes. Since the plaster mold absorbs the moisture in the slurry from the outside to the inside, the green body will have a density gradient. The uniformity of the structure is not good; hot die casting and isostatic pressing are suitable for the production of large-scale products, and the investment in production equipment is large, and the production efficiency is low; extrusion molding of ceramic tubes with one end closed can produce a series of sizes and densities Uniform and straight pipes have been well used in many fields at home and abroad, but there are few technical introductions about extrusion molding dies for one-end closed ceramic pipes

[0005] U.S. Patent CN1283541A report, the method and mold of extruding ceramic pipe end cap, the end cap forming mold has a body, the body is connected with the extruding mold, and an anti-filling container is arranged in the body to receive the cavity from the end cap. For the ceramic material, a plunger goes deep into the backfill container to force the ceramic slurry from the backfill container through the channel back to the end cap to form a cavity to be compacted so that it has a uniform density, but the mold is not extruded from the front end. describe

[0006] Chinese patent CN103739289A reported an extrusion mold for extruding a silicon carbide thermocouple protection tube, which is mainly composed of an extrusion core, a connecting piece, an outer mold sleeve, and a sealing piece. Describe the mold structure and how to use it

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