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Special die for long bar ceramic blank bottom-pouring liquid lifting gel casting and preparation method for producing long bar ceramic by using same

A ceramic green body and long rod technology, which is applied in the field of special molds for inorganic non-metallic materials and their preparation, can solve problems such as pore defects, scrapping, and gas cannot be discharged, and achieve high production efficiency, high quality, and simplified processes.

Active Publication Date: 2013-01-23
SHANDONG ULSTREETCARING FINE CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the gas in the mold cavity hole is easily blocked by the slurry and cannot be discharged when the slurry is poured into a slender rod-shaped ceramic body, and the problem that the air hole defect is left in the body and is scrapped, and provides a method for each molding Multi-piece products, improving production efficiency, meeting the requirements of industrial production, a special mold for down-injection type rising liquid injection and solidification molding of a long rod-shaped ceramic body and a preparation method for producing long rod-shaped ceramics by using the mold

Method used

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  • Special die for long bar ceramic blank bottom-pouring liquid lifting gel casting and preparation method for producing long bar ceramic by using same
  • Special die for long bar ceramic blank bottom-pouring liquid lifting gel casting and preparation method for producing long bar ceramic by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Preparation of 99% alumina ceramic square billet

[0031] Assembly mold

[0032] Such as figure 1 , figure 2 As shown: First, the slurry cylinder 2 is inserted into the base 1 through the groove to form a female mold for the slurry with a lower seal, and then the 12-layer half-hole template 4 is combined and inserted into the fastening ring 3 to become a fixed There are 47 male molds with 10mm×10mm×420mm square holes, put the male mold into the female mold, and install the lower end on the support step of the slurry cylinder 2, insert the long-handled funnel 5 in the pouring hole 6; The internal taper of the fastening ring 3 is 5°, and the external conicity of the composite formed by the template 4 with 12 layers of half holes is the same as the internal taper of the fastening ring 3 .

[0033] Production Method

[0034] Weigh 2200ml of the prepared gelatable 99% alumina ceramic slurry, slowly pour the slurry into the long-handled funnel 5, the slurry...

Embodiment 2

[0035] Example 2: Preparation of silicon carbide ceramic slender rod green body

[0036] Assembly mold

[0037] Formwork 4 with half-holes is 20 layers. After combination, there are 128 round holes of Φ3mm×230mm. The taper of fastening ring 3 is 10°. The internal taper is identical, and others are with embodiment 1.

[0038] Production Method

[0039] Weigh 230ml of gelatable SiC ceramic slurry, slowly pour the slurry into the long-handled funnel 5, the slurry flows into the bottom of the mold along the pouring hole, and then the rising liquid fills each round hole in the mold, then pull out the long-handled funnel 5, Insert in the casting hole 6 with a metal round rod. After the slurry gel is solidified, first withdraw from the base 1, then open the slurry cylinder 2, cut off the bottom 3mm thick gel body with a blade, and eject the 20-layer formwork 4 with half holes from the fastening ring 3 as a whole. Then peel off the templates of each layer one by one to obtain 128 ...

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Abstract

The invention relates to a special die for long bar ceramic blank bottom-pouring liquid lifting casting formation and a preparation method for producing long bar ceramic by using the same. The die is characterized by consisting of an integrated circular base, a slurry barrel, an integrated fastening ring, a multilayer half-hole template assembly and a long stem funnel, wherein the integrated circular base is provided with a groove; the lower part of the slurry barrel is provided with a circle of supporting step, and the slurry barrel consists of two semicircles; the outside diameter of the integrated fastening ring is in dynamic fit with the inside diameter of the slurry barrel, and the interior of the integrated fastening ring has taper; and the external circle taper of the multilayer half-hole template assembly is as same as the inner taper of the fastening ring, and the middle part of the multilayer half-hole template assembly is provided with a casting hole. The method is characterized by comprising the following steps of: 1) preparing slurry; 2) assembling the die; 3) casting with a bottom-pouring liquid lifting method; 4) curing gel, and stripping; and 5) dehydrating, dryingand sintering. The die does not need to be moved in the slurry casting operation, difficulty is not caused when the die is heavy, the slurry is easily lifted stably, and bubbles are not introduced; and by using the method, efficient batch production of long bar ceramic shaft blanks can be realized.

Description

technical field [0001] The invention belongs to the field of special molds for inorganic non-metallic materials and a preparation method thereof, and in particular relates to a special mold for down-injection-type rising-liquid injection and coagulation molding of a long rod-shaped ceramic body and a preparation method for producing long rod-shaped ceramics by using the mold. Background technique [0002] For the slender rod-shaped ceramic body, the commonly used production methods are mainly plastic mud extrusion method and wax slurry hot die casting method. When the size is large, cold isostatic pressing method can also be used. [0003] The mud extrusion method has a high degree of mechanization and is more suitable for large-scale production. As long as the nozzle diameter of the mud extrusion machine and the length of the cutting section are well controlled, a ceramic body with good dimensional consistency can be obtained. The key technology is to mix the mud with high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B7/16B28B13/04B28B1/14
Inventor 陈大明常虹
Owner SHANDONG ULSTREETCARING FINE CERAMICS
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