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Method for preparing oriented porous silicon nitride ceramics based on gelatin solution freeze-drying technology

A technology of silicon nitride ceramics and gelatin solution, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of preparation failure, low solid phase content, green body collapse, etc., and achieves good hole connectivity and porosity. High, easy-to-control effects

Active Publication Date: 2015-09-23
西安晶科立芯半导体设备有限公司
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Problems solved by technology

However, when the traditional distilled water-based experimental method has a l

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  • Method for preparing oriented porous silicon nitride ceramics based on gelatin solution freeze-drying technology
  • Method for preparing oriented porous silicon nitride ceramics based on gelatin solution freeze-drying technology
  • Method for preparing oriented porous silicon nitride ceramics based on gelatin solution freeze-drying technology

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] 1) One-dimensional oriented porous silicon nitride ceramics, the composition of which is shown in Table 1. In Examples 1 to 10 shown in Table 1, silicon nitride, yttrium oxide and aluminum oxide are mixed according to the proportions in Table 1. Put it into a ball mill tank, use absolute ethanol as the ball milling medium, and use agate balls to mill on a planetary ball mill for 5 hours, then take it out and put it in a drying oven at 80°C for drying, and the dried mixture will pass through a 14-mesh sieve to form a powder ;

[0021] 2) According to the ratio in Table 1, the gelatin was formulated into a gelatin solution and mixed evenly with the powder to form a homogeneous system, and placed in a vacuum box for vacuum defoaming;

[0022] 3) Place the defoamed homogeneous system in a refrigerator at 7°C for 2 hours to refrigerate the system to gel and obtain a...

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Abstract

The invention discloses a method for preparing oriented porous silicon nitride ceramics based on a gelatin solution freeze-drying technology. Silicon nitride powder mixed with a sintering addition agent, and a gelatin solution at certain concentration are mixed to form a uniform system, then vacuum bubble removing is carried out, and the mixture is cooled under the temperature of 1-20 DEG C to be promoted to be gelatinized to obtain colloid; the colloid is frozen at the temperature of minus 90-minus 10 DEG C, low-temperature vacuum drying is carried out to obtain a green body, the green body is sintered under the nitrogen atmosphere after gelatin discharging is carried out, and finally the oriented porous silicon nitride ceramics is obtained. According to the method for preparing the oriented porous silicon nitride ceramics based on the gelatin solution freeze-drying technology, the features that a gelcasting blank is high in strength and by means of a freeze-drying method, hole gaps are evenly distributed, the orientation degree is superior, and the hole communication performance is good are combined, and the gelatin superior in the water storage capability is used for being prepared into the gelatin solution to be mixed with the silicon nitride powder to prepare the oriented porous silicon nitride ceramics for the first time.

Description

technical field [0001] The invention relates to the preparation of one-dimensional oriented porous silicon nitride ceramics, in particular to a method for preparing oriented porous silicon nitride ceramics based on gelatin solution freeze-drying technology. Background technique [0002] Oriented porous ceramics have attracted more and more attention as ceramic filters because of their good fluid permeability and mechanical properties. Porous silicon nitride ceramics with high-strength fibrous grains and excellent fracture toughness is a new and most promising filter material. Common methods for preparing oriented porous ceramics include anodic oxidation, template replication, adding pore-forming agents, freeze-drying, and fiber winding. The preparation of oriented ceramics based on freeze-drying of distilled water has attracted attention because of its excellent degree of orientation, relatively simple process, and excellent connectivity of the prepared samples. However, w...

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Application Information

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IPC IPC(8): C04B38/00C04B35/584
Inventor 于方丽白宇倪澍韩朋德管浩张霞
Owner 西安晶科立芯半导体设备有限公司
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