Solid-phase sintered silicon carbide product and preparation method thereof

A solid-phase sintering, silicon carbide technology, applied in the field of engineering ceramic materials, can solve the problems of difficult automatic production, increased production cost, low production efficiency, etc., and achieves the effects of low cost, reduced processing cost, and high production efficiency

Active Publication Date: 2021-12-24
NANTONG SANZER PRECISION CERAMICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain high-performance silicon carbide products, another related technology will undergo isostatic pressing after mixing, aging, extrusion molding, and drying, and then sinter at high temperature. However, the cost of isostatic pressing equipment is high. , it is not easy to automate production, and the production efficiency is low. After adding isostatic pressing, it will lead to a further increase in production cost

Method used

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  • Solid-phase sintered silicon carbide product and preparation method thereof
  • Solid-phase sintered silicon carbide product and preparation method thereof
  • Solid-phase sintered silicon carbide product and preparation method thereof

Examples

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preparation example Construction

[0053] A method for preparing a solid-phase sintered silicon carbide product, comprising the steps of:

[0054] S1. Ingredients: use micron-sized silicon carbide powder with a particle size of 3-10 μm as the main raw material, boron-containing sintering aids with a particle size of 3-10 μm and water-soluble carbon black as solid-phase sintering aids; binder , plasticizer and lubricant as functional additives; wherein, the amount of boron-containing sintering aid is 0.2-0.5wt% of the weight of micron-sized silicon carbide powder, and the amount of water-soluble carbon black is 0.5% of the weight of micron-sized silicon carbide powder. -3wt%; the amount of the binder is 0.5-2wt% of the weight of the micron silicon carbide powder; the plasticizer consists of a high molecular weight plasticizer with a molecular weight of 150,000-200,000 and a low molecular weight plasticizer with a molecular weight of 4000-6000 Composition, the weight ratio of high molecular weight plasticizer and...

Embodiment 1-8

[0073] The consumption of each raw material in embodiment 1-8 is shown in table 1. As shown in Table 1, the main difference of Examples 1-8 is that the proportioning ratio of raw materials is different.

Embodiment 1

[0075] The preparation method of the silicon carbide product provided in Example 1 is as follows:

[0076] S1. Grinding of raw materials: put 100kg of micron-sized silicon carbide powder and 0.3kg of boron carbide powder into a vertical grinder, and grind them with water as a solvent to obtain a slurry with a particle size of 0.4-0.8μm and a solid content of 45wt%. material;

[0077] S2. Spray granulation: add 1 kg of water-soluble carbon black and 1 kg of binder to the slurry of S1, stir evenly, adopt centrifugal spray granulation, the inlet temperature is 225°C, and the outlet temperature is 98°C to obtain silicon carbide Granulated powder;

[0078] S3. Mixing: Take 100kg of silicon carbide granulated powder prepared by S2, add it to the mixer, then add 4kg of plasticizer, start the mixer, mix the two evenly, then add 20kg of deionized water and 1.5 kg lubricant, stirred evenly to obtain wet powder;

[0079] S4. Stale: put the wet powder under the condition of temperature...

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Abstract

The invention relates to the field of engineering ceramic materials, and particularly discloses a solid-phase sintered silicon carbide product and a preparation method thereof. The preparation method of the solid-phase sintered silicon carbide product comprises the following steps: grinding raw materials: mixing micron-sized silicon carbide powder with a boron-containing sintering aid, and performing wet grinding to obtain slurry; performing spray granulation: adding water-soluble carbon black and a binder into the slurry, uniformly stirring, and carrying out spray granulation to obtain silicon carbide granulation powder; mixing the materials; aging: aging the wet powder obtained by mixing to obtain an aged material; and performing post-treatment: performing pugging, extrusion, drying and heat treatment on the aged material. The silicon carbide product prepared by the preparation method can be used as a heat exchange tube, a roller rod, a square beam, a micro reaction tube and the like, and has the advantages of high sintering density, high compressive strength and high toughness; in addition, the preparation method has the advantages of low production cost and high production efficiency.

Description

technical field [0001] The application relates to the field of engineering ceramic materials, more specifically, it relates to a solid-phase sintered silicon carbide product and a preparation method thereof. Background technique [0002] Engineering ceramics refers to the general term of various ceramics used in the field of engineering technology, including structural ceramics, functional ceramics and ceramic matrix composites. In recent years, with the advancement of science and technology and the development of industry, engineering materials have become a research hotspot in the field of materials due to their high temperature resistance, chemical corrosion resistance, wear resistance, oxidation resistance and other performance characteristics. The currently widely used engineering ceramics mainly include alumina ceramics, silicon carbide ceramics, silicon nitride ceramics, and zirconia ceramics. [0003] Among them, silicon carbide ceramics have excellent high-temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/64
CPCC04B35/565C04B35/622C04B35/64C04B2235/424C04B2235/606C04B2235/6562C04B2235/6567C04B2235/3821C04B2235/77C04B2235/95C04B2235/96
Inventor 闫永杰赵瑞康
Owner NANTONG SANZER PRECISION CERAMICS CO LTD
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