refractory silicon nitride ceramic sleeve bush

refractory silicon nitride ceramic sleeve bush

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Silicon Nitride Ceramic:

The normal-pressure sintered silicon nitride is prepared by mixing a high-purity, ultra-fine, high-α content silicon nitride powder with a small amount of a sintering aid, and forming it by a process such as forming and sintering. During the sintering process, the α phase dissolves into the liquid phase, and then precipitates on the β-Si3N4 nucleus to become β-Si3N4, which is advantageous for the sintering process. Nitrogen must be introduced during sintering to suppress the pyrolysis of Si3N4. At normal pressure sintering, a ceramic having a complicated shape and excellent performance can be obtained, and the disadvantage is that the sintering shrinkage rate is large, generally 16% to 26%, which easily causes cracking and deformation of the product. The reaction-sintered Si3N4 sintered compact is placed in a silicon nitride powder in the presence of a sintering aid, and is re-sintered at a high temperature to obtain a dense Si3N4 product. The sintering aid can be introduced during the ball milling of the silicon powder, or can be impregnated by the impregnation method after the reaction sintering. Since the process can be pre-processed during the reaction sintering process, the shrinkage during the re-sintering process is only 6% to 10%, so that a component having a complicated shape and excellent performance can be prepared.

properties:

High hardness, high strength, wear resistance, corrosion resistance, high temperature(1200°), good thermal diffusivity, good thermal shock resistance(avoid the temperature changing rapidly), good insulativity, low density. The comprehensive properties are best in most of structure ceramic.

Data Sheet↓

Application industry:

Machinery, electronic, semiconductor, chemical, petroleum, smelt.

Specific application:

Welding shaft, electronic substrate, plunger, nozzle, slide guide, diesel parts, metal molding, shaft wheels etc.

7.MOQ is not limited, small quantity is welcome.

8.Vigorous team and good after-sales service

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FAQ

Q: Are you trading company or manufacturer ?
A: We are factory.
 
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A: Generally it is 5-10 days if the goods are in stock. or it is 15-30 days if the goods are not in stock, it is according to quantity.
 
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A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
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A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.