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2018-08-21
Key points of super low carbon content analyzing by high frequency infrared carbon sulfur analyzer are as follows: Contamination prevention. 1.1 Especially oil contamination during process of drilling, turning or milling should be avoided, for which will cause high carbon content in sample, also large result fluctuation. Furthermore, the contaminant is hard to be washed by acetone, ethyl ether, CT...
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2018-07-09
Generally, Al2O3 ceramic means ceramic that with α-Al2O3 as the main crystalline phase, and content of Al2O3 is between 75%~99.9%. Customarily, as a commodity, Al2O3 is named according to the nominal content, for instance, #99 ceramic means nominal content of Al2O3 is 99%, and #95 ceramic means nominal content of Al2O3 is 95%. For ceramic that Al2O3 content is higher than 85%, it’s called high alu...
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2018-08-22
Heat densification methods includes: hot pressing, hot isostatic pressing, etc. As a matter of fact, hot squeezing and hot casting also belong to heat densification, but they are not widely used in ceramic production. Heat densification has high cost, but production rate is low, but for ceramics that need high performance while hard to get sintered, this method is the most widely used, because whe...
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2018-06-27
For most special ceramics, it’s hard to get densified product by only solid phase diffusion, so some certain additive will be added to generate glass phase or liquid phase. Due to rearrangement of particles and viscous flow in liquid phase, densified product can be obtained, meanwhile decrease sintering temperature. If liquid phase exists in the whole process of sintering, then it’s called liquid ...
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2018-08-22
Ordinary solid phase sintering In the past, ceramics were usually sintered in heavy oil tunnel kiln, while nowadays mainly in electric furnace, including tube furnace, vertical type furnace, box type furnace, etc. And sintering environment is decided by the performance requirement of product, also by economic factor. Shielding gas can be used, such as hydrogen, argon, nitrogen, also can be sintere...
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2018-06-20
Virtually, the process of sintering is powder grains are heated in appropriate condition, after a series of physical and chemical changes, and qualitative changes generated between powder particles, strength and density of the blank increase rapidly, other physical and chemical performance also improve obviously. Pressed blanked is not usable directly, so sintering is one of the necessary processe...
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2018-06-11
Cold isostatic pressing, also called isostatic pressure, compared with rigid module pressing, its advantages are as follows: 1.Available to press concave, hollow, slender and other complex shaped product. 2.Friction loss is small, and pressure is low. 3.Pressure is transmitted from every direction, and density distribution of pressed blank is uniform, also with high strength. 4.Module cost is low....
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2018-06-07
Purpose of forming is to produce semi-finished product with certain shape by powder, and the methods are as follows: 1.Direct powder forming, or called powder pressing, such as rigid module pressing, ramming forming, cold isostatic pressing, dry bag isostatic pressing, etc. 2.Plastic lump material forming, also called plastic forming simply, such as plastic blank pressing, roll forming, etc. ...
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2018-06-04
According the content, alumina ceramics are classified by #75, #85, #92, #95 and #99 ceramic, also with some more detailed categories. At present, #95 ceramic has the largest production, and it is most widely used in the market. With high hardness and abrasive resistance, and small dielectric loss, its performance can fulfill most of the industry technical requirements, which is much better than #...
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