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Frequently Asked Questions About Zirconia Ceramic Sintering

Frequently Asked Questions About Zirconia Ceramic Sintering

The final process of zirconia ceramic body forming is sintering, and the performance of the produced ceramic products is largely determined by sintering. During the sintering process, the zirconia ceramic body may be deformed, cracked, and abnormally grown in grains. What are the causes of these problems? Pintejin Ceramics is a professional zirconia ceramic machining enterprise. Advanced production equipment, advanced machining technology, high-quality products are welcomed by the majority of users. Pintejin Ceramic Machining email: [email protected]. Below we will specifically analyze the common problems of zirconia ceramic sintering.

The ceramic green body is composed of many solid particles before sintering, and the green body has many pores, and the density is usually 35%~60%, which determines the characteristics of the powder itself and the molding method and technology to be used. . The sintering process is divided into: conventional sintering is processed in a traditional electric furnace, which is the most frequently used sintering method for advanced ceramic machining; hot pressing sintering uses a special hot press for machining, unidirectional or bidirectional at high temperature Pressing production; hot isostatic pressing sintering through argon and other inert gases for pressure transfer medium, placing the product in a closed container, sintering under the action of suitable temperature and pressure; while microwave heating and conventional heating modes The difference is that the dielectric loss of the ceramic material in the microwave electromagnetic field reaches the sintering temperature for sintering and densification.

When zirconia ceramics are deformed during sintering, it may be because the particle size distribution of the powder is too wide; the selection and use of additives in the powder are not suitable to cause the ceramic shrinkage to be inconsistent. There are generally three reasons for the inconsistent shrinkage of ceramics: the furnace temperature is uneven; the heating rate is too fast, and the temperature conduction produces a gradient. The closer the ceramic body is to the surface, the faster the shrinkage, and the slower the center shrinkage. There is a density gradient. During molding, the internal shrinkage of the blank is inconsistent due to pressure or filler.
The reason for the cracking of the ceramic body after sintering is usually the internal defects of the ceramic body, and at the same time, it is also related to the shrinkage of the body. When the ceramic shrinkage is inconsistent, if there are still defects, these defects will become the source of cracks, and the cracked lines will continue to crack, causing the green body to crack.

If the grains start to grow abnormally, these large grain pores are difficult to discharge, and it is difficult to achieve high density of the ceramic material. The reasons for the abnormal growth of grains are: the particle size of the original powder is too large; the density of the green body is uneven during molding; the sintering temperature is too high and the holding time is too long.

Usually, the sintering process includes conventional sintering, hot pressing sintering, hot isostatic pressing sintering, microwave sintering and other methods. When there is a problem with our ceramic products, we can analyze and investigate according to the content of the article. If you have any questions or suggestions, please contact us. Pintejin Ceramics specializes in the production and precision machining of a wide variety of precision ceramics, and high-quality products are used in a wide range of applications. We wholeheartedly provide customers with ceramic workpiece products with good performance, create useful and powerful value for customers, and continue to develop and progress to become a trusted partner of customers to create a win-win situation.

About China Advanced Ceramic CNC Machining Company – Be-Cu

China Ceramic Machine Shop

Manufacturer of precision machined components. Ceramic cnc machining components include high dielectric strength, electrical & corrosion resistance, & non-porous & non-shrinking properties.Manufacturer of high temperature fabricated and machinable ceramics including alumina, glass-ceramic, alumino-silicate, boron nitride and zirconium phosphate. Adhesives, coatings and potting compounds to 3200 degrees F,Air firing services for ceramics up to 1650 degrees C also available. Products include insulators, guides, washers, tubes, blocks, & rods for thermal, electrical, corrosion exposure, structural, wear, & semi-conductor operations. Services include machining to tolerances of +/- .0001, ultrasonic core drilling, centerless grinding, milling, & ID & OD threading.Surface grinding, dicing, OD (outer dia.) grinding, ID (inner dia.) grinding, centerless grinding, hole drilling, jig grinding, lapping, honing & polishing service are also available. Diamond grinding with dimensional tolerances of 5 microns & surface finishes of 0.2 microns (8 micro-in.) can be performed.Blanket orders and AutoCAD files & other 3d files accepted.Contact us for your machining ceramic project!