ChineseEnglishWelcome to visit yx xing jinggang ceramic technology co., LTD.

yx xing jinggang ceramic technology co., LTD.

Vowedinto the industrial ceramic industry benchmarking enterprises

158 6152 1178

0510-83829018

keywords: Alumina ceramic      Zirconia ceramics

hotline

0510-83829018

Manufacturing technology of alumina wear-resistant ceramics

Return Release date: 2020/2/28 13:57:46

At present, it can be divided into high-purity type and common type. The ceramic material with Al2O3 content of more than 99.9% in high-purity alumina ceramic system of wear-resistant plate is generally made into molten glass to replace platinum crucible due to its sintering temperature of 1650-1990 ℃ and transmission wavelength of 1-6 μ M. it can be used as sodium lamp tube by its light transmittance and alkali resistant metal corrosion resistance; it can be used as integrated circuit substrate and high-frequency insulating material in electronic industry.

 

According to the content of Al2O3, ordinary alumina ceramics can be divided into 99, 95, 90 and 85 ceramics. Sometimes, alumina ceramics with Al2O3 content of 80% or 75% can also be classified as ordinary alumina ceramics. Among them, 99 alumina ceramic materials are used to make high temperature crucible, fire-resistant furnace tube and special wear-resistant materials, such as ceramic bearing, ceramic seal and water valve plate, etc.; 95 alumina ceramic is mainly used as corrosion-resistant and wear-resistant parts; 85 ceramics can be sealed with molybdenum, niobium, tantalum and other metals, and some of them can be used as electric vacuum devices. The manufacturing process is as follows:

 

Powder preparation
      According to different product requirements and forming processes, the aluminum oxide powder is prepared into powder materials. The particle size of the powder is less than 1 μ m μ M. if the high purity alumina ceramic products are manufactured, the purity of alumina is 99.99%, and the ultrafine grinding is needed to make the particle size distribution uniform. When the wear-resistant plate is extruded or injection molded, the binder and plasticizer shall be introduced into the powder, generally the thermoplastic plastic or resin with the weight ratio of 10-30%. The organic binder and alumina powder shall be evenly mixed at the temperature of 150-200 ℃ to facilitate the molding operation.

       The raw materials of powder formed by hot pressing process need not be added with binder. If semi-automatic or automatic dry pressing is used, there is a special technological requirement for the powder. Spray granulation is needed to treat the powder and make it appear round spherical, so as to improve the fluidity of the powder and facilitate the automatic filling of the mould wall. In addition, in order to reduce the friction between powder and die wall, 1-2% lubricant, such as stearic acid and PVA binder, should be added. For dry pressing, powder granulation is needed, and polyvinyl alcohol is used as binder.

国产91大片精品一区在线观看,99热门精品一区二区三区无码,国产精品三级高清在线,国产精品欧美福利久久 国产特黄A级三级三级视频 www天堂网亚洲 大香伊蕉在人线国产av 91久久人妻精品中文无码 亚洲一区图片小说 免费A∨中文高清乱码专区资讯 国产在线观看午夜福利片 国产精品分类视频分类一区 浪潮AV色综合久久国产 Powered by ZZZcms