Development of dense products for glass fiber tank kiln. In order to obtain excellent Cr2O3 products, a number of process factors and additives were used to study the effects of the additives on the properties and sinterability of the products. Then, the process is optimized to obtain technical indicators that meet or exceed the products of similar foreign products, and the technical indicators of the developed products and similar products introduced are listed in the list. It can be seen that the compact Cr2O3 products developed by Luo Naiyuan are superior to the United States and German brand products except that the chemical composition Cr2O3 is equivalent to the imported products from abroad. This difference in performance may be caused by the differences in the particular process technology used and the mechanism by which the additives are introduced.
Luo Ningyuan's product indicators are all tested by the National Refractory Materials Quality Inspection Center; the data in the brackets in the table are the actual measured values ​​of the National Refractory Material Quality Inspection Center. Raw material purity Purity raw material purity is the basic condition for preparing high-quality refractory materials. It not only affects the physical properties of the product, but also greatly enhances the product's use characteristics. Cr2O3 is a neutral material with unique anti-alkali and acidity properties and is an ideal raw material for the production of high-grade refractory materials. In some of the industrial furnaces (such as coal-water slurry gasification furnaces, non-ferrous metal smelting furnaces, and alkali-free or low-alkali fiberglass tanks, etc.) in high erosion areas, it seems impossible to replace them with other materials. For this reason, dense Cr2O3 materials are commonly used in the damaged areas of alkali-free or low-alkali glass fiber tank kilns at home and abroad, and the content of Cr2O3 is developing towards high purity. Therefore, this study has always adhered to the purpose of developing products with a Cr2O3 content of over 94% and useful components of 98% or more.
The tool for hole processing is the earliest tool used in cutting tools, and it is also the most widely used tool. The objects of hole processing are various holes on the machine or instrument, such as the inner hole of the gear, the shaft hole on the box, and the porridge. Taper holes, etc. According to different uses and technical requirements, the tools for hole processing are divided into: drills, boring cutters, reamers, etc.
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