WANG Changlin

Abstract: In increasing the density of refractory products and reducing the porosity, scholars at home and abroad have done a lot of work, and respectively came to the conclusion that they play a major role in production. However, until now, there has not been a simple calculation formula that can be calculated based on certain conditions of the semi-finished product to control the porosity of the product. Although some scholars have obtained the expression of the relationship between the molding pressure and the porosity, it only indicates that the semi-finished product The porosity is directly proportional to the molding pressure, and the relationship between it and the porosity of the finished product is not pointed out. Due to the influence of process factors, it is difficult to obtain an accurate expression for the relationship between the porosity of the finished product and the porosity of the semi-finished product. Because of this, in order to determine or improve the porosity index of the product in production, the first thing to do is to do a big sting test to determine The molding pressure and the proportional coefficient are used to calculate in advance to judge whether the porosity of the final product meets the index requirements in time. This is time-consuming and unreliable, and therefore, it is inconvenient to control the production technology.

    According to the data, there are many factors that affect the porosity of products, and it is more difficult to summarize these factors in a calculation formula. However, it should be pointed out that a product with a certain porosity must have a certain volume density; the factors that affect the porosity are also factors that affect the volume density. For refractory products with stricter external dimensions, the volume density of the finished product is mainly determined by whether the volume density of the semi-finished product reaches a certain value, and the volume density of the semi-finished product is easy to obtain. Therefore, a calculation formula suitable for production technology control can be derived.

Keywords: Refractory products, pores, bulk density