Silicon carbide refractories quality profile

Abstract: this paper introduces the properties of silicon carbide refractories H&X silicon carbide green, development and application of key words: silicon carbide refractories, properties, development and application of silicon carbide has high fire-resistant performance and chemical stability, so they are widely used in all kinds of refractory, but at present our country there is no complete the different content of the chemical analysis method of silicon carbide refractories. The analysis of the silicon carbide refractories quality projects generally have: free carbon, silica, silicon carbide, free silicon, ferric oxide, alumina. 1. The free carbon analysis free carbon has three methods, namely burning weight method, volumetric method, gas weight method. Burning weight method is applicable only to pure silicon carbide sample, organic and crystallization water and H&X garnet abrasive volatile nature of the refractory materials do not apply this method to determine; Gas volumetric method due to the fast analysis speed, high precision, simple operation, the most commonly used; Gas weight method because the test time is long, the accuracy is not high, not commonly used, but this method can extend the time of sample decomposition, at the same time, the carbon dioxide absorbed dose is larger, so it is suitable for the determination of silicon carbide refractories quality of high carbon refractory. 2. Analysis of silicon carbide silicon carbide has the direct method and indirect method. The indirect method is divided into determination of carbon in silicon carbide to conversion and determination of silicon in silicon carbide to conversion two kinds big. The indirect method to measure silicon low requirement to the instrument, conversion coefficient is small, but the test time is long, complex operation, not easy to master, carbon measurement method is rapid, simple, less interference, wide applicable scope, precision demand is high, but the instrument scaling factor. Commonly used gas volumetric method and weight method and infrared absorption method to measure carbon gases.