Method for detecting content of ferric oxide in silicon carbide

Abstract

The invention discloses a method for detecting the content of ferric oxide in silicon carbide. The method comprises the following steps: A, preparing a to-be-detected solution; and B, building a standard working curve by a ferric standard solution, testing the to-be-detected solution obtained in the step A to obtain the concentration of ferric ions in a filtrate, and calculating to obtain the content of Fe2O3 in the silicon carbide. The method for detecting the content of the ferric oxide in the silicon carbide is different from a conventional silicon carbide sample melting method and a method for detecting Fe2O3 in the silicon carbide by virtue of an inductively coupled plasma emission spectrometer (ICP-OES); hydrochloric acid, HF acid and ammonia water do not need to be used for treating samples in the early stage; a platinum vessel does not need to be used for preparing the samples; the sample preparing time is greatly reduced; the acid damage and the risk that a platinum crucible is carbonized and reduced can be avoided; the environmental pollution damage is greatly reduced; in addition, high-purity SiO2 auxiliary products are obtained; the value of the method for detecting the content of the ferric oxide in the silicon carbide is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis of refractory materials, and relates to a method for detecting Fe in silicon carbide 2 o 3 content method. Background technique [0002] Silicon carbide (silicon carbide) is commonly known as emery. Pure silicon carbide is a colorless and transparent crystal. The crystal structure of silicon carbide is divided into hexagonal or rhombohedral α-SiC and cubic β-SiC (called cubic silicon carbide). α-SiC has many different variants due to the different stacking sequences of carbon and silicon atoms in its crystal structure, and more than 70 species have been discovered. β-SiC transforms into α-SiC above 2100°C. Due to its stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance, it is often used as a high-grade refractory material in addition to being used as an abrasive. It is resistant to thermal shock, small in size, light in...

AI Technical Summary

Problems solved by technology

For the method, refer to the sample preparation method in section 8.3 of GBT 3045-2003 "Chemical Analysis Methods for Ordinary Abrasive Silicon Carbide". Put 1 g of the sample in a platinum dish, add nitric acid, sulfuric acid, and HF acid, evaporate to dryness on a sand bath, and then add hydrochloric acid. Take the filtrate by hot-melt filtration, and then use the colorimetric method in Section 9 to test Fe 2 o 3 , it is well known that acid is harmful and will pollute the environment, and considering the risk of platinum crucible being carbonized and reduced, this detection method cannot be widely accepted