The properties of firebrick depend on the composition and distribution of phase and the characteristics of each phase of firebrick, that is, the chemical mineral composition of the products.For a given material, chemical composition of a certain, can adopt the proper process method, has some characteristics of phase organization (such as crystal structure, grain size, distribution and formation of solid solution and glass are equal) and some kind of organizational structure (e.g., the degree of density, particle size and distribution of the material, etc.), to a certain extent by improve the nature of the work product.
1. Chemical composition
Chemical composition is the chemical composition of refractory brick, which is one of the most basic characteristics of refractory products.Firebrick is an inhomogeneous body, which can be divided into main and minor components.The basic component is usually called the primary component, and the other parts are called the secondary components.Secondary ingredients are added intentionally to improve the performance of a certain aspect of the product, or unintentionally or have to bring in the useless or harmful ingredients, respectively called added ingredients and impurities.The principal component is usually one or more of high melting point refractory oxides or complex minerals or non-oxides.It is the main part of refractory products, which directly determines the basic conditions of refractory properties.
Add ingredients is often to make up for the main components in the use of performance or insufficient production of certain aspects of the performance and operation performance and use, often referred to as binder, mineralizing agent, stabilizer, sintering agent and water reducing agent, hydration resistance agent, antioxidant, coagulant, expansion agent, etc., there are many different kinds of additives and is now the focus of the refractory industry research object.Their common characteristics are: the addition of a small amount;Can significantly change a certain function or characteristic of refractory products;It has no serious effect on the main properties of the product.
The impurity composition refers to the part which is brought in or mixed in the production process due to the limited purity of the raw material and has bad influence on the performance of refractory products.In general, K.O, Na.O and Fe0 or Fe: O.All are harmful impurities in firebrick.
In addition, the acidic oxides (RO) in basic refractory bricks and the basic oxides in acid refractory bricks are considered as harmful impurities, which have strong fluxes at high temperatures.As a result, the formation temperature of eutectic liquid phase decreases and the amount of liquid phase increases.
2. Mineral composition
Refractory products are mineral components.The properties of the products are a comprehensive reflection of their constituent minerals and microstructure.Therefore, when analyzing the effect of the composition of the products on their properties, it is not comprehensive to analyze and investigate the chemical composition of the products, and the chemical mineral composition should be observed step by step.Under the condition of fixed chemical composition of refractory brick, due to the uniformity of composition distribution and different processing technology, the mineral type, quantity, grain size and bonding state in the composition of the products are different.For example, for siliceous products with the same Si02 content, two minerals with different structures and properties -- scaly quartz and quartzite -- can be formed under the same process conditions, so some properties of products will be different.Even if the mineral composition of the product is certain, the grain size, shape and distribution of the product will have a significant impact on the property of the product.
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