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Composition and Properties of Refractory Materials (Ⅰ)

Composition and Properties of Refractory Materials (Ⅰ)

2023/10/16

Refractory refers to non-metallic materials with physical and chemical properties suitable for use at high temperatures, but it is not excluded that certain products may contain a certain amount of metallic materials (CB/T 18930-2002). Generally refers to the refractoriness of not less than 1580 ℃ inorganic non-metallic materials or products. Refractory materials have an iconic indicator-refractoriness, which refers to the characteristics of refractory materials that resist high temperatures without melting under load conditions. It can also be understood as the temperature at which the refractory material reaches a certain degree of softening under the action of high temperature. It is an indicator of material resistance to high temperature and can be used as a basic guarantee for the use of kilns at high temperatures. In the process of using refractory materials, in addition to being affected by high temperature (generally 1000~1800 ℃), it is also affected by physical, chemical, mechanical and other aspects, such as: bearing the load of furnace body and materials at high temperature; External stress in the operation process; Due to the rapid change of temperature, the great temperature difference caused by uneven heating and the resulting internal stress; Scour of various high temperature fluids, slag and smoke; the erosion of liquid metal, slag and impurity elements, the transformation and function of environmental atmosphere, etc. Therefore, the selection of refractory materials in addition to considering the refractoriness, but also need to consider the nature of the refractory material to fully resist the above effects, so that the refractory material can be applied under various operating conditions as much as possible.

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Composition and Properties of Refractory Materials (Ⅱ)

Composition and Properties of Refractory Materials (Ⅱ)

2023/10/16

1.1.2.3 Magnesia refractories Magnesia refractories refer to alkaline refractories with magnesia as the main raw material, periclase as the main crystal phase, and MgO content (mass fraction) greater than 80%. Usually according to its chemical composition is divided into:(1) magnesium products. w(MgO)≥ 87%, the main mineral is periclase. (2) magnesium aluminum products. W (MgO)>75%,w(Al,0,) is generally 7% ~ 8%, and the main mineral components are periclase and magnesium aluminate spinel (MgO, Al,O,). (3) magnesium chromium products. W (MgO)>60%,w(CrQ) is generally below 20%, and the main mineral components are periclase and chromium spinel.

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What are the six major types of raw materials commonly used in refractory materials?

What are the six major types of raw materials commonly used in refractory materials?

2023/10/16

Refractory raw materials are materials necessary for the production of refractory products. It is the basis for the production of refractory materials. Most of the refractory raw materials are natural minerals (such as refractory clay, bauxite, silica, chrome ore, magnesite, dolomite, forsterite, zircon, kyanite, sillimanite, andalusite, etc.). With the continuous improvement of the requirements for the comprehensive performance of refractory materials, industrial raw materials and synthetic raw materials (such as industrial alumina, synthetic mullite, man-made refractory fiber, man-made refractory hollow ball, etc.) are increasingly used in the production of refractory. The quality and cost of refractory products depend to a large extent on the correct selection and rational use of raw materials.

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6 large refractory building materials

6 large refractory building materials

2023/10/16

Most fatal fires occur while people are sleeping at home because the smoke can cause a person to fall into a deep sleep. While no practical building material is truly fireproof, well-constructed homes and buildings can help prevent these types of tragedies by using relatively fire-resistant materials.

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What are the types of refractory materials?

What are the types of refractory materials?

2023/10/16

Refractory materials are widely used in metallurgy, chemical industry, petroleum, machinery manufacturing, silicate, power and other industrial areas. It is a class of inorganic non-metallic materials with a refractoriness of not less than 1580 ℃. So what are the types of refractory materials?

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What is refractory

What is refractory

2023/10/16

Refractory materials generally refer to inorganic non-metallic materials with refractoriness above 1580 ℃. It includes natural ore and in accordance with certain requirements of the purpose of a certain process made of a variety of products, including high alumina brick, clay brick, insulation brick, castable and so on. Has a certain high temperature mechanical properties, good volume stability, is a variety of high temperature equipment necessary materials. So many refractory materials are how to classify?

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