Different types of refractory materials are used depending on the temperature and usage conditions of applications such as boilers, furnaces, kilns, ovens, etc.

• Clay refractory. …
• Silica brick. …
• High alumina refractory material. …
• Magnesium refractory. …
• Chromite refractory. …
• Zirconia refractory.

How many kinds of refractory materials are there?

Insulating refractory materials can be further divided into four types: Heat-resistant insulating material, operating temperature ≤ 1100 °C. Refractory insulating material with application temperature ≤1400°C. High refractory insulating material with application temperature ≤1700°C.

What are the three categories of refractory materials?

According to this classification, refractory materials are divided into three categories, namely (i) acid refractories, (ii) basic refractories, and (iii) neutral refractories. There are also some special types of refractories. Acid Refractories – These refractories are attacked by alkali (alkaline slag).

What are alkaline refractories?

Alkaline refractories include Minerals such as lime (CaO) and magnesium oxide (MgO) And can be used in a basic similar environment. Neutral refractories typically contain various forms of chromium in varying amounts, combined with alumina or magnesia, which work well in the middle of the acid/base spectrum.

What are refractory materials used for?

Fireclay refractories: they are mainly used in steel industry. They are also widely used in foundries. Magnesium refractory: Mainly used for the lining of basic converter and open hearth furnaces in the iron and steel industry. Dolomite refractory: generally used as a repair material.

What is a refractory material? ? ?Types of Refractories / Ceramic Materials / Materials Science

34 related questions found

What are the characteristics of refractory materials?

Properties of refractory materials

• Abrasion resistance.
• bulk density.
• Cold pressed strength.
• creep.
• melting point.
• Porosity.
• Thermometer cone equivalent.
• Refractoriness under load.

What are the properties of refractory materials?

Important properties of refractories include Chemical composition, bulk density, apparent porosity, apparent specific gravity and strength at atmospheric temperature. These characteristics are often one of those used as « control points » during manufacturing and quality control.

What is special refractory?

Special refractory materials mainly include High melting point oxide, high melting point non-oxideand derived composite compounds, cermets, high temperature coatings, high temperature fibers and reinforcements.

An explanation of how refractory materials are selected?

The refractory material should have a stable volume at high temperature, and the residual expansion and contraction should be small. Thermal properties such as thermal capacity, thermal expansion coefficient and thermal conductivity should meet the requirements. The refractory material should be neat in appearance and accurate in shape and size.

What is super refractory?

Refractory is A material that retains its shape and chemical properties at high temperatures And used in applications requiring extreme heat resistance, such as furnace linings. Refractory products are mainly used in heat-resistant, airtight and other industries.

What are the general requirements for refractory materials?

The general requirements for refractory materials can be summarized as: 1) It can withstand high temperatures and collect heat in confined areas such as furnaces; 2) Ability to withstand the effects of molten metal, hot gas, slag erosion, etc.; 3) Its ability to withstand loads under service conditions; 4) Its…

What is acid refractory?

Acid refractory is Not attacked or affected by acidic substances, but easily attacked by alkali (alkali slag). These are used in areas where the slag and atmosphere are acidic. Acid refractory materials include zirconia (ZrO2), alumina (Al2O3), silica (SiO2) and refractory clay bricks.

What is the refractory industry?

Refractory is Ceramic material These are essential for all high temperature industrial processes as they provide mechanical strength, corrosion protection and thermal insulation. … The WRA video below details the impact of the industry in greater depth.

How many types of refractory bricks are there?

There are three varieties Refractory bricks.

What is a refractory patient?

(reh-FRAK-tor-ee) In medicine, Describe a disease or condition that does not respond to treatment.

What are refractories and their types?

Typical refractory materials include Clay refractoryHigh alumina refractories, silica bricks, magnesite refractories, chromite refractories, zirconia refractories, insulating materials and amorphous refractories.

What are refractory materials?

Commonly used minerals for refractories include (but are not limited to) Alumina, bauxite, graphite, kaolin, magnesia and zirconium. These minerals are produced worldwide, but in some cases their grades are not always suitable for refractory applications (eg alumina and bauxite).

What are refractory minerals?

Refractory minerals can be defined as Mineral or synthetic inorganic crystalline phases with high melting points. They should also resist deformation and softening at high temperatures. … refractories are usually classified as acidic, alkaline or others.

What does refractory material mean?

Refractory is High temperature resistant materialsmainly used as furnace linings for high temperature material processing and other applications where thermomechanical properties are critical.

What is a refractory lining?

Refractory linings typically include A safety or backup layer behind the work lining that comes into contact with the furnace contents. The entire body is encased in a metal casing. The temperature gradient in the system and the properties of all materials must be considered.

What is a good refractory material?

The most common basic refractories are Magnesite, Dolomite, Lime, etc.. But lime, because of its tendency to dehydrate, has never been used as a refractory. Magnesite: This is the most important basic refractory material.

What are the requirements for good refractories?

A good refractory should Has a high RUL value. It is defined as the ratio of its pore volume to volume volume. Porosity is an important property of refractory bricks as it affects many other properties such as chemical stability, strength, wear resistance and thermal conductivity.

What does Rul test mean?

Refractoriness under load (RUL) is a measure of the deformation behavior of a refractory ceramic product under constant load and elevated temperature. … Compression creep tests are also carried out in RUL 421 up to 1700 °C.

What are refractory bricks made of?

The main raw materials of refractory bricks include refractory clay, mainly Hydrated aluminum silicates; minerals high in alumina, such as bauxite, diaspore, and kyanite; sources of silica, including sand and quartzite; magnesia minerals, magnesite, dolomite, forsterite, olivine; chromite, a solid solution of

What are refractories in the steel industry?

Refractory is Basic lining materials for furnace working interface and standby areas during manufacturing Steel, in specific sequential and continuous operations of forming, holding, mixing and transporting molten iron, molten steel and slag.