Refractory meaning and types of refractory materials

Refractory materials generally refers to the degree of fire in the 1580 C or more inorganic non-metallic materials, including natural ore (refractory raw materials) and according to a certain purpose and requirements, according to a certain process to produce a variety of products (fire resistance), with a certain degree of high temperature mechanical properties and good volume stability. Refractory materials are steel, nonferrous metals, petrochemical, building materials, machinery, electric power, environmental protection and even national defense and other important basic materials, but also a variety of high temperature industrial furnaces and equipment indispensable support materials. Technological progress of refractory materials plays an important role in the development of high temperature industry.
Type of refractory material:
1.Acidic refractory material usually refers to SiO2 content of more than 93% of the refractory materials. Its major characteristicis that it can resist the erosion of acidic slag at high temperature, but easy to react with basic slag. Acid refractory materials commonly used silica brick and clay brick.
2.Basic refractory material generally refers to Magnesium Oxide or Magnesium Oxide and calcium oxide as the main component of refractory materials. This kinds of refractory material has higher refractoriness, and it can resist basic slag.
3.Alumina silicate refractory is the refractory material which is mainly composed of SiO2 - Al2O3, according to the content of its Al2O3 can be divided into semi-siliceous (Al2O3 15 ~ 30%), clay (Al2O3 30 ~ 48%), high Aluminum (Al2O3 greater than 48%)
4.The fused cast refractory is a refractory product with a certain shape, which is melted by a certain method to melt the batch at high temperature.
5.Neutral refractory is refractory material which is not easy to react with acid or basic slag at high temperature. Such as carbon refractory and chrome refractory. Some of these materials are also attributed to this kind of Neutral refractory.
6.Special refractories are new inorganic non-metallic materials developed on the basis of traditional ceramics and general refractory materials.
7.Unshaped refractory is a mixture of refractory aggregate and powder, binder or other admixture, which can be used directly or after proper liquid mixing.
Article source: Refractory meaning and types of refractory materials

Ladle lining refractory materials

China's steel plants mainly used aluminosilicate refractory materials, including clay, alumina brick and so on in 1950s. Since the 1980s, China has successively developed the aluminum-magnesium carbon, coal quality calcium and magnesium and other several series of new steel package refractories. Where the aluminum-magnesium carbon refractory materials are of varieties, all specifications, is China's major ladle refractories.

In earliest 20th Century 50--60 years, a variety of clay bricks were mainly used in our country. Due to low cost, until the 1980s, some steel plants were using clay bricks as ladle lining material. Although clay bricks is no longer used as ladle material so far, it had made a great countribution for recovery and future development of China's steel industry in the early days.

With the continuous development of steelmaking technology, steel quatity and quantity, clay bricks was no longer used because of short service life. Some of our mills started using a variety of high alumina bricks as ladle lining material, in which way the ladle life got a greatly improvement, high aluminum ramming mass, wax brick, alumina magnesia, aluminum-magnesium casting material, aluminum-magnesium unfired brick, aluminum-magnesium spinel castable, aluminum MgO-C, magnesium aluminate spinel brick, aluminum-magnesium unfired brick and a series of high-grade refractory materials appeared to adapt to higher demand.

Article source: Ladle lining refractory materials

The main raw material of domestic powder metallurgy is no longer single

In the refractory raw materials, the current domestic powder metallurgy main raw material has not a single reduction of iron powder, electrolytic copper powder, the domestic has been able to produce atomized iron powder, stainless steel powder, high-speed steel powder, coated powder and various elements of metal powder, Powder, etc., can basically meet the needs of domestic production of high-strength parts, but also the production of special-purpose raw material powder, greatly expanding the powder metallurgy product varieties, but in quality and variety and abroad there is still a big gap.
In the powder metallurgy equipment, through the introduction of enterprises, the purchase of foreign powder molding presses, sintering furnace, mold processing and testing equipment and digestion and absorption, transformation of equipment used to improve product quality and shorten the gap with foreign production level provides a guarantee.
In the powder metallurgy products, has been able to produce high strength, complex shape of the powder metallurgy parts, such as passenger matching timing pulley, motorcycle supporting the use of primary driven gear and other structural parts. However, some, high-grade powder metallurgy parts (such as Buick cars powder metallurgy parts) need to import.
Enterprises to reorganize, cultivate large enterprises, large groups, to achieve scale of operation. Increase technical innovation and scientific research and innovation investment, speed up the new technology, new product development. Improve the mold design and manufacturing level, the application of computer-aided design and manufacturing. Products to high strength, complex shape and special performance of powder metallurgy parts direction. There have many kinds of refractory products in our factory. Such as fire brick for sale, refractory raw material, refractory nozzle, refractory fire brick for sale and other refractory products.
Article souce: The refractory raw material of domestic powder metallurgy is no longer single