Chromium oxide green used as Oxide
FDA Approved Green Pigments.
As a raw material for refractory materials
Chromium is often used in refractory materials in the form of chromium oxide green. Chromium-containing refractories have excellent resistance to high temperature, corrosion and abrasion, and they have a wide range of applications in various industrial fields, including metallurgy, glass, chemical, and power industries.
Chromium-containing refractories include magnesium-chromium, aluminium-chromium and high-chromium refractories. Magnesium-chromium refractories are commonly used in industrial fields such as steel, cement and non-ferrous metal smelting. High-chromium refractories are used in coal gasification furnaces and high-performance alkali-free glass melting pots.
Most of the chromium oxide green is used in high chromium refractory bricks, this class of refractory materials of chromium oxide green additive amount reaches more than 80%, and are all dense refractory materials. High-chromium refractories are mostly used in harsh environments with high temperature and high pressure, accompanied by huge thermal stress, alternating oxidising and reducing atmospheres, and subjected to slag flushing and erosion, so how to reduce the porosity of refractories, initial cracks, and gaps between bricks and bricks has become a headache for various manufacturers, and we have developed different chromium oxide green products to improve the production of high-chromium refractory and the application of the process. Problems.
High-chromium refractories are often used in more demanding environments. Although high chromium refractories show better durability with the addition of substances such as phosphate, magnesium oxide or aluminium oxide, the large number of pores, incipient cracks and crevices in the construction process of the industrial refractory material itself provide a channel for slag to penetrate and corrode into the interior of the material, and penetration is intensified and spreads under the impetus of air pressure. There are two main types of damage to high chrome refractories:
1. Spalling caused by volume shrinkage or collision
Improvement of the production process to improve the densification and resistance to thermal vibration of high Cr refractories, and reduction of the porosity of high Cr refractories through the use of our special process of chromium oxide green.
2. Volatilisation of Cr
The volatilisation of Cr is unavoidable in high chrome refractories, how to reduce the volatilisation of Cr, by using our Pure ™ series of chrome oxide green products, our high temperature chrome oxide green by reducing the content of hexavalent chromium and their trace elements to reduce the Cr volatilisation caused by the porosity and microcracks generated.
We recommend our unique type G-5699 chromium' oxide green, which is often used in unqualified castables due to its unique bimodal structure.
The addition of different Chromium Oxide Green micropowders has a greater effect on the workability of the castables. The coarser the particle size of the added chromium oxide green with peaks, the higher the amount of water added to the castables; and the amount of water added to the castables with single-peak alumina micro-powder under the same particle size is obviously higher than that with double-peak chromium oxide green micro-powder, which is mainly due to the double-peak chromium oxide green micro-powder particle size is bimodal distribution, which can be fully filled into the pores of the castables to form a close build-up, resulting in the release of the encapsulated free water, wetting the surface of the particles, so as to make it have a good mobility, and thereby reducing the amount of water to improve the construction performance of castables. Construction performance.
The porosity and bulk density of the castables using bimodal chromium oxide green powder are obviously better than those using single-peak chromium oxide green powder.This is mainly due to the fact that bimodal chrome oxide green powder has a better filling effect on the castables than single peak chrome oxide green powder, so that the apparent porosity is reduced, thus increasing the density of the casting moulding.
The Pure TM chromium oxide green can reduce its migration of Cr+6 through special process. Our
optimal product can decrease the migration of Cr+6 to 0.0018ppm (use IC-UV or LC—ICP-MS
to analyze) and make sure that it will not bounce in a long-term storage, the water content will not
change, and it will not agglomerate.
Acts as a wear-resistant material on the surface of an object
Cr2O3 coating has high hardness, low coefficient of friction, good wear resistance and polishing performance, and stable chemical properties. It is suitable for parts that are resistant to abrasive grain wear, hard surface wear and particle erosion and cavitation under 540℃.Corrosion-resistant wear coatings for parts used in chemical media under 250℃; fibre-resistant wear coatings. Far infrared and heat radiation coating. It has been widely used in machinery, petrochemical, aviation and textile industries.
Chromium oxide green has some applications in polishing materials. Polishing materials are a class of materials used for surface polishing and grinding, commonly used in the processing and finishing of metals, stone, ceramics and other materials. Here are some applications of chrome oxide green in polishing materials:
Metal polishing: chromium oxide green can be used as one of the components of metal polishing materials. It has certain abrasive properties and can effectively remove oxide film, stains and scratches on the metal surface, restoring the lustre and surface quality of the metal. Chrome oxide green can also have a certain chemical reaction with the metal surface, forming a protective oxide film, improving the corrosion resistance and oxidation resistance of the metal.
Stone polishing: Chrome oxide green can be used for stone polishing and restoration. Stone surface often has scratches, spots and unevenness, chrome oxide green can fill and polish these surface defects, flatten the surface of the stone, and improve the luster and texture of the stone. Chrome oxide green can also react with the stone surface to form a protective coating, improving the stone's abrasion resistance and corrosion resistance.
Ceramic polishing: Chrome oxide green can be used for ceramic polishing and restoration. Chromium oxide green has certain abrasive properties, which can remove the imperfections and roughness on the surface of ceramics and improve the finish and brightness of ceramics. Chromium oxide green can also form a smooth coating with the ceramic surface, increasing the abrasion and corrosion resistance of ceramics and extending the service life of ceramics.
Chromium oxide green has some applications in friction resistant materials. Friction-resistant materials are materials with wear-resistant properties that can maintain good performance and life under working conditions such as friction, wear and abrasive impact. The following are some applications of chromium oxide green in friction resistant materials:
Surface coating: chromium oxide green can be used as one of the components of friction resistant coating materials. It has high hardness and abrasion resistance, and can form a hard coating on the surface to increase the wear resistance and friction resistance of the material. This coating is commonly used for surface protection and repair of metals, plastics, ceramics and other materials to extend their service life.
Additives: Chromium oxide green can be used as an additive for friction-resistant materials. Incorporating chromium oxide green into the formulation of friction-resistant materials can increase the hardness, compression resistance and abrasion resistance of the materials. The shape and size of the chromium oxide green particles can also change the friction characteristics of the material, reduce the friction loss and the amount of wear, and improve the performance of the material under friction conditions.
Composites: Chromium oxide green can be compounded with other friction-resistant materials to form composites with excellent friction-resistant properties. During the preparation of composite materials, chromium oxide green can be fully combined with the matrix material to form a composite structure and improve the hardness, toughness and wear resistance of the material. This composite material is commonly used in the manufacture of friction vice, mechanical seals and friction materials.
It is necessary to reasonably select the content, particle shape and addition method of chromium oxide green according to the specific application needs and process requirements to obtain the best friction resistance performance. At the same time, the design and preparation of friction-resistant materials also need to consider other performance requirements of the material, such as strength, toughness, corrosion resistance and so on, in order to meet the needs of practical applications.
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