Mullite brick features

Refractoriness higher, up to 1790 ℃ or more. RUL starting temperature 1600 ~ 1700 ℃. Cold crushing strength 70 ~ 260MPa. Good thermal shock resistance. Sintered mullite bricks and fused mullite brick two kinds. Sintered mullite brick high bauxite as main raw material, adding a small amount of clay or raw bauxite as binder, after molding, firing and made. Fused Glass beads mullite brick high bauxite, alumina and fireclay as industrial raw material, fine-grained charcoal or coke as a reducing agent, to produce fused after forming method using the restore. Fused mullite sintered mullite crystallization than big, good thermal shock resistance than sintered products. Their performance depends on the content of the high temperature alumina brown fused aluminum oxide and mullite phase uniformity of the glass. Mainly for roof stove, blast furnace body and bottom, glass melting furnace regenerators, ceramic sintering furnace, petroleum cracking system dead lining and so on.

Principle of abrasive blasting

Sandblasting is powered by compressed air, to form the appearance of high-speed jet beam will spray material (copper sand, quartz sand, silicon carbide, iron ore, Hainan sand) high-speed jet to the surface to be processed, so that the outer surface of the workpiece surface or shape changes due to impact and abrasive cutting action on the workpiece steel fiber for concrete steel fiber for concrete  surface, the surface of the workpiece to obtain a different cleanliness and roughness, so that the mechanical properties of the surface is improved, thereby improving the fatigue resistance of the workpiece, increasing the it and the adhesion between the coating to extend the durability of the coating, but also conducive to peace and decorative paint flow

Synthetic diamond

Unstained "temperament . Diamond also known as diamond, because it is the very nature of the hardest substances Mohs hardness of 10 , microhardness 10000kg/mm2, quartz micro hardness than 1000 CBN abrasive grit times , 150 times higher than corundum . it 's extremely difficult to form and found that it is carbon in the deep Earth under special conditions of high temperature and pressure after millions of years of " penance " turned into , due to the movement of the crust , they came to the surface from the depths of the earth, hidden in kimberlite , which was discovered and mined humans , although humans can produce a synthetic diamond , but the quality is still far less than the size of a natural diamond .

CBN abrasive grit,alluvial garnet gbrasives,waterjet abrasives: Synthetic diamond manufacturing method

CBN abrasive grit,alluvial garnet gbrasives,waterjet abrasives: Synthetic diamond manufacturing method: Direct method Artificial diamond or high pressure high temperature technology using instantaneous static or dynamic high pressure high tem...

Synthetic diamond manufacturing method

Direct method
Artificial diamond or high pressure high temperature technology using instantaneous static or dynamic high pressure high temperature techniques, or a mixture of both techniques , carbonaceous materials such as graphite, to make changes directly from a solid or molten state to the diamond, diamond obtained by this method are micron size polycrystalline powder.
Melting media law
Static high pressure synthetic diamond (50 ~ 100kb, i.e., 5 ~ 10GPa) and high temperature (1100 ~ 3000 ° C) by techniques synthetic diamond such as graphite, diamond produced by the reaction of carbonaceous materials and certain metals ( alloys ) , which is typically a crystalline cubic ( hexahedron ) , octahedron and six - octahedra and their transitional forms . Show important applications in industry is mainly static melting media law . This approach was abrasive grade synthetic diamond production has more than natural diamond , pending further problem is to increase the ratio of coarse-grained , improve the conversion rate and improve the crystal quality . Laboratory studies are currently using static media law of large particles melt quality single crystal diamond formation. Seeded epitaxial growth of large single crystals has been one karat weight around ; later improved slightly with the general testing techniques , has been crystal of about 2 to 4 mm . This method also uses a large particle growth and sintering of polycrystalline diamond, which has been obtained in certain industrial applications, the key problem is to further improve the compressive strength of polycrystalline diamond , impact strength, Fused zirconia mullite wear resistance and overall performance and heat resistance .
Epitaxy
Synthetic diamond is the use of certain hot carbonaceous material and the electrolytic solution of the carbon deposited on the seed crystal diamond substrate or from the action of certain substances formed by epitaxial growth .
Wurtz reaction
Let carbon tetrachloride and sodium at 700 ℃ reaction of diamond . But will also generate a lot of graphite.
Formation mechanism
There are several theories following : the doctrine that the solvent metal ( alloy ) plays the role of carbon in a solvent ; catalytic doctrine is considered to be a catalyst ; solid phase transition theory emphasizes the disintegration of the graphite crystal without bond breaking , formed through a simple deformation diamond crystal . But the theory put forward by the three typical models are often contradictory with some of the major experimental phenomena and laws . Therefore , there solvent - catalyst , the catalyst - solvent , melt ( solvent ) agent - catalyst ( referred to as melting media ) are used to further explore other theories metals (alloys ) role. In general , the formation mechanism of synthetic diamond is still a still exploring the complex issues .
Associated thermodynamic

Abrasive blasting range of applications

( A ) coating the workpiece , the workpiece can blasting treatment before bonding the surface of all dirt or rust removed and the surface of the workpiece is important to establish the basis of the drawings ( which is usually called the matte side ) , and can be through the exchange of different size abrasive , abrasives such as abrasive Chin achieve CBN abrasive gritvarying degrees of roughness , greatly improving the work with paint, coating material adhesion. Or so pieces of adhesive bonding stronger , better quality .

(B ) casting matte , sandblasted after heat cleaning and polishing the workpiece can clean up the castings and forgings , all the dirt surface after heat treatment (eg, oxide , oil, and other residues ) , and to improve the surface finish of the workpiece polishing can make workpieces exposed metal color uniform , so that the workpiece looks more beautiful, beautiful.
(C ) machined parts deburring and surface blasting can clean up the surface to beautify the tiny glitches, and make the surface more smooth , eliminating the hazards glitches and improve the quality of the mold for grinding wheel workpiece. And sandblasting can play a small fillet at the junction of the workpiece surface , the workpiece is even more beautiful, more sophisticated .
(D ) to improve the mechanical properties of the parts after sandblasting machine parts , can produce a uniform fine uneven surface in parts of the surface , so that oil get stored , so that lubrication conditions improve and reduce the noise to improve the mechanical life.
(E ) light decoration effect for some special purpose parts, sandblasting can easily implement different reflective or matte . Such as stainless steel parts , plastic grinding , polishing , wooden furniture matt surface of jade , patterns frosted glass surface and texturing surfaces such as fabrics .

Firebrick Features

Own property
1, the chemical composition of : determining the main component of the quality and characteristics of the refractory
2 , bulk density: weight per unit volume , density , indicating good density , high strength may , but probably large thermal conductivity
3 , apparent porosity : not to make a sandblasting material specific request, but manufacturers must be strictly controlled as apparent porosity .
4 , RUL : Also called high-temperature load deformation temperature start , this parameter is very important, high temperature resistance marker material
5, the thermal shock resistance : resistance to sudden temperature change capacity without being destroyed
6 , the compressive strength : bear ( room temperature ) maximum pressure capability
7 , flexural strength : the ability to withstand the shear stress
8 , the linear rate of change : change , also called heavy firing line or call residual line changes , refer to the expansion and contraction of each change in volume occurs at the same temperature alluvial garnet gbrasives change , if every expansion and contraction , we define such a linear rate of change 0
Physical and chemical properties
1, wear resistance :
2 Thermal conductivity : the unit temperature gradient conditions by the rate of heat flow per unit area of ??the material , with a porosity of about
3 , Impact resistance: do not explain it , good impact resistance , service life is long
4 , slag resistance : ability without being destroyed slag erosion resistance at high temperatures