Our country present situation and countermeasure of Sic Refractory

microcrystalline alumina abrasive
The SG abrasive H&X calcium granules rely on import in our country, due to a few countries such as America, France's technology and market monopoly, and limited imports, at the same time, some foreign do abrasive has begun large-scale preempted market in our country, after China's accession to the WTO, this kind of circumstance also exacerbate, in this way, not only lose a lot of foreign exchange. And make the national industry of our country is facing huge impact. In view of the above situation, the author thinks that the abrasives industry in our country in the aspect of the development of microcrystalline alumina abrasive should adopt the following countermeasures, in response to foreign abrasive abrasive H&X garnet manufacturers of our market.
(1) to the development and application of microcrystalline alumina abrasive, and to realize the industrialization as soon as possible, to change the abrasives industry in our country at present large scale and low content of science and technology
(2) the international tendency, keeping a close eye on abrasives industry holding information, fight for change in a short time "generic" for "development";
(3) the technical secret job, put an end to loss of our country in this respect technology at home and abroad.

Brown Corundum product size

Product size in accordance with international standards and national H&X fused silica manufacturers of production, processing granularity according to user requirements. Universal size No. F4 ~ F320, its chemical composition varies depending on grain size. Prominent feature is the small crystal size, impact resistance and self-processing mill with broken particles are mostly spherical particles, sharp Pai corundum with high purity, dense texture, bulk density, self-sharpening, good toughness, H&X Aluminium hydroxide powder material Features ultra-low levels, which is made using abrasive grinding sharp, low fever, grinding ratio, and the use of less buildup; made of sintered abrasive with dark blue color after firing, can not afford to mesh cracks, no rust, suitable for the manufacture of ceramic, resin and high abrasive grinding and polishing.

Alumina Oxide organoaluminum compound

1, high-purity fumed aluminum H&X calcium silicon sulfate alum, ammonium sulfate, ammonium alum was synthesized (ammonium aluminum sulfate), dehydration, pyrolysis of alumina, and then by phase inversion to obtain γ-, α-alumina.
An organic aluminum compound in the polymerization of sticky polyaluminoxane solution, the aluminoxane solution polymerization was dry-spun fiber to obtain an organic aluminum compound, and then calcined alumina fiber.
The organic aluminum compound is polymerized to produce a viscous poly alumoxane solution, which use an ordinary dry spinning method, the fibers made ​​of an H&X white fused alumina suppliers aluminum compound. And then calcined to obtain alumina fibers.
2 Method 1. Crystallized aluminum sulphate dissolved in distilled water, and then slowly added under constant stirring solution of ammonium sulfate, ammonium aluminum sulfate was prepared:
Then heated to 100 ~ 200 ℃, after removal of water of crystallization, a high temperature burning pulverized into a powder, ignition starts at 800 ℃, and then heated to 1250 ~ 1300 ℃ burning 4h, alumina, obtained after cooling.

Impact SM superplasticizer and zircon refractory castable

Abstract: SM superplasticizer on castable flow values ​​and mechanical properties, as well as adding zircon aluminum powder for refractory castable material impact on the residual thermal shock flexural strength. The results showed that in the test range increases with SM castable flow amount increases, the volume density, reduced porosity, compressive strength, flexural strength increases; Zircon with increasing thermal shock 15 times the residual flexural strength increases first and then decreases.
Brown Corundum Industrial Technology> Chemical Industry> Portland Industrial> Industrial Refractories> Refractory Products> unshaped refractories> castable
Keywords SM superplasticizer zircon refractory castable

Adding aluminum-magnesium aluminum thermal properties of refractory castable

Summary : Overall the ladle lined with high Alumina Oxides castable aluminum powder can be added to improve its thermal properties, such as heat resistance and resistance to thermal shock resistance burst processing. Other mixtures of water and aluminum powder (magnesium oxide , bauxite cement ) mixing due to the formation H: gas permeability can be formed even cast material after casting vent . Metallic aluminum powder was determined to join the Department of A12O3-MgO castable burst resistance and thermal shock resistance of the research work carried out in the course of the trial . On the whole 300t ladle lined with castable A12O3-MgO conducted several tests, the results showed that the use of such material can improve the thermal casting performance and extend the life of the ladle in the ladle the whole lining.
aluminum powder, commonly known as " silver " , i.e., the silver metallic pigments , a small amount of lubricant is added to pure aluminum foil , crushed by ramming Chance squamous powder , and then polishing is made . Aluminum is light, floating force, hiding power, light and heat reflective properties are good . After treatment, can also become a non -leafing aluminum . Aluminum can be used to identify fingerprints , you can also do the fireworks . Due to extensive use of aluminum , the demand for large , multi-species , it is a large class of metallic pigments .

Silicon carbide refractories explanation

Studied the clay bonded black silicon carbide refractories performance. SiC sintered at 1 500 ℃ preparation containing 20% -60% SiC , the clay clinker and clay compacts . Analysis of the sintered compacts of physical, mechanical and fire-resistant properties, and discusses changes in phase composition . Containing 20% SiC and 40% SiC refractory material having a certain load at a high density , high refractoriness , and has good corrosion resistance , is often used in furnace lining . In the ceramic industry, with 40% SiC and 60% SiC refractories , as one of the high content of SiC , under certain load has good thermal shock resistance , oxidation resistance and refractoriness , it is often used as kiln burning tank cars and use .
Refractories Refractoriness of not less than 1580 ℃ for a class of inorganic non-metallic materials . Refractoriness is the refractory cone specimen in the absence of load cases, resistance to high temperature without melting down the softening temperature in Celsius . Sic Refractory materials are widely used in metallurgy industry , chemical industry , petroleum, machinery manufacturing, silicates , power , etc., the largest amount in the metallurgical industry , accounting for 50 % to 60% of total production.
Statistical data as a processing methods and techniques in the refractory industry has been widely used. Take it to the next production of refractories and refractory good run important decisions for the smooth conduct of refractories acceptance sampling for scientific refractory to draw final conclusions , made ​​an indelible contribution.

alloying

Rare earth reinforcement in the aluminum powder alloy, mainly fine grain strengthening, solid solution strengthening limited and rare earth compound second phase strengthening, etc. When not at the same time, for the amount of rare earths in rare earth aluminium alloy mainly exists in three forms: alpha (Al) solid solution in the matrix; Partial gathered in the grain boundary phase boundary, grain boundary and branches; Solid solution, or in the form of compounds in the compound. When rare earth content is low (less than 0.1%), rare earth mainly used two forms of distribution. The first form have the effect of the limited solid solution strengthening, the second type increases the resistance to deformation, promote the dislocation multiplication, the strength Calcium silicon. After joining the rare earths, the alloy as-cast organization, alloy grain size significantly reduced, could reduce the secondary dendrite spacing, rare earths and Al, Mg and Si element such as the formation of the intermetallic compound spherical and short rod distribution in grain boundaries or limits, distribution of a large number of dislocation in tissue. When the rare earth content is more than 0.1%, after a form began to dominate. At this time, rare earth with the other elements in the alloy begin to form many new phase containing rare earth elements; At the same time make change shape, size of the second phase, may make the second phase from a long strip shape into a short rod-shaped particles, such as, the size of the particles is also becoming more small, and scattered. Most containing rare earth elements in the second phase of the characteristics of the particles, the spheroidizing and refinement, this kind of change are reinforced aluminum alloy to some extent.

Rare earth is explained in rounding of aluminum and its alloys

Studies show that of Al - Si metamorphic process directly affects the bad effect of rare earths. Stability metamorphic organization is the key to reduce the loss of rare earth, and to prevent the rare earth together, in the rare earth evenly spread rapidly to the liquid Alumina Oxides; In order to obtain stable metamorphic organization, should as far as possible to improve metamorphic temperature, metamorphic strengthen let stand, after strictly grilled slag after refining, and as far as possible need not halogen element flux for refining and cover. Rare-earth has certain incubation period, must maintain a certain amount of time at high temperature, rare earth can maximize metamorphism.
Purification effect
Rare earths to gas and the impact on the rate of pinhole
Aluminum and its alloy in the casting process, a large amount of gas will dissolve in liquid aluminum, mainly hydrogen (about 85% of gas in liquid aluminum), followed by oxygen and nitrogen. Hydrogen source is mainly in charge of water vapor, aluminum ingots and leftover material of oil, water, and on the surface of the aluminium ingot aluminum "rust" - Al (OH) 3. Hydrogen is the main reason for the aluminum powders casting of pinhole, and significantly reduce the strength of the aluminum. All can in rare earth added to the aluminum and its alloy degassing effect. When less than 0.3% for the amount of rare earth, rare earth in addition to the obvious effect of hydrogen, reduce the amplitude of pinhole rate is the largest also. After more than 0.3% when the content of rare earth, rare earth content increases, the hydrogen content is slowed down. If Y, single rare earth La, when rare earth content more than 0.3%, the increase of the content of rare earth makes hydrogen content started to rise again, changes in the rate of pinhole has the same rule, but the change is more obvious. The author thinks that to hydrogen effect in order to Y > La > Re (mixed rare earth); From the content, a single rare earth content is less than 0.3%. Rare earth with oxygen, nitrogen can generate a kind of refractory compounds Re2O3 and ReN2. In the process of smelting, mostly in the form of slag elimination; At the same time, when temperature is less than 200 ℃, rare earth and fluorine, chlorine violent action can generate of rare earth and rare earth chloride, fluoride to remove fluorine and chlorine in aluminum. So, the rare earth in the aluminum alloy can be used as purifying agent.

Special diamond polishing technology products and Scope

Now more and more extensive use of polished sand in many areas consistent with the extensive use has been received , so that the scope of these products is very wide, polished sand below introduce you to the basic concepts and polishing abrasives scope .
Polishing sand profile:
High quality silicon carbide abrasive polishing sand as raw materials using modern new unique technology is refined . Abrasive polishing abrasives short time , high efficiency, good benefits , and low prices . The product hardness, high toughness, good self-sharpening , sand consumption is low and can recycle and reuse , grinding pieces of finish is good ; and chemical stability , wear resistance, acid and alkali. The abrasive shell-shaped fracture , sharp corners , constantly smashing step in the formation of new edges and the side edge , making it superior to other abrasive grinding capacity . In particular it has a high hardness, specific gravity , chemical stability and its unique advantages to become self-sharpening , polishing process with abrasive sand is preferred ; while the workpiece is polished rust cleaning , polishing the ideal material.
Polishing abrasives Scope:
Mainly used in the stainless steel surface decontamination, in addition to welding slag and matte effect , iron workpiece to rust, decontamination , descaling , increasing the coating , the coating adhesion, aluminum workpiece descaling, surface hardening , light decoration role of oxidized copper workpiece to Pia light effects , frosted glass crystal , engraved pattern , plastic products ( hardwood products ) matte effect , denim and other special fabrics , plush processing and effect patterns, according to user technical process conditions according to user requirements , customized for the user a variety of polishing abrasives such as sand with emery ; automobile factories, shipyards rust surface polishing with a polishing sand.