Corundum is to use high grade aluminium to alumina is machined through special technology and be become, have hardness good, cleanness spends tall, tenacity tall, light transmittance good, particle shape good, Bai Gangyu small pink particle size distribution is narrow, product wearability is strong wait for a characteristic. What corundum makes technology according to its is different, can divide wait for corundum product for corundum of Bai Gangyu, palm, Hei Gangyu. At present corundum price produces the limitation that is asked by environmental protection as smelt of aluminous alumina of current Henan and other places, crop relatively early days has glide apparently, at the same time China in region production electric power is not worth badly, cause market of near future corundum to supply overall slant close, the price somewhat small go up.
Corundum is with high grade aluminium oxygen pink is raw material, become via electric frit smelt. Its hardness corundum of palm of summary prep above, tenacity a bit low, purity ability of tall, good from acute sex, grinding is strong, calorific quantity small, efficiency is tall, acid-proof alkaline corrode, high temperature resistant, hot stability is good. Make with its grind, comfortable at grinding high-carbon steel, high-speed steel, stainless steel. It is used extensively still at nicety to cast, all sorts of pottery and porcelain such as porcelain of fireproof, 95 report, adornment porcelain and daily life use steely and fireproof, chemical industry porcelain, and the high-tech industry such as war industry, electron. This product applies to the polish of all sorts of accurate instrument spare partses, of machine tool main shaft super- essence of life is abrade reach crystal and abrade polish, oilstone exceeding essence of life is made, steel ball polish. Use extensively at electron, telescope, glasses, bearing, quartz the abrade polish such as advanced and crystal, fireproof material.
Corundum has hardness tall, grain is compact. Odd grain circle has been spent. Color is pure white, without foreign matter, assure wear-resisting layer or wear-resisting paper colour and lustre and transparency. Particle size distribution is centered equably, odd grain form is consistent, with relatively a few can amount to bigger wear-resisting effect. It is the high grade corundum that becomes via fusion of more than 2000 degrees of high temperature oneself choicely is raw material, be made subtly and become, its are chemical function stability and acid, alkaline do not produce effect, hot contractility is dinky.
The main material of corundum brick has character:
1, palm corundum:
Palm corundum brick is with aluminous alumina, anxious carbon (anthracitic) for main raw material, become via smelt of 2000 degrees of high temperature inside electric arc furnace, main and chemical composition is contained for annulus of titanium of alumina, oxidation a few oxidation silicon and ferric oxide, microscopical hardness HV1800-2200, tenacity is taller than SIC, grind with what palm corundum makes, comfortable the metal that fights Zhang Jiaogao at grinding, wait like all sorts of general steel products, malleable iron, hard bronze, also can make palm corundum brick, it is a kind of advanced and fireproof material.
2, Bai Gangyu:
White corundum brick is with alumina pink is raw material, become via high temperature fusion. Show white, brick of corundum of hardness comparing palm slightly tall, tenacity is a bit low. Make consummate grind apply to high-carbon steel, high-speed steel and quench steel the grinding that wait. Bai Gangyu also but abrade polish material, still can make nicety cast advanced and pottery and porcelain of accelerant of material of molding sand, spray, chemical industry, special type, fireproof material to wait.
3, tall aluminous corundum:
Brick of tall aluminous corundum is to use high grade aluminous alumina to be main raw material, special technology smelt is used in the muffle furnace of 2500 ℃ and become. Inferior white corundum brick is produced on foundation of brick of corundum of high quality palm. Because its are chemical,composition and physical function all are close to with Bai Gangyu, friend says inferior Bai Gangyu. Inferior Bai Gangyu is produced on foundation of corundum of high quality palm. Because its are chemical,composition and physical function all are close to with Bai Gangyu, friend says inferior Bai Gangyu. Bulk density ≥3.8g/cm2, fireproof spend ≥1850 ℃ . This product has the hardness of white corundum brick, hold the tenacity of palm corundum brick concurrently at the same time, it is good advanced and fireproof stuff and abrade material.
4, zirconium corundum:
Zirconium corundum brick is with alumina, zirconia is for raw material in electric arc furnace become via smelt of high temperature of 2000 ℃ above. Quality of a material is tough, the structure is compact, intensity is high. Zirconium corundum is main and mineral it is A- alumina and alumina - zirconia forms in all crystal. The melting point of alumina is 2050 ℃ , the melting point of zirconia is 2690 ℃ . In alumina content 42.6% , alumina and zirconia are when temperature is 1710 ℃ in all brilliant dot. After composition is affirmatory, when temperature is comprising above of fluid look line accordingly, change its temperature to won't bring about the occurrence of new look. When thermal drop arrives on line of look of corresponding constituent fluid, brilliant photograph begins separate out, fluid photograph composition nods direction to change along Xiang Gongrong of fluid look line. Achieve when temperature in all when melting point, by in all at the same time alumina of photograph of separate out brilliant mixes the scale in melting point composition zirconia in all frit photograph. When zirconium corundum fuse-element is cooling, begin to produce crystal. Crystal dimension carries control crystal growing rate commonly, adopt namely urgent cold (super-cooling) the method will come true. To ensure the quality of zirconium corundum, except logical choice smelt metal parameter reachs craft, outside cooling craft and treatment craft, choose appropriate additive, reduce content of silicon of the oxidation in zirconium corundum brick, oxidize aluminium and zirconia in all brilliant and the structure is even the key that etc also is production of zirconium corundum brick.
5, chromic corundum: Chromic corundum brick points to brick of agglomeration chromic corundum namely. It is raw material with α-Al2O3, join fine white of chromic pink of right amount oxidation and chromic corundum grog, via shaping, firing below high temperature. Chromic content of oxidation of agglomeration chromium firm brick is common under brick of founding chromic corundum. Still can use slop pouring the law comes preparation, α-Al2O3 pink and oxidation chromium pink mixes equably, add degumming agent and organic cohere agent to make thick stiff slop, join grog of partial chromic corundum at the same time, become adobe with the legal system that note an oar, again firing. Can use as brick of cover board of throat of the vitreous kiln liner, glass that pull silk and use at furnace of aerification of pressurization of oar of coal of incinerator of device of molten iron pretreatment, rubbish, water to carry line on the back to wait.
6, single crystal corundum:
Alumina of frit of single crystal report (renown 32A) abrasive: Single crystal corundum is with aluminium alumina is main raw material, deserve to add right amount sulfide, become via high temperature fusion. Show hoar or shallow earth yellow, hardness tall, tenacity is big. Single crystal corundum uses special technology production, each granuality is tasted arise for natural crystallization, machinery of and rather than smashs result. Goods of single crystal corundum is the heat-resisting with a kind of first-rate tenacity high-grade and abrade material, use at making advanced cut and sharpener, apply to tall vanadium high-speed steel, austenite stainless steel, the tall hardness such as titanium alloy, the grinding of tall tenacity material, use at working to grind the grinding with workpiece of changeful form easy burn to machine especially.
7, microcrystalline corundum:
Microcrystalline corundum is with aluminium alumina is main raw material, fusion of classics high temperature, through urgent cold crystallization pattern and obtain. Colour and lustre, chemical component and palm corundum are similar. Crystal dimension small, tenacity is big, good from acute sex. Grind with what its make, apply to heavy load grinding, shape grinding, infeed grinding and barren are ground. The grinding that also applies to steel of stainless steel, carbon steel, bearing and special type nodular cast iron to wait.
Compact Bai Gangyu is a kind of high-grade and fireproof material, advocate brilliant photograph is α- - Al2O3, color is hoar. The product has melting point density of tall, bulk is big and the characteristic with low porosity, stability of the admirable wearability, sex that fight broken bits, bulk and heatproof shake property are had below high temperature, in be being considered as white corundum series relatively fireproof raw material.
Corundum not comes stone brick basically is to use the characteristic of structure of crystal of electric frit Bai Gangyu and electric frit Mo Laishi, a variety of compound accretion are added in matrix, below high temperature action, formed advocate brilliant photograph is for photograph of corundum, second brilliant or prism shape not comes stone, advocate ossification of mutual accumulation form wears brilliant look, second brilliant photograph alternates between Yu Zhujing photograph, the matrix fill of a variety of compound accretion is in the interlinks net wearing space of photograph of brilliant of primary and secondary, make material of pottery and porcelain forms the integral structure of close together and firm union, achieve its good reason to turn performance thereby.
Brick of compound palm corundum basically is the crystal structure characteristic that uses corundum of electric frit palm, framework effect has in goods, generate β-SiC to be together with felt of palm corundum grain, make goods forms firm organization structure, the put in order that obtains ideal thereby changes target, not only goods has taller mechanical property, and formation β-SiC photograph jammed air hole makes compact, apparent pore leads product low, the optimal union of the good performance that it is raw material itself is collective the result of action.
Corundum not comes stone brick and the main approach that brick of compound palm corundum achieves afore-mentioned performance are different, what will surely bring about its application characteristics is different. Be like: ? Dirty does pledge green? basis experiments then is the result knowable: ? ┘ of of word of of billabong patch up loses jade of Huanggang of qualitative? of sulphur wining with dregs Mo Laishi brick second Yu Gangyu Mo Laishi, the index of corrode of broken bits frit of brick of compound palm corundum > 8%; corundum Mo Laishi brick fights Mo Laishi brick, Huang Gangyu Yu Fu of it may not be a bad idea of molten iron aggressivity adds up to palm corundum brick, appear the reason most propbably of this kind of circumstance and essence of both raw material, those who organize a structure to go up is different have close relationship.
Industry of compact white corundum produces medium utility:
Compact Bai Gangyu is iron of the blast furnace that make channel is pouring bag of makings, steel is pouring makings, pound dozen of makings, prefabricated component to wait for indeterminate form fireproof material and Lian Zhu 3 big, breathe freely mouth of brick, water the ideal of all sorts of boarding goods such as the brick, white corundum of compact report frit is used extensively at the industry such as steely, cement, pottery and porcelain, petrifaction.
Corundum brick function:
1, 99.70% corundum 1650 ℃ of 1800 ℃- - 1700 ℃ corundum is in oxidation and reducing atmosphere, have good high temperature insulating properties and mechanical strength. Heat conduction rate is old, heat expands rate is minor. In 1700 ℃ above and air, vapor, hydric, carbon monoxide do not have reaction. Short-term use temperature higher 1800 ℃ .
2, 99.35% corundum 1600 ℃ of 1750 ℃- - 1650 ℃ corundum is in oxidation and reducing atmosphere, have good high temperature insulating properties and mechanical strength. Heat conduction rate is old, heat expands rate is minor. In 1700 ℃ above and air, vapor, hydric, carbon monoxide do not have reaction. Short-term use temperature higher 1800 ℃ .
3, 85.00% tall aluminium tall aluminium is in 1290 ℃ of 1350 ℃ in oxidation and reducing atmosphere, have good high temperature insulating properties and mechanical strength. Heat conduction rate is old, heat expands rate is minor. With air, vapor, hydric, carbon monoxide do not have reaction. In change of lukewarm field temperature not big case falls can use for a long time. Short-term use temperature higher 1400 ℃ .
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