Corundum brick manage changes index density fireproof degree

   Corundum brick is to contain Al2O3, the goods of 90% above. Corundum brick is divided again be half recombine or combine corundum brick and compact corundum brick directly. Half recombine or brick of direct union corundum are with electric frit corundum (or agglomeration corundum) with agglomeration alumina fine pink is raw material, vitriolic aluminium or pulp waste liquid are bond, the corundum that after high pressure shapes, agglomeration falls in 1750~1800 ℃ high temperature and becomes is fireproof goods. Compact corundum brick is with burning alumina gently fine pink is raw material, methylic cellulose or dextrin are carboxyl bond, collect labour of choose and employ persons to build bead, after machine pressing shapes, the corundum that agglomeration falls in 1750~1800 ℃ high temperature and becomes is fireproof goods. It has Al2O3 content tall, apparent pore leads extremely low, intensity tall, corrosion resistance and erode the gender is strong wait for a characteristic, apply to the liner that makes synthetic ammonia change furnace.

 

Because 1. has the property such as high temperature resistant, anti-corrosive, high strenth, reason is used do irrigate steel slip water mouth, alloy of smelt rare precious metal, special type, tall pure metal, glass pulls the crucible of glass of the silk, laser that make and containers esp. for use in the house; Kiln of all sorts of high temperature furnace, the liner that is like blast furnace of fireproof material, pottery and porcelain, puddling (wall and canal) ; Manage changes household utensils, sparkplug, heat-resisting to fight oxidation coating. SiO2 is less than the brick of corundum of low silicon agglomeration of 0.5% is the special lining of reaction furnace of ammonia of carbon black, boracic chemical industry, chemical fertilizer, synthesis and vaporization furnace;

 

Because 2. has hardness big, wearability the characteristic with good, high intensity, in chemical system, use as all sorts of reaction household utensils and conduit, the component of chemical pump; Make all sorts of mechanical component, patterns, wait like mouth of model of candied floss model, crowded pencil core; Make cutting tool, grind an abrasive, ballproof material, human body articulatory, sealed grind annulus to wait;

 

Because 3. has high temperature insulating properties, reason is used as the canal covering silk of thermocouple and protective canal, use in the atomic reactor insulating properties as before admirable, together with loss is not big, dielectric constant is not big also, be used extensively at solid in electronic industry antennae of radar of socket of substrate of compositive electric stove, crust, porcelain wearing, scanty window, missile protects a cover to wait;

 

4.Al2O3 belongs to ion crystal, the structure is very stable. Use below high frequency, high pressure and higher temperature, its insulating properties as before admirable, together with loss is not big, dielectric constant is not big also, be used extensively at solid to be squeezed into antennae of radar of window of circuit substrate socket, crust, porcelain wearing, small Bo, missile to protect a cover to wait in electronic industry;

 

Air-tightness of 5. corundum goods is good, although be below high temperature,also father airproof, because this gets applied extensively in electrovacuum, if use corundum to make the biserial in microcircuit of all sorts of large electron envelope, solid insert type to enclose crust continuously;

 

6. corundum insulation material, if corundum is light qualitative brick, corundum is hollow ball and fiber, wide application and the boiler setting of kiln of all sorts of high temperature furnace reach furnace top, already high temperature resistant heat preservation;

 

Goods of 7. transparent corundum can make cover of commutate of tube, microwave. Additional, na-b-Al2O3 goods is the electrolyte material of batteries of production natrium sulfur.

 

Corundum brick is brick of light qualitative corundum and brick of heavy qualitative corundum according to bulk density cent, the corundum brick of different bulk density performance characteristics is distinct, the manage of the requirement changes index to emphasize particularly on to also differ, we classify the introduction to issue brick of light qualitative corundum and manage of brick of heavy qualitative corundum to change index to undertake introductory below.

 

The corundum brick that we often say weighs qualitative corundum brick namely, detect the manage of brick of heavy qualitative corundum changes index cent to be physical function index and chemical function index.

 

Physical function index namely the bases content of corundum brick, whether does alumina content achieve use demand.

 

Chemical function index has the following classification:

 

(1) is fireproof degree reach loading bate temperature, detect of corundum brick fireproof degree consult as the basiccest high temperature capability, loading bate temperature can serve as the reference of use effect.

 

(2) bulk density, of bulk density detecting is corundum brick necessary detect project, of the discretion of bulk density index and corundum brick compact have particular concern, can react of corundum brick fight erode ability.

 

(3) compression fights lose strength: Detect of corundum brick fight fold compression intensity to be able to understand corundum brick to whether can resist slaggy the attrition of the fluid that reach frit, erode ability, the flank of its service life reacts.

 

(4) fights those who heat up shake sex index to detect is urgent to corundum brick hot urgent cold ability detect.

 

(5) weighs the change that burn a line: This project is right corundum brick does what whether systole appears below high temperature environment 2 times to detect, its remains shrinkage is in what limits.

 

Above these are counterpoise pledge corundum brick manage changes target detect, specific still change index to undertake detecting with the corundum brick manage of actual client demand.

 

Say to weigh qualitative corundum brick, we say manage of next brick of light qualitative corundum change target, brick of light qualitative corundum and brick of heavy qualitative corundum detect project somewhat difference, physical function index detects identical, in chemical function index, detect except above project, detect the item with main brick of light qualitative corundum still has coefficient of thermal conductivity: The discretion of coefficient of thermal conductivity is the stand or fall that examines effect of heat preservation of heat insolation of brick of light qualitative corundum, numerical value of coefficient of thermal conductivity is lower, effect of adiabatic heat preservation is better.

 

The use with main brick of light qualitative corundum is adiabatic heat preservation, and the main use of brick of heavy qualitative corundum serves as working layer to be able to resist namely of slaggy solution erode, distinct performance characteristics, detected corundum brick manage changes index project to reach emphasize particularly on somewhat difference.

Manage changes target:

Corundum brick		GY-90	GY-92
Chemical composition %	Al2O3	≥90	≥92
	SiO2	≤3	≤2
	Fe2O3	≤0.3	≤0.2
	CaO	≤1.2	≤1.2
	Na2O	-	-
	ZrO2	-	-
	Cr2O3	-	-
Apparent pore is led (% )		≤18	≤18
System is secret (G/cm3)		≥3.2	≥3.3
Cold intensity of pressure is spent (Mpa)		≥100	≥100
High temperature is fought lose strength (1250 ℃ Mpa)		≥9.5	≥9.5
Fireproof degree (℃ )		≥1850	≥1850
Loading bate temperature (℃ of 0.2Mpa T0.6)		≥1700	≥1680
The heavy change that burn a line is led (％ of 　 of 1600 ℃ ×3h)		≤±0.2	≤±0.2