The heatproof shake sex of firebrick namely the ability that firebrick influences the resistance below the condition to injure in temperature urgent revulsion, can add a few kinds mineral will promote heatproof shake capability.
Can be the thermal shock injury of firebrick divided for two kinds of: ?
The heat-resisting shake sex of the firebrick of heatproof shake sex of firebrick is firebrick the ability that in temperature the resistance below rapid change condition injures. Ever called stability of thermal stability, thermal shock, heat-resisting to pound a gender, be able to bear or endure lukewarm leap sex, be able to bear or endure cold hot sex. Firebrick is microtherm and in lukewarm the brittleness material below, lack extends a gender. In the use of hot project facilities, firebrick often undergoes rapid temperature change, cause damage. Heat-resisting shake sex is one of important performance characteristics of firebrick function. The heat-resisting shake sex of firebrick is his the integral performance that mechanical function and heat function issue in temperature change condition. The fast temperature change that firebrick undergoes calls thermal shock. The new crackle that firebrick produces in thermal shock, and new crackle and former crackle are patulous the craze that cause, flake and rupture, call the thermal shock injury of firebrick. Thermal shock injures the result that is thermal stress. When firebrick temperature changes, restrain be out of shape the stress of generation is thermal stress. If of firebrick change produces when burning a line to change in different and polyphase temperature again, the heat of firebrick expands to be able to produce thermal stress when even action mixes temperature gradient to change. The stretch model quantity of thermal stress and firebrick and flexibility should become direct ratio, and the product that the stretch model of firebrick measures meet an emergency to be equal to linear expansion coefficient and temperature change.
Cyanite is mineral raw material (the heatproof performance that can improve a product, be able to bear or endure urgent cold heat) the basic mixture that provides handicraft of fireproof insulation material, add plant seed, chemical fibber and synthetic fibre. Mix well-balanced hind, obtain the mixture before shaping, join intermixture or mix glue, put grind in providing, shape. After airing, can obtain handicraft of fireproof insulation material through high temperature fire only.
How to raise the heatproof shake sex of aluminous brick? With grog of one class alumina and electric frit Baigang jade pink is raw material, join right amount expander, mix via shaping 800 ℃ heat treatment, can make good into thermal shock stability tall aluminous brick. The chemical composition of grog of one class alumina is (%):AL2O383.50, SiO29.39, Fe2O31.29, K2O+Na2O0.86. Al2O3 content is 95.36% . Does slimy bead deserve to compare: ? Suffer from?5~35% of boil in water for a while of the Lao that fight , 20~40% of fine pink of one class alumina, 5~10% of pink of electric frit white corundum, andalusite and silicon line Shi Fu add up to expander 6~15% , chemical bond 6~10% . Mixture practice has in mixture exercise machine. Add the chemical bond of 50% in thick bead above all, mixture 3~5min, add fine pink, compound expander and other and chemical bond next. Slop granuality is as follows: 5~3mm18.4% , 3~1mm26.7% , 1~0.5mm3.5% , 0.5~0.1mm8.2% , 0.1mm43.2% , moisture 3% , strand makings 2h above. Adobe presses a brick in 300t attrition shape on machine, bulk density is more than 2.85g/cm3. Adobe is after 160 ℃ are dry, in kiln pouring blaze 800 ℃ fall have heat treatment. The manage of this kind of tall aluminous brick changes index to be as follows: Al2O377.01% , siO213.71% , apparent pore is led 20.4% , load bate temperature 1530 ℃ , intensity of normal temperature compression, the heavy change that burn a line leads 1500 ℃ 2h + 3.7% . Thermal shock stability (1100 ℃ , water-cooling) be more than 10 times. This brick is used at coping of 5t electric stove, without flake and fall off.
What is the method that increases stability of firebrick thermal shock? In addition, the purpose of 3 stone is to use its to change in the photograph below high temperature the constituent structure that changeover will come to improve handicraft and microstructure, the creep character that uses material of answer photograph modified and micro-crack to add principle of pliable but strong to improve tall aluminous brick and thermal shock are characteristic. Its effect analysis gives out: 1. Because 3 stone produce Molaishi to convert reaction below high temperature, bulk violent wind rises, its crystal undertakes on all grain. In the whole process of the fire that make a brick, the node of 3 stone is changed in its a lot of subtle break were created all round grain, the existence of small break raised raw material to heat up the dependability of the layer. The test specimen after observing 1300 ℃ wind is cold 56 times, have subtle beehive grain only, a few test specimen were not dropped piece, enough shows the effect of 3 stone. 2. 3 stone cannot go against translate into Mo Laishi, raised the mineral water content with advantageous handicraft, improved the constituent structure of handicraft. The Mo Laishi crystal of the generation after changing is parallel appearance of Yu Yuanjing substance, maintained original sort method. Below high temperature load, but reasonable restrain product group to slide, be helpful for raising the creep character of handicraft. 3. In the whole process of to calcine, a few stone had been changed. Below high temperature action, the 3 stone that did not change can be mirrorred for many times continuously not come petrifaction, bring about continuously violent wind rises, can compensate what high temperature load falls to decrease, the creep that raises handicraft in the round is characteristic.
Raise the method of stability of thermal shock of magnesian chromic fireproof material. Because the intermittence of converter runs character, the thermal shock stability of fireproof to magnesian chromium material raised strict requirement. To raise the heat-resisting shake sex of fireproof material, can expand through avoiding flaw, use up crackle patulous power, increase material to rupture exterior energy, increase plasticity, reduce linear expansion coefficient, increase heat conduction rate to come true. (1) appropriate hole rate. Exterior crackle won't be caused instantly rupture, serious is in-house thermal stress cause flake and rupture. When hole rate increases appropriately, below thermal shock action, product interior crack length shortens, the amount increases, crackle mutual crisscross, web shape. Accordingly, the product ruptures what need rupture can increase, can increase the thermal shock stability of the product effectively. The optimal hole rate of fireproof product is controlled normally in 13%20% . (2) controls the grain grading of raw material, the option is low expand, the raw material of tall heat conduction. To obtain magnesian chromic fireproof data, have good thermal shock stability, need increases the size of critical grain, reduce the fine pink content in chromic mine grain. Use the raw material with linear expansion little coefficient, and the raw material with the tall coefficient of thermal conductivity such as Cu2O. (3) increase fine crackle, form reticulate structure. Use the characteristic with fireproof product grain and abhorrent coefficient of matrix linear expansion and the bulk effect that change, fine crackle arises in the product, to resisting the product is disastrous destroy (heat flakes or rupture) have distinct effect. The experiment proves, most or most Zr02 is added to be able to increase the thermal shock stability of magnesian chromic material significantly in magnesian chromic fireproof material. Compare with sample cut photograph, the sample interior that joins Zro2 has a large number of fine flaw. As a result of the existence of these fine crackle, they drew the energy with patulous crackle, increased the thermal shock stability of sample thereby, but add a quantity to should not exceed 5% .