The stomatic classification porosity in firebrick is to show firebrick place contains the per cent of total volume of stomatic bulk and product. Expert of fireproof material factory introduces Henan, the stomatic cent in firebrick is two kinds: The stoma that closes to not be interlinked with the outside in firebrick weighs closed pore; Be interlinked with the outside, the stoma that can be fluid fill weighs open pore. In open pore, perforative goods two sides, the stoma that can pass for the fluid calls be well versed in air hole again. Combine firebrick to differ somewhat with blast tuyere with blast furnace, of total volume of open pore bulk and product lead than calling open pore, often say apparent pore is led, write down Pa, of total volume of closed pore bulk and product lead than calling closed pore, write down Pc; The truer than calling porosity of total volume of total stomatic volume and product, write down Pt. 3 person the relation is: Pt=pa+pc. Be united in wedlock except founding goods, bitumen or dipped article and partial heat insolation are fireproof outside goods, the stomatic great majority in general firebrick is open pore. Be hard to determine directly because of closed pore bulk again, the porosity index of goods expresses with apparent pore rate normally. The apparent pore rate of firebrick is OK small to adjacent 0 or arrive greatly 80 ％ . The apparent pore rate of general and compact product is in 28 ％ of 10 ％ ～ , be less than 15 ％ call low porosity goods. The true porosity of heat-insulating material is more than 45 ％ . Porosity is the basic technology index of most and fireproof material. Its size affects all performance of refractory products almost, especially the intensity, thermal conductance, sex that fight broken bits and heatproof shake sex. Porosity increases, intensity drops, this is not only be reduced as a result of solid cut area and bring about real stress to increase, mainer is air hole is the blemish in material, can cause stress to center and make intensity drops. The effect of bulky stoma is more distinct. Because air itself thermal conductance is extremely low, porosity increases can reduce thermal conductance significantly. Big porosity makes broken bits right of goods permeate increase, or containing carbon make in fireproof material the oxidation aggravate of carbolic element, and make the sex fighting broken bits of material is reduced significantly. Because porosity is right coefficient of intensity, work to break, thermal conductance, linear expansion, stretch model measures the mixed effect that wait, and the effect that makes its antagonism heats up shake sex is relatively mixed also. Numerous goods porosity is beautiful in the heatproof shake sex when some limits. Reduce porosity the loading bate temperature of fireproof to rising material, sex of high temperature creep also is advantageous. The stoma in refractory products is be entered by belt of raw material itself and be in shape, dry reach firing form in the process. It distributings to reach grain and matrix in grain, matrix between. It is reported, different fireproof material has particular demand to the size of porosity. Produce the compact product of low porosity, wanting a condition is the raw material that chooses low porosity. According to principle of close together accumulation, use reasonable grain grading, reasonable use bond, mix practice adequately equably, high pressure shapes and carry high fever to be mixed into temperature appropriately extending heat preservation time is the important step that porosity drops in production of compact and fireproof material. Be in compact and pouring in makings production, add in burden exceed fine pink and dispersive agent, can form more close together accumulation, and the product that acquires low porosity. In asking the adiabatic and refractory products of tall porosity is produced, use heat-insulating material raw material, chemical and epispastic or in stoma of the generation after combustible is being joined to burn in burden grow in quantity is stomatic. The bulk density user of firebrick is when firebrick of choose and buy, what can a few manage change target is referenced, and the manage of firebrick changes index to have a lot of, and one of referenced index that bulk density is firebrick of user choose and buy, it also is very important target information, the bulk density that we elaborate next firebrick today introduces the bulk density of common firebrick. One, the system of bulk density abbreviation of firebrick of bulk density definition is secret, the dry quality that it is firebrick is as overall as its accumulate (the volume total of solid, open pore and closed pore) ratio, namely the quality of firebrick unit volume, state the method is G/cm3 or Kg/m3. The bulk density of firebrick is the compact degree of token firebrick, it is one of main index in standard of all firebrick quality. The bulk density of firebrick is right other a lot of function have distinct effect, like porosity, intensity, fight temperature of bate of aggressivity, loading, wearability and heatproof shake sex to wait, to light qualitative firebrick, bulk density and thermal conductivity, thermal capacity also is having close relationship. Generally speaking, the bulk density of firebrick is higher, it is the intensity of firebrick, better to fight aggressivity, wearability. 2, the bulk density of the factor that affects firebrick bulk density and note firebrick, get the influence that uses the ingredient such as technology of raw material, production, the pressure of adobe of middling pressure of the density of raw material bulk that when accordingly control makes firebrick, uses, process that make, make and control is reasonable firing system, all can be controlled effectively firing the bulk density of firebrick. 3, of firebrick bulk density detect method 1, detect to the bulk density of compact firebrick use ISO5017:1 according to equivalent of national level GB/T2997-2000(998) undertakes determining 2, use ISO5016:1 according to equivalent of national level GB/T2998-2001(to the bulk density of light qualitative firebrick997) undertakes determining, computational formula is as follows: In Db=m/Vb type, BD -- the bulk density of sample, g/cm3(kg/m3) . M -- the quality of dry sample, g;Vb -- the total volume of sample, vb=Lbd(L, B, D is the length of sample, width and ply) respectively, cm3. 4, the bulk density of common firebrick
Firebrick 3 large part usually, according to the content of all sorts of chemical composition in firebrick and its action, it cent gives priority to foreign matter and composition, extra part 3 kinds. In firebrick advocate part takes great majority, have the chemical part of decisive action to property of material high temperature. Firebrick has the property of action of very good counteractive high temperature, and a lot of fireproof material have character each again, complete or basically depend on advocate composition. So, to fireproof material advocate composition, give take seriously adequately. Normally, comprise classification according to chemistry to fireproof material, and differentiate to a lot of fireproof material that pledge with material for a certain number of grade, it is or it is a basis likely its advocate the sort of composition and its content amount and decide. Can serve as fireproof material advocate of composition is to have very tall crystal lattice can Gao Rong is nodded or decompose the simple substance with very high temperature or compound. In firebrick advocate composition is to point to those who hold great majority, have the chemical part of decisive action to property of material high temperature. Why can firebrick have the property of function of good counteractive high temperature, and do a lot of fireproof material have character each again? Complete or basically mix according to the content of all sorts of chemical composition in fireproof material its action, its normally cent gives priority to foreign matter and composition, extra part 3 sort. Foreign matter is to point to be different from in fireproof material advocate of composition, content is fractional and what often bring a harm to the property of counteractive high temperature of firebrick is chemical composition. This kind of chemical composition is more by contain advocate the carry secretly in the raw material of composition and come. Manage of type of firebrick of your crop, need changes the price need basis of firebrick the element such as index will decide to use which firebrick of a variety of model, ability will fix the price of firebrick. Fireproof material occurrence craze, fall off, easy how to wear away to do? Want to solve a problem thoroughly, need to be dug from germ, the analysis gives real reason, flourish Cheng Naicai is engaged in be able to bear or endure service of timber production, research and development is old, can solve all sorts of difficulty problems of liner of furnace of high temperature kiln, welcome broad new old friend to seek advice reach technical communication.
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