Light qualitative Molaishi mechanical function of the brick by Al
2
O
3
/ SiO
2
than mixing microstructure decides, especially Al
2
O
3
Content is the Mo Laishi brick of 68% , when 1300 ℃ bending strength amounts to 570MPa, rupture tenacity K
Ic
Amount to 5.7MPa.Nm, when all comparing normal temperature 1.6 times taller, this kind along with temperature elevatory, intensity and tenacity do not rise substantially instead damply not only, outside SiC is divided in material of existing high temperature pottery and porcelain, it is peerless, this also is to pledge Mo Laishi brick regards high temperature material as admirable character gently.
With agglomeration or electric frit Molaishi is the firebrick that main raw material makes, can use Molaishi entirely, also can use Molaishi partly, the part uses corundum to be raw material. Former call Mo Laishi firebrick, latter calls corundum to not come stone firebrick or corundum Mo Laishi brick. The manufacturing technological process of Mo Laishi firebrick and tall aluminous brick are identical, burden classics batch mixing, shape, dry with firing wait for a few working procedure. Firing the purity of temperature and burden composition, raw material and the requirement to firebrick function are concerned, it is 1500 ～ normally 1700 ℃ . The brick has Mo Laishi firebrick and corundum Mo Laishi creep of tall, high temperature leads loading bate temperature sex of low, heatproof shake is good wait for an advantage, apply extensively at kiln of frit of blast furnace hot-blast stove, glass, dry extinguish anxious reach heating furnace to wait for industrial furnace on kiln. Mo Laishi is fireproof firebrick is eroded easily below high temperature by alkalescent firebrick. In addition, below high temperature, mo Laishi can generate Al2O3 by reaction with vapor and be damaged. Accordingly, mo Laishi firebrick is unfavorable the environment that reachs Gao Shuizheng to enrage content in tall basic slag falls to be used for a long time. Outside the compound and fireproof firebrick that forms besides Molaishi and it and corundum, mo Laishi is OK still form firebrick with other data in order to improve its performance, firebrick of the Mo Laishi that be like zirconium, Molaishi one carborundum firebrick. Firebrick of alleged zirconium Mo Laishi is Molaishi one zirconia composite material. But because zirconia price is high, in actual production middling passes Al2O3 or alumina and zirconium stone reaction make grog of the Mo Laishi that get zirconium or firebrick.
The production method of this kind of firebrick and raw material includes electric frit law and agglomeration method. The aluminous zirconium silicon that makes with electric founding (we are in AZS) firebrick already discussed in brick of corundum of electric frit zirconium. Make Al2O3 and ZrSiO4 burden to calcine grog of the Mo Laishi that get zirconium, again its broken, mix practice, shape with firing make firebrick of the Mo Laishi that get zirconium, namely agglomeration AZS brick.
When use alumina is raw material, the commonnest is the heatproof shake sex that in introducing ZrSiO4 tall aluminous brick, will raise tall aluminous brick, namely so called “ is fought flake ” of tall aluminous brick. The ZrO2 that generates through reaction is dispersedly in Molaishi and corundum. Because ZrO2 is heating to change with the photograph in cooling process, it is all round ZrO2 grain generation micro-crack, raise its to fight thermal shock sex thereby. Agglomeration AZS firebrick is commonly used in vitreous kiln.
A kind anti-corrosive Mo Laishi firebrick, those who include firebrick matrix and spray to narrate firebrick matrix surface in place is high temperature resistant coating; Among them, the preparation raw material that narrates firebrick matrix includes: Mo Laishi big grain 27% ～ 31% , hollow glass is small bead 15% ～ 25% , earth of mountain of on the high side exceeds fine pink 3% ～ 5% , titanium whitening 10% ～ 18% , polyvinyl alcohol aqueous solution 0.5% ～ 1.5% , 5% ～ of fly ash 10% , diatomite 5% : Get together silicon oxygen alkyl 20% ～ 35% , get together alkyl of boracic silicon nitrogen 30% ～ 38% , Mo pink 3% ～ 10% , surplus is alcohol. What narrate diameter of bead of Mo Laishi big grain to be 3 Mm of 1 Mm ～ , place to narrate hollow glass small bead bead diameter is 1 Mm of 0.5 Mm ～ . What narrate earth of mountain of on the high side to exceed fine pink granuality to be less than 0.043mm, place to narrate diatomite granuality to be less than 0.074mm.
According to the raw material computation of afore-mentioned quality percentage, mo Laishi big grain, will hollow glass is small bead, earth of mountain of on the high side exceeds aqueous solution of fine pink, titanium white pink, polyvinyl alcohol, fly ash, diatomite, calcium carbonate and pulp water to undertake mixing grinding making getting prefab pug, state place mix grind pug to squelch adobe is dry;
Will get together silicon oxygen alkyl, get together pink of alkyl of boracic silicon nitrogen, Mo and alcohol are made high temperature resistant coating, next will dry the place after narrates place of adobe surface spray high temperature resistant coating, make spray adobe, what narrate spray adobe to be made so that what narrate via dry, to calcine hind anti-corrosive Mo Laishi firebrick.
Be based on afore-mentioned, state place mix grind pug suppress to become adobe, state place adobe to be in natural and dry inside oast of the park after 24 hours, in 100 ℃ ～ the temperature condition of 200 ℃ falls dry 24 hours of ～ 48 hours; Next will dry the place after narrates adobe macerate in place high temperature resistant make in coating spray adobe, be in 1100 ℃ ～ undertake to calcine 8 hours to its below the temperature of 1250 ℃ ～ 10 hours, make so that what narrate thereby anti-corrosive Mo Laishi firebrick.
The function action of each composition in raw material of firebrick of light qualitative Mo Laishi is as follows:
Mo Laishi big grain: It is the mineral be called by a joint name that a series of aluminous silicate form, have high temperature resistant, strength tall coefficient of thermal conductivity is small, energy-saving effect is distinct wait for a characteristic, apply to kiln of crucible of kiln of drawer of porcelain of kiln of path of roller of hot-blast stove of furnace of oil splitting decomposition, metallurgy, pottery and porcelain, channel kiln, report, glass and the liner of all sorts of electric stove, can contact blaze directly.
Andalusite: Crystal belongs to orthogonality (inclined square) the silicate of insular shape structure that brilliant fastens is mineral, andalusite can produce not reversible crystal to change in process of adobe to calcine form the Molaishi that has good Mo Laishi network, make its have the fireproof property of 1800 ℃ above thereby, and be able to bear or endure suddenly cold suddenly big, heatproof wallop mixes hot, mechanical strength strong, loading changes the sex that fight broken bits the point is high, have extremely tall chemistry stability and extremely strong fight chemistry caustic, make thereby the place of preparation narrates low creep andalusite compound firebrick has Gao He to fight thermal shock function soft, low creep, high.
Earth of mountain of on the high side exceeds fine pink: Earth of mountain of on the high side is the silica aluminium that kaolin forms in the dehydrate below proper temperature. It is irregular that the atom in earth of mountain of on the high side arranges order, present thermodynamic metastable position, arousing next having appropriately gel sex. Rise when temperature to crystallization begins to generate Molaishi and Fang Shiying when 925 ℃ . Crystal is main by silicon oxygen tetrahedral comprise with oxyhydrogen octahedron, among them silicon oxygen is tetrahedral with common the means of vertex angle connects along 2 dimension direction the reseau layer that forms 6 to arrange. Kaolin has good insulating property and strong acid-proof performance, taller fireproof property, fireproof composition concerns degree of chemistry with kaolin, of pure kaolin fireproof degree control in 1700 ℃ commonly, when Shui Yun's mother, feldspathic content much, when content of potassium, natrium, iron is high, fireproof degree reduce, of earth of mountain of on the high side fireproof spend lowest to not be less than 1500 ℃ .
Titanium white pink: Bases is titanium dioxide, chemistry is very stable, it is one kind slants acidity bisexual oxide, use extensively at coating of surface of of all kinds structure, paper coating and filling, plastic reach flexibility. Its basically regard agglomeration as auxiliary in the article, drop the firing temperature of firebrick.
Diatomite: Diatomite is qualitative rock of a kind of silicon, the cliff of silicon qualitative deposit that is cause of formation of a kind of biology, it basically is comprised by the remains place of archaic diatom. Its chemistry composition is given priority to with SiO2. On industry commonly used will serve as insulation material. Because have porosity,strong, chemistry stabilizes big, absorbency, the characteristic such as wear-resisting, heat-resisting, can provide superior exterior performance for coating, add a look, add stiff and enhance adherent power.
Calcium carbonate: Calcium carbonate is a kind of inorganic compound, common says: Pink of grey stone, limestone, stone. Calcium carbonate and polyvinyl alcohol aqueous solution basically are used to be used as the agent that make hole and agglomeration auxiliary in the article.
Get together silicon oxygen alkyl, get together alkyl of boracic silicon nitrogen and Mo pink issue reaction of meeting splitting decomposition to make the new appearance such as Mo2C, Mo3Si in high temperature condition, form coating of pottery and porcelain of SiOC of the condition that be not brilliant, the appearance that improved firebrick is fought corrode ability, the bulk of generation expands the hole rate that can lower firebrick surface effectively.
This invention has outstanding materiality characteristic and striking progress relative to existing technology, say specificly, the Mo Laishi big grain that this invention reachs distinct size length above all, hollow glass is small bead, earth of mountain of on the high side exceeds aqueous solution of fine pink, titanium white pink, polyvinyl alcohol, fly ash, diatomite, calcium carbonate and pulp water to undertake mixture, make each place composition match the adobe of preparation to agree than collocation, those who assured to calcine earning is anti-corrosive Mo Laishi firebrick the consistency of each position performance, the granuality that a large number of edges and corners contain to highlight in raw material at the same time expects, increased critical size, for anti-corrosive Mo Laishi firebrick offerred firm framework structure to make its are in use process not easy generation is out of shape. This invention states place adobe spray by get together alkyl of boracic silicon nitrogen, get together what pink of silicon oxygen alkyl, Mo and ethanol blend preparation is high temperature resistant in coating, make the adobe surface after fire forms high temperature resistant layer of pottery and porcelain, those who promoted a product is high temperature resistant with exterior corrosion resistance can.
In the meantime, this invention makes full use of polyvinyl alcohol aqueous solution mixes with afore-mentioned raw material, make data inside exist inside much time a large number of small air hole, and what narrate small air hole to won't follow agglomeration course undertake and gather grown, micron rank is formed finally in the product and the stoma that distributings equably, make of preparation anti-corrosive Mo Laishi firebrick has Gao He to fight thermal shock function soft, low creep, high.
Particular executive kind
This executive exemple offers a kind anti-corrosive Mo Laishi firebrick, those who include firebrick matrix and spray to narrate firebrick matrix surface in place is high temperature resistant coating; Among them, the preparation raw material that narrates firebrick matrix includes: Mo Laishi big grain 31% , hollow glass is small bead 18% , earth of mountain of on the high side exceeds fine pink 5% , titanium white pink 13% , polyvinyl alcohol aqueous solution 0.5% , fly ash 10% , diatomite 5.5% , calcium carbonate 6% , pulp water 11% . Be narrated high temperature resistant the preparation raw material of coating includes: Get together silicon oxygen alkyl 35% , Mo pink 10% , get together alkyl of boracic silicon nitrogen 33% , alcohol 22% .
Among them, what narrate diameter of bead of Mo Laishi big grain to be 3 Mm of 1 Mm ～ , place to narrate hollow glass small bead bead diameter narrates earth of mountain of on the high side to exceed fine pink granuality to be less than 0.043mm, place to narrate diatomite granuality to be less than 0.074mm for 1 Mm of 0.5 Mm ～ , place. If the chemical composition in each raw material expresses 1 to show.
This executive exemple still offers a kind of place to narrate anti-corrosive the preparation method of Mo Laishi firebrick, specific preparation measure includes:
(1) calculate according to the raw material of afore-mentioned quality percentage, mo Laishi big grain, will hollow glass is small bead, earth of mountain of on the high side exceeds aqueous solution of fine pink, titanium white pink, polyvinyl alcohol, fly ash, diatomite, calcium carbonate and pulp water to undertake mixing grinding making getting prefab pug; Will get together pink of Mo of silicon oxygen alkyl and alcohol are made high temperature resistant coating;
(2) the machine making a brick that uses pressure tonnage to be more than 315 tons states place mix grind pug suppress to become adobe, state place adobe to be in natural and dry 24 hours, next inside park oast, dry below the temperature condition of 200 ℃ 24 hours; Next will dry the adobe macerate after is narrated in place high temperature resistant make in coating spray adobe, fall to undertake to calcine 8 hours to its in the temperature of 1250 ℃ , make so that what narrate thereby anti-corrosive Mo Laishi firebrick. Via detecting, the place that this executive exemple makes is narrated anti-corrosive density of Mo Laishi firebrick is 1.9g/cm3
The method is same. Via detecting, the place that this executive exemple makes is narrated anti-corrosive density of Mo Laishi firebrick is 2.1g/cm3.
Because fireproof material is right high temperature medium fights aggressivity goodly, and the property that has heat preservation heat insulation, be used extensively in the high temperature industry such as metallurgy, petrifaction, glass. Be opposite as our country energy-saving fall the heavy visual range of bad news is spent rise ceaselessly, the light simple fireproof stuff that has effect of heat insolation of good heat preservation got more research and development. Indeterminate form is fireproof because material has construction cost of convenience, production is low, and the integral structure sex of line system is good wait for an advantage, and got pay close attention to particularly, among them blame with fireproof and pouring makings application is gotten most extensive.
Existing firebrick is viscid and adiabatic firebrick mostly, argillaceous brick basically is mixed by photograph of Molaishi, glass Fang Shiying and quartz are comprised. It is raw material with horniness clay normally, beforehand to calcine becomes clinker, match next with soft qualitative clay, with working a way partly may model law shapes, temperature is in 1400 ℃ of 1300 ℃ ～ are firing argillaceous brick goods. Also can add a few the bond such as water glass, cement is made do not burn goods and indeterminate form material. Still have service life of this kind of firebrick short, cannot recycle. Additional, because traditional fireproof aggregate is medium stomatic size is larger, bore diameter is in millimeter class more, use in high temperature environment when this material so when, because pass radiate of the gas inside air hole to conduct heat to pass hot aggravate with convection, can make the coefficient of thermal conductivity of fireproof material elevatory, reduced the effect of adiabatic heat preservation of fireproof material then, increased the prediction of a person's luck in a given year of heat energy, bring about the rise of energy cost.
|
Product name |
Light qualitative Molaishi brick |
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|
Classify temperature (℃ ) |
1260 |
1430 |
1540 |
1650 |
1760 |
|
Product code |
JM-23 |
JM-26 |
JM-28 |
JM-30 |
JM-32 |
|
Academic bulk density (Kg/m3) |
800 |
800 |
900 |
1000 |
1100 |
|
Heavy hot line changes (% ) |
1280 ℃ X3h, ≤0.6 |
1380 ℃ X3h, ≤0.6 |
1500 ℃ X3h, ≤0.6 |
1550 ℃ X3h, ≤0.6 |
1570 ℃ X3h, ≤0.6 |
|
Intensity of cold conditions compression (Mpa) |
1.8 |
2.4 |
3.0 |
3.6 |
4.6 |
|
Heat expands (1000 ℃ ) % |
0.5 |
0.5 |
0.55 |
0.58 |
0.60 |
|
Academic coefficient of thermal conductivity |
0.21 |
0.25 |
0.28 |
0.33 |
0.40 |
|
AL2O3 |
40 |
50 |
62 |
70 |
79 |
|
Fe2O3 |
≤1.0 |
≤1.0 |
≤0.8 |
≤0.6 |
≤0.5 |
|
Product measure |
230x114x65 of commonly used norms; Other standards basis asks to have something made to order |
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