The chemical composition of fireproof material is to point to the compound that makes fireproof material, also weigh chemical composition. Generally speaking, different fireproof material has different chemical part, and fireproof material presses avery kind of how much can the content of each composition divide into two parts again, one part is the main part that takes absolute majority, another part is to occupy a few foreign matter composition. In fireproof material, the composition that normally need determines has Al2O3, Si02, Fe203, CaO, MgO, Ti02, Na20, K2O to wait, fireproof to containing carbon material and carborundum are fireproof for material, carbon and carborundum also are important chemical composition.
Fireproof material basically uses indeterminate form at the appearance inside kiln of new-style cement working a way irregular or the position that kiln body produces hydrocarbon form, coal of head of end of the warm-up system that resembles rotary kiln, kiln, kiln, gush is in charge of, tertiary air canal, cooling machine reachs more than heat to generate electricity etc.
Indeterminate form is fireproof material breed is various, there is different choice below different condition: The key of fireproof material has errant look at 3 o'clock:
One of, tie kind;
Secondly, content of interior of content of the cementation after warming up, cementation by cementation content between, by cementation react daedally between fireproof material;
Thirdly, indeterminate form is gas of fireproof material and kiln makings, kiln, anchorage between body of firmware, kiln more mixed physico-chemical effect.
The combinative means that fireproof material uses has a few kinds:
(Have the aid of of —— of union of 1) to hydrate issues bond and water happening to hydrate to reaction makes to hydrate product and produce tie at normal temperature. If aluminous acerbity calcic cement adds water happening water to change reaction to generate 6 a shape or acicular CaO•A12O3•10H2O, 2CaOz•Al2O3•8H2O and crystal of cubic and graininess 3CaO•Al2O3•6H2O and alumina gel, form agglomeration crystallization network and produce tie.
(2) chemistry combines —— have the aid of at bond and stiffening agent, or chemical reaction produces below normal temperature between bond and fireproof material, or chemical reaction happens to make the compound that has bond effect when heating and generation is united in wedlock.
(3) polymerization combines —— have the aid of at adding activator or cross-linking agent, consociate agent happens to condensation polymerization forms network shape structure and generate combinative strength. If colophony of armour rank phenolic aldehyde adds,following condensation polymerization can arise to react when acid makes activator or heating and generate better union strength:
(4) pottery and porcelain combines —— department to show microtherm agglomeration is united in wedlock, coming loose namely shape joins the auxiliary that can drop firing temperature or metallic powder in fireproof material, with dropping fluid photograph occurrence temperature greatly, one fluid originallies to react below stimulative low temperature and produce microtherm agglomeration tie. If corundum pledges dry type shakes,join in makings a few boracic anhydride, is boracic anhydride in 450? 550 ℃ make agglutinant fluid appearance, with α-Al2O3 happening fluid subsequently one solid reaction generates the compound 2A12O3•B2O3(that has taller melt temperature abhorrent melt temperature is 1035 ℃ , temperature of 9A12O3•2B2O3(abhorrent melt is 1950 ℃ ) and corundum aggregate solid writtens guarantee together.
(5) adhesion union (conglutinate) —— is at one of action of following a few kinds of physics generation union of have the aid of.
1) physisorption action: The Fan Dehua force of interaction force —— between support member and generation is united in wedlock;
2) diffuses action: Below the action that heats up motion in corporeal element, binder and be happened to diffuse each other by the element of felt content action, form diffusion layer, form firm union thereby;
3) electrostatic action: Binder and be being existed by the interface of felt content electric double layer, by the electrostatic gravitation action of electric double layer generation is united in wedlock.
The bond majority that produces adhesion tie is organic bond, among them some is provisionality bond, the meeting after classics high temperature is handled burns, if dextrin, carboxyl is methylic cellulose. Some is permanent bond, outside partial volatile is being divided after classics high temperature is handled, the meeting carbonization of the others and form carbolic union, wait for organic bond like colophony of bitumen, phenolic aldehyde. Also a few inorganic bond have agglutinate effect, be like phosphoric acid collosol of 2 hydrogen aluminium, water glass, silicon.
(Support of —— of 6) agglomeration union joins flocculating agent to make small particle (colloid particle) produce agglomeration and produce tie.
Union is indeterminate form the matrix of fireproof material is different, generation sticks the master piece outside receive and having resistance between matrix and aggregate with infrangible ability, usually, the union of fireproof material divides indeterminate form to tie 3 kinds of kind for cement union, chemical union, agglomeration.
One, the union that cement union is generation of support cement to hydrate, to hydrate is solid state material and water reaction, form solid state the chemical reaction of hydrous material.
2, chemical union is the union that relies on bond happening chemistry to react, but, these chemical reaction do not include but the reaction of to hydrate material and water, do not give priority to with to hydrate at least, otherwise, answer range to hydrate is united in wedlock.
3, agglomeration union points to coagulate by small pink the couple that takes generation.
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