(1) Lei-a inzawm silicon carbide brick
Clay-bonded silicon carbide brick hi fired refractory products a ni a, silicon carbide atanga siam a ni ber a, leilung hi bonding agent atan hman a ni. Thermal conductivity sang tak, thermal expansion coefficient hniam tak, leh thermal shock leh wear resistance tha tak neia langsar tak takte hian silicon carbide-based brick chi hmasa ber an entir a ni.
Heng brick te hian raw material atan black silicon carbide an hmang a, chemical composition chu: SiC 98.0%, free C 0.5%, Fe 0.2%, leh free SiO2 0.6% te a ni. Lei nem tak, bonding property tha tak nei leh pulp waste liquor te chu binder atan an hmang thin. Historically high proportions of bonding clay (typically 10%–15%) hman a nih laiin, tuna practice hian 3% clay leh 5% pulp waste liquor combination a duh zawk. Brick-a leilung awm tlem zawkte hian leilung tam zawk nei te aiin thermal conductivity a let thum atanga a let li velin a sang zawk a, chubakah load-bearing softening temperature leh slag resistance tha zawk an nei bawk. Brick 3% clay content siamna kawngah hian SiC particle coarse, medium, leh fine te blending hmangin bulk density sang ber neih a ni. Dry mixing uluk tak hnuah leilung chu a dah tel a; minute 3 dang dry mixing hnuah, wet mixing atan pulp waste liquor 4% (density 1.26–1.28 g/cm3) dah a ni. A tui zawng zawng hi 1.5% vel a ni. Darkar 12-a tar hnuah 4 mm sieve hmangin brick press hmangin siam a ni. Green brick te bulk density hi 2.5 atanga 2.7 g/cm3 inkar a ni. Brick te hi ni 2–4 chhung air-dried a ni a, chumi hnuah tunnel kiln ah 1400℃ah an hal a ni.
Heng thilte hi ceramic kiln furniture (batts, supports, leh saggers ang chi), muffle furnace cover, aluminium refining furnace atana linings, zinc distillation furnace atana distillation retorts, leh cement rotary kiln atana cooler siamna atan te hman a ni.
(2) Silicon nitride-bond silicon carbide brick hmanga siam a ni
Silicon nitride-bonded silicon carbide brick hi SiC leh Si powder atanga nitriding leh firing hmanga siam refractory product a ni. An nihna takah chuan silicon nitride (Si3N4) bonding phase an nei a. Si3N4 hi silicon carbide (SiC) grain inkarah acicular (needle-like) emaw fibrous crystal angin a awm a, hei hian advanced refractory material chi pawimawh tak a ni.
Reaction sintering principle hmangin silicon powder awmna SiC green body te chu nitridation reaction hmangin sintered an ni a; firing process chu nitrogen boruak awmna furnace sealed-ah a thleng a, chu chuan control dik tak a siam thei a ni. Furnace temperature, pressure leh atmosphere te chu khauh taka tihfel a ni. Process parameter pawimawh tak takte chu: nitriding gas pressure 0.02–0.04 MPa, furnace boruak oxygen awm zat 0.01% aia hniam, leh final nitridation temperature 1350–1450℃nitridation hun zawng zawng hi a siam chhuah pianzia leh a lian zawng a zirin a inang lo.
Silicon nitride-bonded silicon carbide brick hian alkali erosion do theihna tha tak, molten cryolite hmanga wetting do theihna, oxidation do theihna, wear do theihna, thermal conductivity sang tak, thermal shock do theihna, leh electrical conductivity hniam tak tak a nei a ni.
Heng brick te hi blast furnace hnuai lam shaft atan lining atan hman a ni ber a, traditional refractories aiin a let hnih aia tam service life a pe thei a ni. Tin, aluminum reduction cells tan linings angin an thawk bawk a, ceramic kiln furniture angin-energy savings, extended service life, leh environment friendliness ang chi hlawkna an pe bawk-, tui-cooled blast furnace tuyeres atan sleeve brick atan pawh an hmang bawk.
(3) Silicon Carbide atanga siam chhuah (recrystallized) a ni
Recrystallized silicon carbide products hi silicon carbide raw material atanga siam refractory material a ni a, silicon carbide grain inkara direct bonding a awm tih hriat a ni. Secondary phase a awm loh avangin an danglam a, chu chu 100% -SiC atanga siam vek a ni. Recrystallized silicon carbide siamna atana hman raw materials chemical composition chu hetiang hi a ni: SiC 99.5%, free C 0.2%, Fe 0.08%, leh free SiO2 0.08%.
Recrystallized silicon carbide products hi kiln furniture atan hman a ni ber a, hei hian energy savings, effective kiln volume tihpun, firing cycle tawi, production efficiency tihchangtlun, leh economic returns sang tak tak te a pe a ni. Burner nozzle, ceramic radiant heating tube, leh component protection tube (a bik takin atmosphere furnace-ah) atan pawh an hmang bawk.