For refractory materials, sintering is very important, whether it is natural raw materials, or synthetic raw materials, have to be burned, to sinter before use, fire-retardant refractory products is to achieve the date of sintering. Unshaped refractory materials in the process of gradually sintering.
From a process point of view, sinter is a sturdy, low porosity (almost airless 7L) stone made from a powder at high temperatures.
Refractories degree of flexibility of the signs, usually with the object size reduction (the so-called shrinkage), reduced porosity and bulk density increased to measure.
Sintering is mainly due to the strengthening of refractory material, the inevitable result of increased contact between the particles. Sintering (intrinsic) has the following processes: changes in the shape of the pore size phase; crystal growth, residual stress (suppression) reduction and equilibrium; liquid phase formation; redistribution of phase space; In many cases, sintering accompanied by multi-phase transformation of certain phases, solid-phase chemical reactions or liquid-phase reactions. The reaction forms a new phase and a solid melt.
The final cooling complicates the enumeration process, with some of the opposite processes occurring. Multi-product changes, melt crystallization and crystallization pressure may occur, the formation of the glass phase and other phenomena. Like the lower temperature drop, the refractory material produces stress and often produces macroscopic defects so that the refractory products are discarded. Temperature gradients, temperature change rates, phase and concentration gradients, atmospheres, high frequency field effects, vibrations and other conditions in a refractory body all depend on the temperature. Even within the refractory material. y1 its temperature changes have a very complex phenomenon, can not fully enumerate the occurrence of the process
Technical Data Sheet Of Accoset-50 ALUMINA MORTAR (Test Certificate) General Properties A. Max service temperature - 1500 oC B. Maximum grain size - 0 - 1.5 mm C. Water required for mixing - 22 - 30% D. Setting - Airsetting E. Sintering Temp - 1550 oC Chemical Properties A. Al2O3 - 50.00% B. SiO2 - 31.00% c. Fe2O3 - 5.00% D. LOI - 7.00% Physical Properties A. Dry Density - kg / m3 B. CCS - 17 kg / cm2 after drying at 110C / 24 hr C. MOR - 20 kg / cm2 at 110 oC/ 24 hr 18 kg/cm2 at 800 C/ 3 hr Thermal Properties - A. Refractoriness ( Orton / C) - 31.5 orton cone/1699 oC Packaging - 25 - 50 kg bags Storage Life - 12 months Delivery State - Dry
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Application: Carbon bricks are widely used in variety heating environment. There are blast furnace carbon bricks, electric furnace carbon bricks, calcium carbide furnace carbon bricks, aluminum electrolytic cell cathode carbon blocks(semi graphite cathode carbon blocks) ,etc. Advantages: High refractoriness and high refractoriness under load. Good thermal shock resistance. Good resistance to molten slag or iron liquid impregnation. Excellent resistance to various kinds of salts and organic materials corrosion. Strong slag erosion resistance, good high hot volume stability. High mechanical strength, good abrasion resistance. Excellent thermal conductivity.
Mullite refractory castable general use of mullite aggregate to as raw materials and configuration of a kind of low temperature in the insulation refractories, it is commonly used in the petrochemical industry tube furnace, light diesel oil, ethane cracking furnace lining, atmospheric and vacuum furnace and sulfur recovery device and steam boiler, tortoiseshell net heat insulation layer, two barrel and pipe insulation monolayer, and other industrial furnace door, see the fire hole, observation hole door lining, etc. The advantage of mullite refractory castable is that its refractory temperature is higher than other thermal insulation castable, which can be directly in contact with the flame and used as the lining of the kiln. Another kind of refractory castable is corundum mullite castable, which is a refractory castable prepared with corundum as aggregate and powder plus some binder.It has higher mechanical strength and abrasion resistance than high alumina refractory and Mullite refractory, but less thermal shock resistance.
Steel fiber castable is widely used in high temperature vulnerable parts of metallurgy, building materials and circulating fluidized bed boilers.As follows: according to the classification of the material, it is suitable for planning the corundum quality before and after the steel fiber reinforced castable first used in large cement kiln kiln and other industrial kiln lining, high aluminum and corundum mullite stone steel fiber reinforced refractory castable first used in the cement kiln kiln mouth, wicket cover, before and after cooling machine in high temperature resistant parts and other industrial kiln liner.
