Dry Vibration Cements
Dry cements are predominantly used for induction furnaces but may also be used for reverberatory furnaces, forehearths, ladles, etc. Various formulations are available to accommodate both ferrous and non-ferrous alloys but all vibration cements may be installed using the same basic techniques.
All dry vibration mixes are supplied in polyethylene lined bags or bulk stacks so that the material can be readily delivered into the working area. Compaction of the cement powder is accomplished using a hand-held main frequency tamper such as the Bosch type 18900 vibrating rammer. The curing or sintering process serves to develop the hard, impervious, heat-setting bond which may be achieved over a wide range of maturing and operating temperatures to accommodate different alloys and start-up procedures.
Additional Ceramic Products
Coil Grouts
Coil grout is used in coreless furnaces to protect the coil from molten metal penetration. It also provides some insulating properties. It is composed of alumina or silica and can withstand temperatures up to 3000° F.
Ceramic Bonding Agents
Topping, patching, and priming/bonding cements are a family of complementary compositions of either alumina, magnesia or spine! designed for use with the various main lining materials. Topping cements have either air or heat activated bond mechanisms and are for use above the molten metal level where lower temperatures exist for properly curing the cement. Patching cements are used to repair holes, cracks or areas of main lining erosion that may develop during the life of the lining. Primer cements are recommended to precondition areas to be patched. They are also used to provide increased protection as a wash coat after patching or as a surface sealer after presintering with a removable form.
Advantages
of dry vibrated linings
- No drying is required - saving time and manpower
- Sintering cycles are very fast
- Eliminates outgassing experienced with wet cements
- Installation may be stopped when convenient - saving on expensive overtime
- Excess material may be stored without loss of properties
- No heated storage necessary since no water present.
- Saves at least 50% on installation time
- Installation costs less
- Down time drastically reduced
- Allows for expansion and contraction
- Reduces cracking tendencies
- Runout problems due to metal fins are minimized
