Jonathan Kaplan on sun 14 mar 99
Been researching all my refractories books and there is no mention of a
class of refractories called "graphite refractories."
There are, hower, a huge class of brick known as "basic refractories"
encompassing chemically bonded materials, metal encased chemically bonded,
burned brick, burned brick metal encased, and pitch impregnated brick.
These refractories are used in steel plants, class and cement plants and
other related metalurgical facilites. These brick are made from
magnesia/chrome combinations. Some pitch bonded refractores and
magnesia-dolomite type and some are periclase.
There is another catagory of refractories that are silicon carbide
available in most standard refractory shapes.. I had a pallet of these and
used them for kiln furniture, bagwalls, etc. They lasted forever, of
course. They also weighed about 15-20 pounds per brick.
Anyone have pertinant information of graphite refractories....if there are such?
Jonathan
Jonathan Kaplan, president
Ceramic Design Group LTd/Production Services
PO Box 775112
Steamboat Springs, CO 80477
(970) 879-9139 voice and fax
http://www.sni.net/ceramicdesign
Bill Aycock on mon 15 mar 99
One of my (very old) references on Ceramics lists Graphite bricks in their
refractories section. It is listed as "neutral", and has very poor
insulating properties. It is used mostly in the steel making industries,
particularly when caustic slags are involved.
An interesting comment was that it was used in some special ceramic
processes because silica would not "wet" it. (this means that glaze drips
wont stick !!.)
An interesting variety of Graphite brick that I have seen, was "pyrolytic"
graphite- made by passing methane gas over the brick at very high temp- the
methane breaks down and lets the carbon grow graphite crystals on the
brick- This material is interesing because heat will flow through it very
easily in one direction (along the crystals), but very poorly at a right
angle to that (accross the crystals). It works as a "heat pipe".
Bill- on a Persimmon Hill that has ALL the ground saturated.(Squish-squish)
-
Bill Aycock --- Persimmon Hill
Woodville, Alabama, US 35776
(in the N.E. corner of the State)
W4BSG -- Grid EM64vr
baycock@HiWAAY.net
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