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HP Technical Ceramics
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Information
about some ceramics: ·
Alumina is a strong and hard material with
good electrical insulation property up to 1400oC. It withstands
heat up to 1670oC in air and has good resistance to alkali. ·
Mullite has less
mechanical strength and hardness but has superior thermal properties. ·
Silicon carbide is the hardest material
practically available to industry. It is often used for wearing resistance
applications in hostile environments. It can be microwave heated to red hot
in seconds (1200o C in your own microwave oven!
). Our silicon carbide pipes with up to 500 mm diameter manufactured
has been used in the most hostile environments and it has been proved that
its wearing resistance is 10-15 time better than steel. ·
Zirconia in partially stabilized form is the
toughest material among ceramics. It can be used up to 1750oC but
it has a relatively poor thermal shock property. Zirconia ceramic has an
excellent resistance to attacks by various molten metals. However the cost to
manufacture this material is relatively high. ·
Fused silica has a near zero thermal
expansion coefficient, hence a well known ceramic
material for its excellent thermal shock resistance. It is most suitable for
applications requiring rapid thermal cycling (up to 1500oC). Fused
silica also has an excellent chemical resistance in severely acidic
conditions. ·
.Boron nitride is a soft ceramic and therefore
can be machined to various shapes with conventional tools. It can be used up
to 1100oC in air and to 3000oC in non-oxidizing
environment. A unique property of boron nitride is the non-wettability by
many molten metals and glasses at elevated temperatures. .BN is expensive
(about £60 per kg), thus BN in coating form is
developed at HP Technical Ceramics. |
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New Product Developments: 1.
Ceramic filter with various pore size ranges and low pressure
drop. 2. Poreslides: Ceramic substrates with nano-pore surface structure, a unique platform for chemical and bio-chemical applications. |