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Topics Covered
Background
Product
Overview
Properties
Boards, Cylinders and Custom
Machined Parts
Zircar’s
Buster M-35 and Buster A-30
Background
Typical features of ZIRCAR Zirconia’s Type Buster alumina boards, discs and
cylinders include:
- 1600°C, 1700°C & 1800°C Rated Versions
- Alumina or Mullite Bonded
- High Strength
- Low Thermal Conductivity
- 100% Fibers & Binder - No Fillers
- Excellent Machinability
- Non-RCF Composition
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Product Overview
Zircar
alumina insulation Type Buster is a rigid, fibrous ceramic material produced
by vacuum forming alumina fibers with either a high purity alumina binder in
Buster A-30 for use at 1600°C or with silica binders in Buster M-35 that form a
mullite bond for use at 1700°C. Buster M2-35 is a mullite bonded 1800°C version
that exhibits complete dimensional stability to 1700°C.
Properties
Typical properties of Zircar’s Type Buster alumina ceramic fiber boards, discs and
cylinders.
|
|
Buster M-35 |
Buster
A-30 |
|
Density, pounds per cubic
foot |
35 |
30 |
|
Porosity, % |
83 |
85 |
|
Alumina content, % |
85 |
97+% |
|
Thermal conductivity at 1400°C,
W/m.K |
0.24 |
0.24 |
|
Linear shrinkage, 1hr at 1600°C,
% |
<3% |
3% |
|
Specific heat, J/kg.K |
0.25 |
0.25 |
|
Thermal expansion, /°C |
5.0x10-6 |
7.5x10-6 |
|
Tensile strength (MOR), psi |
350 |
250 |
|
Compressive strength, psi @ 2% compression
parallel to thickness |
289 |
45 |
Boards, Cylinders and Custom Machined Parts
Zircar’s
Buster is available in boards, cylinders and custom machined parts. All
Buster boards are pre-fired for organic-free use. Their fine grain quality
enables precision machining. The even binder distribution allows these materials
to be dry machined to tight exacting tolerances with solid carbide or carbide
tipped tooling. High tool rotation speeds and slow feed speeds are generally
best. Their superior machinability and dimensional stability plus low heat
capacity make them ideal for use as setters, supports and process fixtures in
both continuous and batch firing furnaces.
Zircar’s Buster M-35 and
Buster A-30
High purity silica is the binder in Zircar’s Buster
M-35. Silica's strong bond gives Zircar Buster
M-35 excellent high temperature strength and thermal shock resistance. Zircar Buster
A-30 has a high purity alumina bond making it well suited for use in high
vacuum and reducing atmosphere applications where silica cannot be tolerated,
such as in bright annealing furnaces with hydrogen atmospheres.
They both have high electrical resistivity at elevated temperatures allowing
them to be used in direct contact with many different resistance heating
elements. They show excellent resistance to chemical attack and are not affected
by oil or water. They are, however, affected by hydrofluoric acid, phosphorous
acid and strong alkalis
Source: Zircar Zirconia
For more information on this source please visit Zircar
Zirconia.