4.975" DIAMETER CONTROLLED POROSITY ALUMINA CERAMIC RING WASHER No.: 516

Description

4.975" DIAMETER CONTROLLED PORSITY ALUMINA CERAMIC RING WASHER SPACER BUSHING
No.: 516
You are buying on a ONE (1) only Thin Square Controlled Porosity Alumina Ceramic Sheet Membrane Substrate Cover Lid Setter. It is in excellent being NOS (New Old Stock). They are made from 99.7% purity Aluminum Oxide (Al
2
O
3
) which of course is Alumina. Generally the balance of composition for this purity Alumina material is of Silicon Dioxide (SiO
2
) which is Silica. This material has very high stiffness, very good corrosion resistance to chemicals at high temperature, and very high refractoriness or use temperature. is a porous, fired alumina ceramic plate used to cover green ceramic parts during firing. The weight of the porous plate enhances the flatness of fired parts while retaining gas permeability during organic removal, thus allowing single firing. The plate may also be used as a setter to promote more uniform burnout of binders during firing.
Uses include Fuel Cell applications such as SOFC electrolyte substrates, and other processing of ceramic tape. They may be used for a variety of electrical, mechanical, and thermal applications. They are great for firing sample in a high temperature kiln. The may be slumped at 3100 F (1700 C).They are sufficiently thin to use as diffusers of light. They are great for diffusion experiments or sculptural works of art. Your imagination is the only limiting factor in the spectrum of possible applications for this component. Be sure to view all photos as they are an integral component of the item description.
The specifications for these components are as follows:
Outside Diameter:
Approximately 4.975”+/- 0.010" (126.4 mm)
Inside Diameter:
Approximately 3.75” +/-0.010" (95.25 mm)
Thickness:
Approximately 0.300” (7.6 mm)
Thickness Tolerance:
mean ± 10%
Camber:
(parallel plate gauge) 0.5 mm/100 mm
Please Note:
There are slight differences in any or all of the dimensions. These are not precision technical ceramic components.
Specific Gravity or Density:
2
.9 g/cm3
Water Absorption or Porosity:
45.5%
Fusion Temperature or Melting Temperature:
2000 °C or 3550 °F
Recommended Use Temperature:
up to 1450°C
Maximum Working Temperature:
1550 °C or 2830 °F
Re-Flatting Temperature
1550°C
Thermal Conductivity:
.25 W/m* K
Specific Heat:
0.9 J/g*K
Expansion Coefficient or CTE:
7.5 x 10
-6
inches/°C
Electrical Resistivity at 20 C:
10
14
Ohm*cm
Electrical resistance at 600 C:
10
8
Ohm*cm
Modulus of Elasticity:
44 x 10
6
p.s.i. or 350 GPa.
These components were not specifically manufactured for an individual application; therefore be sure to check the dimensional descriptions carefully for your application. Future returns or requests for refunds, because of some "fit" issue or the like will not be honored. Please check the other Alumina component variants that are available in my listings for the model or models that best fits your requirement.
Your imagination is the only limiting factor in the spectrum of possible applications for these components and materials.
If you require additional technical information, design, or application engineering consultation, feel free to contact us. As a materials scientist with four decades experience in high temperature processing, ceramics, dentistry, and jewelry manufacture it will be possible to provide you with creative and imaginative approaches to your requirements.
Feel free to ask any questions you may have regarding this item early. Use PayPal only.
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No.: 516