Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Chemical Name
- EC No.
- 215-133-1
- CAS No.
- 1304-56-9
- Technologies
- Shapes
Flat components which can be pressed from dry powder having a minute amount of a binding material can be fabricated in both small and large volume at relatively very low cost when compared to other forming methods. Likewise rods and tubular shapes having lengthwise single or multiple holes can be extruded at very low fabrication cost. Adding features such as slots, blind holes, bosses, or steps increases both tooling and fabrication costs. Dome shaped and other more complex shapes more dramatically increase total component cost. Tooling is available to produce many shapes in a large variety of sizes. If a newly designed component is required for your application, a one-time tooling charge may be required. However these costs relatively less significant when amortized over the total number of components to be fabricated will not significantly impact part cost.
Features & Benefits
- Features & Benefits
Apart from reactivity with water vapor at high temperature (1000°C), BeO is one of the most chemically stable oxides, resisting both carbon reduction and molten metal attack at high temperatures.
- The thermal conductivity of BeO is extremely high in comparison with other ceramics, particularly below 300°C. For comparison, the thermal conductivity of Beryllium Oxide at Room Temperature is 285 W/mK, for copper it is 400 W/mK, for aluminum nitride it is 180 W/mK, and for diamond it is 2000 W/mK.
- BeO is classified as an electrical insulator with a bulk Resistivity on the order of 1016Ωcm.
- The mechanical strength is normally lower than that of alumina. Its fracture toughness is generally about half that of alumina; but with good design and controlled fabrication processing acceptable strength can be achieved for commercial applications of BeO.
- BeO has relatively very good thermal shock resistance due to its high thermal conductivity.
- Beryllium Oxide has a density fully 25% lower than Alumina. Comparing theoretical density values, BeO is 3.01g/cc while Al2O3 is 4.00 g/cc and AlN is 3.26 g/cc.
- The Coefficient of Thermal Expansion for BeO is comparable to many other oxide ceramics and many metals, as well, at approximately 7.5 in./in./°C for the range from 25°C - 1000°C.
Sintered BeO is a very stable ceramic and is used in a variety of applications where both high thermal conductivity and electrical resistivity is needed. The electrical isolation of BeO is equal to that of alumina, aluminum nitride, and many other electrical insulators. With 20% lower dielectric constant than alumina and aluminum nitride BeO offers advantages for application in high-frequency fields. BeO ceramic is utilized for its proven superior properties and its cost effectiveness unmatched by aluminum nitride, aluminum oxide, boron nitride, silicon carbide or any other oxide ceramic.
Applications & Uses
- Markets
- Applicable Processes
- Drilling & Grinding Methods
- CNC Surface Grinding - CNC machining can be used when designs call for extremely tight tolerances, e.g. tolerances as low as 0.00008", 80 millionths. Tolerances in this magnitude can only be achieved by surface grinding materials. This process is also used to create complex features such as grooves, notches, chamfers, radii, and profiles. These features are generally achieved through the use of custom formed diamond machine tooling. It is recommended that American Beryllia BERLOX® 99.5% material is specified for these components. This material exhibits superior machinability and will hold finer surface finishes because the materials have been processed to have a smaller fired grain size.
- Ultrasonic Drilling - Ultrasonic drilling is used when a customer's tube or laser bore design has tighter tolerances on the ID than can be achieved by pressing. The ID of the tube or bores has to be drilled instead of pressed in. Hole sizes in the range of 0.030" - 0.200" with a straightness of up to 0.0001" inch per inch can be achieved using this method of fabrication.
- OD/ID Grinding - OD/ID grinding is a machining function that is used when a customer's design has a tighter tolerance on the OD and/or ID profiling than can be met by pressing alone. The part is OD and/or ID ground to meet specifications. This type of machining can also apply any form, including threads, to tolerances as low as 0.0001".
- CNC Milling - CNC milling is a machining function that is used primarily to machine green (unfired) ceramic to near net shape. This reduces the amount of post-fired machining which is more time-consuming and, therefore, costly. This function can also be used to mill in pockets, grooves, etc.
Properties
- Optical Properties
- Optical Properties
Beryllium Oxide(BeO) is a well-known prototype refractory oxide with a wide range of applications ranging from optoelectronic devices to nuclear reactors. Since BeO is a wide-band gapoxide crystal, its application as an ultraviolet (UV) transparent conduction oxide in flat-panel displays and solar cells can be promising.
- Tolerances
As-fired tolerances for components having a length and width are typically ± 1% and thickness tolerance is typically ± 2% in all dimensions. As-fired tolerances are generally no less than 0.003". As-fired flatness is typically 0.004"; and as-fired camber tolerances for tube shapes will generally be 0.005" per 12" of length. Tighter tolerances may be requested and are achievable. Tighter tolerances will require some degree of post-fire machining operations and will result in higher overall finished component cost per unit.
| Value | Units | Test Method / Conditions | |
| Refractive Index | 1.719 | — | — |
| Wurtzite Phase Band Gap | 10.4 - 10.6 | eV. | — |
| Abbe Number | 93.25 | — | — |
| Chromatic Dispersion | -0.040303 | µm⁻¹ | — |