Machining / Grinding Microwave Lossy Ceramics

CiDRA® Precision Services, LLC has years of experience manufacturing micron level tolerance products from Microwave Lossy Ceramics. We leverage our in-depth dicing, drilling, milling, grinding, and polishing capability to manufacture the highest quality Microwave Lossy Ceramic products.

Whether you need prototypes or volume production, CiDRA® Precision Services, LLC is here to help. Please contact us to discuss your applications.

About Microwave Lossy Ceramics

Microwave Lossy Ceramics is a class of particulate composites that fire micron size, microwave dissipative particles into a ceramic matrix. These materials selectively absorb unwanted frequencies. There are several formulations to select from, making it possible to design narrow band and broadband absorbers. Ceradyne, Inc. markets a line of these ceramic materials. Ni-Zn Ferrites fall into this category as well, but their properties are listed under the Ferrites category. BeO and its composites can also be used as microwave lossy ceramics, but they are rapidly losing favor due to toxicity concerns during manufacturing.

Microwave Lossy Ceramics Applications

  • Microwave generators
  • Load pellets
  • Absorbers

Microwave Lossy Ceramic Properties

 

Units

Al2O3-SiC

MgO-SiC

AlN-SiC

AlN Composites
Max Use Temperature
(No Load)		 C
Thermal Shock (quenching) C
Thermal Conductivity W/(m K) 30 30 - 53 85 - 105
Specific Heat  J/(K kg)
Coefficient of Thermal Expansion 1/C (x10e-6) 14.5 - 15.4 5.1 5
Color
Moh Hardness
Vickers Hardness kg/mm^2
Knoop Hardness kg/mm^2
Density g/cm^3 3.36 3.48 - 3.5 3.19 2.99
Porosity % of nominal
Compressive Strength Mpa
Tensile Strength Mpa
Flexural Strength MPa 530 200 300 190
Fracture Toughness MPa m^1/2
Young's Modulus GPa
Poisson's ratio
Dielectric Strength kv/cm
Dielectric Constant (@1MHz) 69 - 150 10.9 - 12.8 15 - 22 18 - 38
Dielectric Loss Tangent 0.4 - 0.57 0.02 - 0.03 0.2 - 0.5
The information provided in this table is for room temperature only, and is a compilation of publicly available data. This information is provided for comparison purposes only, and is not intended to be warrantable. Further, CiDRA® Precision Services, LLC disclaims any and all liability from errors, inaccuracies, or omissions

 

Please contact us if you would like to discuss your Microwave Lossy Ceramic dicing, drilling, milling, grinding, polishing or any other machining applications.