Conductive Alumina Ceramics: BZTA ceramics type A

"BZTA ceramics type A" is high-strength conductive alumina-based ceramics
with adjustable electrical conductivity from megaohms to gigaohms.

Features

“BZTA ceramics” is our original conductive ceramic material,
which was developed based on the concept of a new ceramic material
that combines high strength, high hardness, and electrical conductivity.

Type A is alumina-based ceramics among them.
By using alumina ceramics as a base and hybridizing with zirconia ceramics,
we were able to achieve up to twice the strength of alumina ceramics.

Comparison with common oxide ceramics

Material	Al₂O₃ （Alumina ceramics）	ZrO₂ （Zirconia ceramics）	BZTA ceramics type A
Lightness	◎	△	〇
Bending strength	△	◎	〇
Hardness	◎	〇	◎
Fracture toughness	△	◎	〇
Electric Conductivity	Insulative	Insulative	Conductive

Material property

Material	Alumina ceramics (Al₂O₃) Yttria-stabilized zirconia ceramics (3Y-ZrO₂) Titanium oxide (TiO₂)
Material	Sample #1	Sample #2	Sample #3	Sample #4
Color	Black	Black	Black	Whitish
Density [g/cm³]	4.39-4.40	4.39-4.40	4.76-4.77	4.48-4.49
Vickers hardness [HV1]	1400	1400	1400	1400
Bending strength [MPa]	400-600	400-600	700-1000	600-900
Young’s modulus [GPa]	320-340	320-340	300-330	320-340
Fracture toughness K_C [MPa･m^1/2]	3.8-4.0	3.8-4.0	4.4-4.6	－
Volume resistivity [Ω･cm]	10⁷-10⁸	10⁹-10¹¹	10⁶-10⁷	10⁹-10¹¹
Average expansion coefficient [×10^-6/℃]	7.0-8.0 (20℃-500℃)	7.0-8.0 (20℃-500℃)	8.0-10.0 (20℃-500℃)	－
Recommended usage conditions	In the air: room temperature In the non-oxidizing atmosphere: under 500℃		Room temperature	Under 800℃

Application

“BZTA ceramics type A” is used in application below.
　- Electrostatic charge preventive components
　- Heat resistant electrical resistance adjusting components

We can produce this material as precision fine parts by injection molding
or material for processing/machining.

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