By Material

PHOTO:Al2O3 Alumina


Alumina (Aluminum Oxide, Al2O3)

Alumina is the most well-known and most commonly used fine ceramic material. It has the same sintered crystal body as sapphire and ruby. It has been used for decades in electrical components for its high electrical insulation, and is widely used in mechanical parts for its high strength, and corrosion- and wear-resistance.


Because alumina is a well-balanced material.
It is used in a wide variety of applications, including wear-resistant parts for high-temperature industrial furnace materials and various electronic components.
Alumina is the most well-known fine ceramic material for chemical and physical stability.
  • Thermal properties: High heat resistance and high thermal conductivity.
  • Mechanical properties: High strength and high hardness.
  • Other properties: High electrical insulation, high corrosion resistance and biocompatibility.


Dimensional precision achieved by machining

When dimensional precision is required for machined ceramics, Kyocera is capable of achieving the tolerances as shown in the table below. If greater tolerances are required, please consult us.

■MACHINING DIMENSIONAL PRECISION(Data are in mm unless otherwise specified)

1.Ground ceramic blocks and plates
IMAGE:Standard tolerance chart of ground ceramic blocks and plates
2.Round and Square Bars
IMAGE:Standard tolerance chart of round and square bars


Ultra-precision is possible with Kyocera's unique techniques.
Precision machining is affected by shape and material.
Some practical examples are shown in the table below.
IMAGE:Machining accuracy chart of shape and material
* Surface roughness depends on the material. The data shown hear indicates where alumina is used.


IMAGE:Alumina Material characteristic chart
*The values are typical material properies and may vary according to products configuration and manufacturing process.
  For more details, please feel to contact us.

  • IMAGE:Bulk density chart
  • IMAGE:Hardness chart
  • IMAGE:Flexural strength chart
  • IMAGE:Compressive strength chart
  • IMAGE:Young's modulus chart
  • IMAGE:Flexural strength vs. temperature chart
  • IMAGE:Thermal expansion chart
  • IMAGE:Thermal conductivity chart
  • IMAGE:Heat shock resistance chart
  • IMAGE:Max. use temperature chart

IMAGE:Chemical resistance chart (30 min  boiling)

IMAGE:Unit conversion table of stress & Unit conversion table of thermal conductivity

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