A sintered body of aluminum nitride is disclosed having a high thermal conductivity and a high density of at least 3.2 g/cm and comprising at least 94% by weight of aluminum nitride, at most 0.5% by weight of bound oxygen, at most 1% by weight as metal of an oxide of at least one metal element selected from alkaline earth metals, lanthanum group metals and yttrium and at most 0.1% by weight as metal of metal compounds as impurities, wherein the metal of the metal compounds is silicon, iron, chromium, nickel, cobalt, copper or titanium.

Sintered high thermal conductivity aluminium nitride ceramic body

Sinterable aluminum nitride composition

Aluminium nitride powder and sintered product

Tubular components made from densely sintered aluminium nitride which has a satisfactory thermal conductivity, a high electrical resistance, satisfactory dielectric properties, as well as high strength. Advantageously one or more oxidic materials may be added to the aluminium nitride. Preferably yttrium oxide is used as an additive although the additives may consist generally of oxides of alkaline earth metals or of rare earth metals or of transition elements of the IVth, Vth or VIth groups of the periodic system or they may consist of aluminium oxide or silicon oxide. The invention is particularly useful for making laser tube components.

Sintered high thermal conductivity aluminium nitride ceramic body

Citations

Sinterable aluminum nitride composition

References

Aluminium nitride powder and sintered product

Tubular components of densely sintered ceramic materials

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