Zirconium Oxides

Zirconium Dioxide 

Available optical coating materials include pure Zirconium Dioxide (ZrO₂), commonly referred to as zirconia, which is white in color. Alternatively, there is the option of oxygen-deficient zirconium, ZrO₂-X, characterized by a gray hue. These materials are offered in both powder and tablet forms, catering to various application needs.

In its most natural form it has a monoclinic crystal structure. However, it can transition to other structures under certain conditions. When heated, it can shift to a tetragonal phase or a cubic structure, depending on the heating temperature.

Zirconium Dioxide (ZrO2) Specifications

ShapeColorPurityPackageStorage
SinterTablet18x12 mm
24x14 mm
30x10 mm
8x5 mm,10x5 mm
12x8 mm, 39x14 mm
(dia.range: 8.42 mm)
White
Black
99.9%
99.99%
1 Kg/BagAvoid exposure to sunlight & acid
Keep dry
Cuboid piece15x15x10 mm
Granule1-3 mm; 3-5 mm

Characteristics of ZrO2

CAS NumberDensity (g/cm3)Boiling point (Cº)Melting point (Cº)Refractive index at 550 (nm)Transparency range (µm)Evaporation source
1314-23-45.89/4.17
430027151.97-2.050.25-9E
ApplicationsMulti-layer coating: AR coating; Hard coating; Glass coating

ZrO2 Evaporation techniques

The electron beam is used to melt the surface of a ZrO2 tablet in a vacuum chamber, which evaporates, evaporates from a Mo-liner Cu crucible. It only melts superficially and predominantly sublimates.

The resulting ZrO2 vapors are then deposited on a thin film as a coating using the physical vapor deposition technique.

The zirconia tablet must be heated and melted uniformly and effectively by an electron beam to maintain its stability.

The tablet’s vaporization and melting rate and stability are controlled by key operating beam parameters such as beam power, focus, scanning pattern, scanning frequency, and angle of incidence of the electron beam at the target tablet.

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