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To maintain consistent quality, OBLUM have ventured and started producing Metal Oxide semi-conductor grade metallic oxides viz., Zinc Oxide in a thermic route and other Oxides like Bismuth Trioxide, Cobalt Oxide, Nickel Oxide and Manganese Carbonate by using solution chemistry involving special high purity materials in a multi step processes to produce high purity semi-conductor grade metallic oxides with precisely controlled physical parameters. These Metal Oxide semi-conductor grade metallic oxides are available both for captive consumption and for supplying to zinc oxide block manufacturers. The quality of these oxides is certified beyond expectation as the same are being used In-House for Zinc Oxide Discs.
Bismuth Oxide is the most important of a number of metallic oxides which optimize the properties of zinc oxide varistors. Cobalt Oxide is used as an additive in many advanced ceramic applications including varistors, thermisters, dielectrics, coatings and magnetic recording media. High purity grayish green Nickel Oxide is unique in many ways. Closely controlled physical parameters as well as low levels of iron, copper and interfacing ions make this product the choice for many applications including varistors.
The zinc oxide varistor consists of ZnO polycrystalline sintered body with main ingredient zinc oxide with host of the other additives viz., oxides of Bismuth, Antimony, Cobalt, Manganese, Nickel, Chromium, Silicon along with other dopants.
Bi2O3 is characterized by liquid phase sintering which results in the formation of an inter-granular layer. The improvement of non-ohmic properties are due to transition metal oxides of Cobalt and Manganese which distribute at grain boundaries. Oxides of Antimony and silicon are the grain growth inhibitors. Oxides of Nickel, Chromium and glass forming material stabilize the inter-granular barrier to increase the reliability. |
Atomic Absorption Spectroscopy:
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Master Sizer:
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| Trace impurity levels are determined in PPM levels. |
Measurement of particle size distribution of input and process materials. |
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