On the basis of a vacuum electric resistance furnace, an economical high-temperature installation for test fuses of quartz glass has been created. To modernize the melting chamber of a standard furnace, a heating unit with an operating temperature of up to 2200 ° C was developed and manufactured, consisting of a tungsten heater and molybdenum heat shields, which allows melting small-sized blocks of quartz glass. The upgraded furnace is used to assess the technological properties of natural quartz from different deposits. Il. 2.
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