The main purpose of zirconia crucible melting your thin metal. Zirconia crucibles, high temperature stability, is ideal experimental temperature refractory products.
Zirconia crucible purity of 99.9 and a density of 6.00, the maximum temperature of 2200 degrees, mainly used in the smelting of precious metals, good thermal stability.
Zirconium and zirconium dioxide than high melting point, up to 2700 ℃, is one of the best fire-resistant properties of the material nature.
Its thermal conductivity is poor, but the conductivity is very strong, strong ability to hang eclipse, even if heated to over 1900 degrees Celsius does not act with molten aluminum, iron, nickel, platinum and other metals, silicates and acidic slag occur. So you can use it to create the precious metal smelting crucible refractory tubes, heat-resistant glass and enamel. Enamel and glass added zirconia allows them to enhance the acid and alkali resistance to corrosion. With zirconia lining furnaces, the volume does not increase a lot after being heated, it has little effect on the temperature change, the furnace due to thermal expansion and contraction without cracking, can greatly extend the life of the furnace.
Zirconium dioxide as refractories, add 5% calcium oxide as stabilizer, its heat resistant temperature of 500 degrees higher than alumina, added before the heat insulating capacity than triple. Braced the white zirconia ceramics, ceramic make whiter light, more heat, the intensity also increased, with the manufacture of high temperature insulation porcelain ceramic insulation are strong, low coefficient of expansion.
Resistance crucible melting furnace system for low-melting non-ferrous metals and alloys such as aluminum, zinc, lead, cadmium, tin and alloys such as melting or smelting purposes, the maximum operating temperature of 800 ℃. Resistance furnace smelting furnace shell made of steel and steel plate welded into the cylindrical structure, within which there are a variety of refractory brick heating chamber between the heating chamber and the furnace shell lined with insulation bricks and filled with insulation powder to reduce heat loss. Is processed by high-resistance alloy spirally arranged on the heating element surrounding the heating chamber brick shelf, and the outer line through the bar at power-on. The crucible made of graphite material in the heating chamber studio. In an electric furnace lower portion of the front end of a manhole cover, made for the regular purge the furnace inner dust, and in the crucible due to corrosion, oxidation cracks to form drips case, the solution can be in the crucible through which the stream released from the body, so that the heating element and the studio will not be damaged. Out of several layers of filling holes in the usual strawboard other combustible prevent cold air into the furnace chamber, the impact of warming. In the furnace is equipped with a back-end protection cover, tied with wiring devices heating element inside the casing, 380c or 220v power supply voltage for access, as long as the wiring in accordance with the instructions in the wiring diagram of the heating element can be energized heating use. With two semicircular flexible switch on the furnace lid panel. On the lid is opened for thermocouples inserted into the furnace with a round hole. Furnace temperature is compensated millivolt meter lead and turned to adjust the thermocouple is indicated by.