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Ζirconia Silicate (Zircon) Crucibles for glass making laboratory, non-ferrous metals and alloys, especially Aluminium
Zirconium Silicate ( ZrSiO4) or Zircon has unique and outstanding properties as a refractory material. It has no definite melting point and dissociation into zirconia and silica begins at 1550°C with little physical change apparent until 1700°C. Its favorably low thermal expansion properties and lack of crystalline inversion give it a higher thermal endurance than other ceramic refractory materials.
One of the major uses of Zircon crucibles is in the glass making
laboratory. When glassy or siliceous slags are present in your melt
ceramics Zircon crucible is the solution. Zircon crucibles are
often used for melting platinum-group alloys. Their strength and
resistance to high temperature makes them right for those special
“dirty refining” applications. Zircon crucibles are also suitable
for metal melting and casting since the cast metal does not stick
to the crucible even at high temperature. Zircon crucibles performs
well with many non-ferrous metals and alloys, especially Aluminium.
Zircon is not “wetted” by Aluminium, so is relatively unreactive.
Zirconia Silicate (Zircon) Crucibles Key Features:
Related Data
| Main component | 99%Al2O3 | S-SiC | ZrO2 | Si3N4 | ||
| Physical Property | Density | g/cm3 | 3.9 | 3.1 | 6 | 3.2 |
| Water Absorption | % | 0 | 0.1 | 0 | 0.1 | |
| Sinter Temperature | °C | 1700 | 2200 | 1500 | 1800 | |
| Mechanical Property | Rockwell Hardness | HV | 1700 | 2200 | 1300 | 1400 |
| Bend Strength | kgf/mm2 | 3500 | 4000 | 9000 | 7000 | |
| Compression Intensity | Kgf/mm2 | 30000 | 20000 | 20000 | 23000 | |
| Thermal Property | Maximum working temperature | °C | 1500 | 1600 | 1300 | 1400 |
| thermal expansion coefficient 0-1000°C | /°C | 8.0*10-6 | 4.1*10-6(0-500°C) | 9.5*10-6 | 2.0*10-6(0-500°C) | |
| 5.2*10-6(500-1000°C) | 4.0*10-6(500-1000°C) | |||||
| Thermal Shock resistance | T(°C) | 200 | 250 | 300 | 400-500 | |
| Thermal Conductivity | W/m.k(25°C | 31 | 100 | 3 | 25 | |
| 300°C) | 16 | 100 | 3 | 25 | ||
| Electrical Property | Resisting rate of Volume | ◎.cm | ||||
| 20°C | >1012 | 106-108 | >1010 | >1011 | ||
| 100°C | 1012-1013 | – | – | >1011 | ||
| 300°C | >1012 | – | – | >1011 | ||
| Insulation Breakdown Intensity | KV/mm | 18 | semiconductor | 9 | 17.7 | |
| Dielectric Constant (1 MHz) | (E) | 10 | – | 29 | 7 | |
| Dielectric Dissipation | (tg o) | 0.4*10-3 | – | – | – | |
Applications.
Analytical applications, metals melting, ceramic powders heat treatment, material acid treatment. Zirconia crucibles are ideal for the melting or sintering of precious metals and super-alloys. One of the major uses of Zircon crucibles is in the glass making laboratory. When glassy or siliceous slags are present in your melt t-ceramics Zircon crucible is the solution. Zircon crucibles are often used for melting platinum-group alloys. Their strength and resistance to high temperature makes them right for those special “dirty refining” applications. Zircon crucibles are also suitable for metal melting and casting since the cast metal does not stick to the crucible even at high temperature. Zircon is notable in being unwetted by molten Aluminum.
