Electric Melting Z80 High Zirconia Bricks

Electric melting Z80 high-zirconia brick is a special ceramic refractory with high zirconia content and low silica/sodium levels, designed for severely corroded glass-contact areas or positions with high glass quality requirements.
Z80 can be used in high-fluorine, high-lead, high-boron, high-alumina and other special glass furnaces, especially for long-term service above 1550C and areas requiring high electrical resistivity.

●About 80% ZrO2, about 0.4% SiO2 and about 0.01% Na2O, with clear low-silica and low-sodium characteristics.
●Uniform overall density without typical defects such as element segregation, needle-like pores, trapped bubbles or surface holes.
●Stable high-temperature structure, non-reactive and non-coloring with glass, with extremely low bubble exudation.
●Custom sizes available up to 2000 x 500 x 250 mm, with one-piece customization available.

●Thermal shock test: Z80-A material, size 320 x 310 x 70 mm; heated from 29C to 1600C over 40 hours and held for 4 hours, with no visible cracks on inner or outer surfaces.
●Thermal penetration test: at 1600C furnace temperature, outer surface temperature was about 600C. A 70 mm thickness showed about 1000C temperature difference, roughly 14C reduction per millimeter.
●Bubble exudation rate: 0 at 1300C and 0.1 at 1500C.
●Borosilicate glass static test: after 1725C for 36 hours, the Z80 crucible inner wall and surface showed no obvious corrosion or glass phase exudation.
●High-fluorine high-sodium glass test: after 1550C for 36 hours, the Z80 sample showed no obvious chemical reaction or corrosion trace.

Production route: raw material electric melting - micron-level powder grinding - isostatic pressing - liquid-phase densification at 1950C - controlled crystal growth and annealing - machining and grinding - finished product.
This process helps avoid issues often associated with traditional fused casting, such as element segregation, unreleased pores/bubbles, uneven density and surface micro-cracks.

Extended product forms: high-density glass-contact lining layer, high-zirconia special-shaped accessories, glass heating/load-bearing plates, high-zirconia drawing crucibles, large-size high-zirconia ceramics and special glass melting crucibles.
Typical applications: special glass melting, high-fluorine glass, high-lead glass, borosilicate glass, high-resistivity areas, liquid-line contact areas and severe corrosion zones.

Product Customization

Please provide glass type, glass composition, operating temperature, application position, drawings/dimensions and expected service life. We can recommend Z80 specifications and composition adjustments according to the working conditions.

Request Z80 Quotation

Production equipment includes 8-ton and 10-ton electric arc furnace production lines, with the new line producing over 50 tons per day, plus 60+ machining machines and two 1,000 m2 assembly platforms.
Testing capabilities include chemical composition analysis, glass phase exudation, static and dynamic molten glass corrosion tests, bulk density, apparent porosity and internal filling inspection.

Our factory has complete in-house testing and quality control capabilities. We can test chemical composition, bulk density, apparent porosity, glass phase exudation, bubble exudation, static and dynamic molten glass corrosion resistance, internal filling quality and dimensional accuracy.

Main testing equipment includes a Rigaku X-ray fluorescence spectrometer, glass phase exudation test furnace, static molten glass corrosion test furnace, dynamic molten glass corrosion test furnace, bulk density and apparent porosity testing equipment, and a GSSI radar flaw detector.

With in-house testing and dimensional inspection before shipment, we can better control product quality and provide reliable material selection suggestions based on glass type, furnace area and operating temperature.