Fused Alumina

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Zirconia Fused Alumina

Zirconia fused alumina is produced by melting aluminum oxide and zirconium oxide in an electric arc furnace at temperatures above 2000°C. It typically contains 10%-40% zirconium dioxide (ZrO2) and exhibits high toughness, dense structure, high strength, and good thermal stability, usually appearing in gray-brown color.

Features

High hardness: zirconia fused alumina boasts exceptional hardness, often exceeding 9 on the Mohs scale, making it ideal for precision and high-efficiency abrasive machining.
Excellent wear resistance: This abrasive material maintains long-lasting cutting and grinding efficiency while reducing tool wear and extending equipment lifespan due to its outstanding wear resistance.
Low thermal expansion: With a low coefficient of thermal expansion, zirconia fused alumina demonstrates good stability and resistance to deformation under high-temperature conditions.

Applications

Depending on the ZrO2 content, it comes in two variants: zirconia fused alumina 25 (ZrO2 25%) and zirconia fused alumina 40 (ZrO2 40%). zirconia fused alumina 40 exhibits better self-sharpening properties than zirconia fused alumina 25, suitable for cutting wheels, coated abrasives, etc. zirconia fused alumina 25 is ideal for heavy-duty grinding.

Zirconia fused alumina micro powders are primarily used in manufacturing polishing compounds, polishing wax, sandpaper, etc.
It serves as a premium refractory material for manufacturing high-performance sliding nozzles, immersion nozzles, glass melting kiln bricks, and high-end building materials.
With excellent resistance to molten metal corrosion, it acts as a superior abrasive, providing efficient grinding for steel, cast iron, heat-resistant steel, and various alloy materials. It can be used to produce high-performance heavy-duty zirconia fused alumina grinding wheels, rough grinding wheels, cutting discs, rail grinding, high-speed sand belts, etc.

Available Grain Sizes

Fraction	0-1mm,1-3mm, 3-5mm, 5-8mm
Fine Powder	100#-0,200#-0,320#-0
Grit	4#, 5#, 6#, 8#,10#, 12#, 14#, 16#, 20#, 22#, 24#, 30#, 36#, 40#, 46#, 54#, 60#, 70#, 80#, 90#, 100#, 120#, 150#, 180#, 220#
Micro Powder	240#, 280#, 320#, 360#, 400#, 500#, 600#, 800#, 1000#, 1200#, 1500#, 2000#, 3000#

Typical Physical Propertie

Items	ZA40%	ZA25%
Color	gray
Specific Gravity	4.65 cm3/g	4.35 cm3/g
Knoop Hardness	1620kg/mm2	1780kg/mm2
Melting Point	1900℃	1950℃
Crystal grain size	≤30µm
Loose Pack Density	1.88-2.35cm3/g	2.15-2.45cm3/g
Chemical Species	Amphoteric
Reaction with acid and alkali	No reaction
Reaction with carbon	Forms carbide when reaching 1650℃ (contact with carbon)
Mohs Hardness	9.0
Specific Heat Capacity	0.2205cal/g.℃ (50-500℃)
Heat Transfer Coefficient	0.2718 cal/cm2.sec.℃
Thermal Expansion/Linear Coefficient	6.82x10-6 (100-700℃)

Typical Chemical Analysis

Items	AlO3	ZrO2	TiO2	Fe2O3	SiO2
ZA25	68-72	24-30	1.0max	0.5max	0.3max
ZA40	55-57	35-44	1.0max	0.4max	0.3max

Production Flow

Smelting
Rapid cooling of steel slabs
Cooled zirconia fused alumina blocks
Crushing and sand making
Finished blocks and sand products

Packaging

25KG Small bags
Small bags Bulk bags