ZG Technical Ceramics are principle manufacturers of high
performance Zirconia Atomising Nozzles for use in the Powder
Metallurgy industry. Atomising nozzles are available in a wide
range of shapes and sizes, many to the requirements of individual
customers.
Applications include the casting and atomisation of Ferrous and Non
Ferrous melts.
One of the principle features of Zirconia nozzles is their close
dimensional accuracy, which promotes stable flow characteristics
under the most arduous conditions. The addition of specially
selected stabilising oxides provides high strength, excellent
erosion resistance and minimal cracking due to thermal shock/rapid
cooling.
ZG Technical Ceramics are a key manufacturer of high performance
zirconia atomising nozzles. Zirconia Atomising Nozzles are used
within the Powder Metallurgy industry and are a key component in
the manufacturer of metal powders such as: Stainless Steel, Nickel
& Colbalt based super alloys and other exotic alloys.
Powder Metallurgy
A range of ferrous and non-ferrous metals can be processed by the
atomisation process. The materials can range from crude aluminium
through to sophisticated super and rare earth alloys. Products
formed from the process are used in a diverse range of
applications, which include the automotive, aerospace, armament,
electronic surface coating, pyrotechnics, paint and refractory
industries.
- This process is a method of producing powders of varying grain size
for use as:
- Bearing surface coating
- Injection moulding
- Sintered products – welding rods etc.
- Photocopier inks
- Isostatically pressed parts such as gear wheels, valve seats and
magnets
- Home, garden and leisure products
Melting is carried out in high frequency or induction type
furnaces. The weight of the melt is generally small with a 200kg
charge considered average and a 5-6 tonne charge very large.
Cleanliness is paramount during the production process especially
with the melting and atomisation of super alloys where any
contamination would not be tolerated.
Iron powders can be melted by electric arc furnace or other bulk
melting operation. Consequently, the melt size is larger e.g. up to
50 tonnes.
Molten metal temperatures prior to atomisation can range from 800°C
(lead/aluminium alloys) to more than 2000°C (super alloy
production). Process times are generally measured in minutes but
new machines are being designed to operate on a more continuous
basis of up to 24 hours.
The actual atomisation or conversion of the molten metal stream to
powder is achieved by bombarding the stream with a high pressure
jet of air, inert gas or water.
ZG Technical Ceramics – Zirconia Atomising Nozzles
- Close dimensional accuracy for stable flow characteristics
- Used for the water and gas atomisation of ferrous and non-ferrous
metals
- Magnesia, Yttria and Ceria stabilising oxides promote excellent
erosion resistance and minimise cracking due to thermal shock
- Extensive global references
A comprehensive range of nozzle designs have been developed to suit
the specific requirements of the end user.
One of the principle features of Zirconia nozzles are their close
dimensional accuracy, which promotes stable flow characteristics
under the most arduous conditions.
The addition of selected stabilising oxides provides high strength,
excellent erosion resistance and minimises cracking due to thermal
shock / rapid cooling. These features are critical during the
production of super alloys due to high specifications relating to
contaminants.
1. Yttria stabilised zirconia with excellent erosion resistance
properties. High temperature resistance suitable for super alloy
and nickel based alloys.
2. Ceria and magnesia stabilised zirconia with excellent thermal
shock resistance. Suitable for high temperature production of super
alloys and nickel based alloys.
3. Zircon Nozzles
ZG manufacture a range of Zircon Atomising nozzles, mainly
used in the atomisation of Iron. Zircon nozzles are ideal for
shorter casting sequences or where nozzle erosion is less of an
issue.
We have stock for alumina (Al2O3) and make under request, in the
following materials:
- magnesia partially stabilized zirconia (Mg-PSZ),
- yttria-stabilized tetragonal zirconia (Y-TZP) zirconia
- partially stabilized with yttria (Y-PSZ),
- zirconia fully stabilized with yttria (Y-FSZ),
- zircon (ZrSiO2),
- aluminum titanate (Al2TiO5),
- mullite (Al6Si2O13)
