Metal ceramic tubes and elbows

All problems that arise due to excessive wear out (abrasion) during transport of various materials are solved if transport surfaces are lined with high quality ceramics. It is difficult to imagine contemporary pneumatic transports without tubes and elbows lined with ceramics. Large surfaces of various forms are successfully lined with ceramic mosaics and special ceramic tiles.
Ceramic mosaics and tiles are successfully fitted to surfaces that are exposed to a large rate of abrasion with the help of special adhesives (epoxy glue) or by mechanical fixing.

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Tubes and elbows with inner diameter of ceramics up to DN 200 mm are made from ceramic cylindrical segments, which have male and female parts (see photo up left). At assembly this assures high quality of joint and long life time.

Tubes and elbows which have inner diameter bigger than DN 200 mm are lined with panels (mosaics) or with cone ceramic plates with requested thickness. Cone plates are adjusted to diameter of the tube or elbow, which are lined with ceramics.

Conveyor nozzles are used to accelerate transport with injecting the air in very long transport pipelines. These nozzles are made from ceramic segments which have more than 30 inlets around the scope of nozzle. These inlets are directed in the centre of the tube and that provides consistent air pressure of transport media. At the moment, this is the best solution in technology of pneumatic transport.

Here are some basic reasons, why you should use our ceramic-lined tubes and elbows:

  • Because we are the only manufacturer producing metal ceramic elbows with an inner diameter of DN 200 using a bending technology and segments welding technology;
  • Because we are the first and the only manufacturer that produces ceramic segments according to the principle male-female segment, where we prevent the possibility of the elbow material wearing down at the joint of two ceramic segments;
  • We are the only manufacturer with our own line of ceramic production, while we also produce complete metal-ceramic products ourselves;
  • All our products are made using a minimum blend of 95% Al2O3 up to 99,7% Al2O3 in relation to the rate of abrasion of the transported material.


MATERIALS

Materials that are used for protection of elbows and tubes are:

  • Aluminium Oxide 95% Al2O3
  • Aluminium Oxide 99,5% Al2O3
  • Composite Al2O3 +10% Zr02
  • (Aluminium Oxide + Zirconium Oxide)
  • Zirconum Oxide ZrO2

MECHANICAL PROPERTIES

The widest application of ceramics comes from its excellent mechanical properties.

High hardness and wear resistance, modulus of elasticity, comprehensive and fl exural strengths have enabled the application of ceramic parts there where high mechanical stresses are expirienced.

Such high strength of Al2O3 ceramics is maintained at high temperatures and high abrasiveness, what makes it an excellent replacement for majority of metals, glasses, plastics, etc.

APPLICATION

Elbows and tubes with ceramic lining have wide application in different industries like pneumatic and hidraulic transport. The most common applications are:

Industry Material
1. Abrasive products Grinding wheel granules
2. Aluminium plants Calcined alumina, bauxite, electrode, carbon, crushed bath
3. Iron & Steel Sinter dust, limestone, lime injection, coal, iron carbide, alloy additives
4. Mineral wool & insulation products Perlite, stone dust, refractory fibers, production wastes, dust from sawing operations
5. Foundries Molding sand, dust collection
6. Glass plants Batch, cullet, quartz, kaoline, feldspar
7. Breweries, grain processing, feed mills Corn, barley, soy beans, malt, cocoa beans, sunflower seeds, rice hulls, malting plants
8. Cement Clinker dust, limestone, cement, fly ash, coal, blast furnace slag
9. Chemical plants Caustic lime, fertilizers, lime dust, chrome ore, paint pigments, plastic pallets with glass fi bers
10. Mineral mining plants Kiln feed, ore concentrate, coal tailings, dust
11. Coal fired power stations Coal, fly ash, pyrites, slag, ash, limestone
12. Coal mines Coal dust, mine waste for backfi lling
13. Technical carbon products Technical carbon, dust, graphite for electrodes

WEAR TESTS ON DIFFERENT MATERIALS

SAMPLE CERAMICS
99,5% Al2O3
CERAMICS
95% Al2O3
MELTED BASALT RUBBER STEEL
Density: (g/cm3) 3,85 3,7 2,95 1,18 7,85
Mass wear: (gr) 0,007 0,009 0,12 0,2 1,51
Volume wear (cm3) 0,0026 0,0028 0,04 0,17 0,19

Test is made under folowing conditions:

  • Radiation angle: 30 deg
  • Pressure: 5 bar
  • Time: 5 minutes
  • Abrasive material: SiO2

CERAMIC LINING FOR LARGE SURFACES

For lining of large surfaces as well as for different shape of surfaces, we use different ceramic tiles (plates) and different mozaics. Materials that we use are 92% Al2O3, 95% Al2O3 and 99,5% Al2O3.

We make ceramic tiles (plates) in different sizes and thicknesses; it depends on operating conditions and place where they are mounted. Tiles are fixed with special epoxy glue that has very good properties of fixing.

At lining of surfaces, which are exposed to high temperatures and vibrations, epoxy glue is not enough to assure the quality of metal-ceramic. Plates with holes are beside glue, additionaly fixed to surface with steel ferrule, which is welded on it, or it is adjusted to surface with screw and nut. Some plates can be adjusted mechanically, because they have swallows tale.

Besides standard panels (mosaics) we produce also special panels, on which ceramics has special shape (different convex parts, nipples). According to customers request we can also vulcanize panels in rubber, which makes the usage of panels bigger, on surfaces which are exposed to different vibrations and punches.

Ceramic mozaics are very suitable for lining of large surfaces, silos, irregular surfaces and many other shapes.

Contact info

AVTO G d.o.o., Šlandrova ulica 4, 1231 Ljubljana, Slovenia

info@avtog.com +386 1 237 35 10