Titanium Boron Aluminium Grain Refiners for Aluminium – Silicon Alloys (Al-Si)

 

Topics Covered

Background

Titanium Boron Aluminium Chemistry

Who Uses Titanium Boron Aluminium

Benefits of Using Titanium Boron Aluminium Refiners

Addition Rate

Background

Using grain refiners in castings helps enhance die filling and mass feeding, to counteract solidification shrinkage. This results in an improved distribution of porosity, and so better mechanical properties and increased leak tightness. These effects can result in a net reduction in scrap rates, and improved consistency and reliability of castings, delivering improved profitability in the foundry.

TiBAl is optimally adapted to hypoeutectic Al-Si foundry alloys. The extremely small amount of mixed borides (Al, Ti)B2 in TiBAl has proven to have a high grain-refining efficiency in Al-Si alloys.

TiBAl Chemistry

Nominal composition by weight.

Titanium

1.5-1.7%

Boron

1.3-1.5%

Silicon

Maximum 0.3%

Iron

Maximum 0.3%

Vanadium

Maximum 0.2%

Who Uses TiBAl

Foundries worldwide especially aluminium alloy wheel manufacturers have discovered that TiBAlloy offers a unique range of benefits not found with any other foundry grain refiner.

 

The considerably low density mixed borides are ideal to counteract settling effects in furnaces, crucibles or ladles.

Foundry ingot producers have seen lower complaints when using TiBAl. End users, particularly wheel casters, have achieved reduced scrap levels on machining and after X-ray inspection.

Benefits of Using TiBAl Refiners

The advantages of using TiBal are:

  • Features a residence time of just two minutes.
  • Ideal for long holding times and ingot remelting.
  • Highly efficient grain refining.
  • Improved mould filling.
  • Improved distribution of porosity gives less scrap after machining.
  • Fewer shrinkage defects.
  •  Reduced reject levels on x-ray inspection.

Addition Rate

Typical addition rate for TiBAl of 1-2 kg/MT (for Al-Si alloys containing approximately 0.1%Ti) can be adjusted to achieve the precise foundry grain refining properties desired for your application.

The product’s lower-density mixed borides (Al, Ti)B2 provide benefits for long holding times and also for ingot remelts.

 

 

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