Casting Titanium Alloys
Titanium offers a high strength to weight ratio and extraordinary corrosion resistance, making it an ideal choice for medical, marine, hand tools, sporting goods, and high performance automotive applications.
Casting Titanium Alloy Grade 2
Titanium Grade 2 is light weight and highly corrosion resistant. It is an unalloyed titanium and is considered a “commercially pure” titanium (TiCP). Thanks to its varied usability and wide availability, Grade 2 is used in most of the chemical processing plants and is cold formable. Grade 2 plate and sheet can have ultimate tensile strength at and above 40,000 psi.
With moderate strength and excellent corrosion resistance, it also offers ductility and high impact toughness, and good weldability. It is used commonly in applications that require welding. Grades 2 is not hardenable by heat treatment.
|Applications for Casting Titanium Grade 2|
|Chemical Processes||Grade 2 titanium is highly resistant to chemical environments including oxidising, alkaline, organic acids and compounds, aqueous salt solutions and hot gases. Its corrosion resistance holds up in, nitric acid, mildly reducing acids and wet chlorine or bromine gas.|
|Marine||In seawater, Grade 2 is resistant to corrosion at temperatures up to 315°C, rendering it ideal for a variety of marine uses.|
Casting Titanium Alloy Titanium Grade 5
Titanium Grade 5 is the most commonly used Titanium worldwide.
Titanium Grade 5 is alloyed with 6% Aluminum and 4% Vanadium and is commonly known as Ti 6Al-4V. Grade 5 or Ti 6Al-4V, accounts for 50 percent of total titanium usage the world over.
It can be heat treated to enhance mechanical properties. It can be used in welded fabrication at service temperatures of up to 315°C. This alloy offers high strength at a light weight, useful formability and high corrosion resistance.
|Applications for Casting Titanium Grade 5|
|Industries||Aerospace, medical, marine and chemical processing industries and oil field services.|
|Plate||The material is worked to the closest size of the desired part and the grain structure of the finished piece is more homogenous.|
|Heat Barrier||Titanium stops the heat and does not transfer to the rest of the assembly.|
Methods of Casting Titanium Alloys
- Machined graphite mold casting
This method can simplify molding and effectively control metallurgical quality. Thicker and larger size castings can be precisely made by this method.
- Ceramic mold investment casting
This method produces more precise castings, with details such as logos being clearly cast. Large sized and complex shape parts can be well cast using this method.
Surface Treatment for Casting Titanium Alloys
|Surface Treatment for Casting Titanium Alloys|
|Corrosion Resistance and Surface Treatment||1) the atmospheric oxidation treatment
2) precious metal coating
3) dry coating TiC, TiA membrane (CVD, w2, PCVD)
4) Pb + Pt + injection (ion beam and electron beam)
|Wear Resistance Surface Treatment||1) wet coating
2) thermal diffusion method
3) welding method
5) CVD, PCD, PCVD method
6) ion implantation
|Then Surface Treatment||1) surface finish
2) the mirror finishing