Speciality Powders for the Cast Metal Investment Casting Industry

The term investment casting derives from the characteristic use of mobile ceramic slurries, or ‘investments’, to form moulds with extremely smooth surfaces. These are replicated from precise patterns and transmitted in turn to the castings. Although certain variants employ permanent patterns and multi-part moulds analogous to those used in sand casting, investment casting has become closely identified with the expendable pattern principle typified in the long-established lost wax process. In brief, disposable replicas of the required casting are formed by injecting molten wax into a die with the appropriately shaped cavity. The wax patterns are connected, singly or in groups, to a wax sprue and gating system and the whole is clothed in investment slurry. The wax is melted out and the investment consolidated by heating, leaving a hard ceramic mould to receive the molten metal. The mould is finally broken up to extract the solidified metal product.

Turbine engine components such as blades and vanes constitute the biggest single market for investment castings; nevertheless, there are a very great diversity of other applications.

In many cases, the choice of the investment casting route is dictated by technical considerations – property requirements, design complexity – but in more and more cases the process is being selected because if offers the cheapest manufacturing option in terms of total costs.

* Aerospace * Power generation (land based gas turbines)
* Automotive products * Food processing
* Fighting vehicles * Petrochemical equipment
* Field guns * Computers
* Automatic weapons * Pumps
* Rifles/sporting guns * Safety equipment
* Missiles * Yachting chandlery
* Rocketry * Bicycle parts
* Satellites * Roulette Wheels
* Hovercraft * Equestrian products
* Medical implants * Artwork
* Medical instruments * Golf clubs
* Orthopaedic appliances * Musical instruments
* Nuclear power * Cigarette making machinery

Minchem HMP Ltd has developed products in our ZircozonTM range that give additional strengths and benefits to the processes involved in the Cast Metal Investment Casting Industry. For full details please contact the office.

Zircozon 200M – multimodal zircon powder
Zircozon 300M – multimodal zircon powder
Zircozon Granular M170 – calcined zircon sand

Fused Silica

Fused Silica is an amorphous siliceous glass produced by high temperature fusion of high quality crystalline silica (quartz). The fusion produces a substance characterised by very low thermal expansion and a high resistance to temperature and thermal shock. Fused Silica is employed in a variety of industrial applications including foundry (investment casting slurry and stucco, and mould release agent), refractory and ceramic (crucibles, saggars, rollers, pouring cups, ceramic cores, gas fire radiants and items for steel, non-ferrous metal and glass industries), and filler (electronic and adhesive).

Available Sizes:

-150 mesh powder (100 microns) – D50 - 50 -200 mesh powder (75 microns) – D50 - 35
-300 mesh powder (53 microns) – D50 - 30 -325 mesh powder (45 microns) – D50 – 20

Typical Chemical Composition

Silica Si02 99.8%
Alumina Al203 0.2%
Iron Fe203 0.01%
Titania Ti02 0.003%
Density 2.17g/cm3 min
Minchem Limited
The Old Pottery,
4 Hillside Road,
Aldershot,
Hampshire,
GU11 3NB
UK
+44 (0) 1252 350504