Introduction
Isostatically Pressed Crucibles
The development of isostatically pressed crucibles was seen as a major breakthrough for the investment casting industry. Since that time continued research and development has been devoted to further refining and optimising both physical and chemical properties. Crucibles are formed at pressures of up to 20,000 psi producing parts with the ultimate quality, with uniform density and no inconsistencies in pore size. Today, our Company's crucibles are used in major investment casting establishments throughout the world. Among the most demanding of these are the aero-engine and turbine manufacturing facilities. In these applications especially, the melting vessels demanded need exceptional properties to ensure purity of melts of the exotic alloys used for intricate and expensive castings.
A number of presses are available, providing a comprehensive range of crucible sizes to suit most coreless induction furnaces in air or vacuum melting applications.
Vibro-cast Refractory Shapes
Vast ranges of refractory fired shapes are manufactured by the vibro-casting technique. Over the years Magna Industrials Ltd has built up a wealth of expertise in this field and will consider manufacturing any size and shape of component to meet the customer's specific requirements. These may include operating temperatures to over 2000° and involve small quantity production. The industries we serve are as diverse as the shapes and include precious metals, glass, investment casting, aerospace, automotive, heat treatment, telecommunications and furnaces.
Our experience in the production of vibro-cast refractories is second to none, with our special techniques ensuring excellent dimensional accuracy, freedom from impurity and sound structure, we are regarded as one of the world's finest makers of refractories.
Mixing
The refractory materials are automatically weighed, mixed and graded prior to pressing or casting in our highly sophisticated mixing station. The mixing stage is critical to the quality of the refractory part, and a formulated mix design, which uses the optimum mineralogy and particle size distribution is adhered to without change. The enclosed system is environmentally friendly, keeping particle dispersement levels to a minimum during loading and mixing.
Firing
Crucibles, transfer ladles and special refractory shapes are batch fired in modern gas fired kilns with PLC temperature controls for accurate and consistent monitoring of the critical heating and cooling cycles. Each part has a kiln batch number prior to firing for traceability purposes. A range of kilns is available with precise computer controlled regulators offering uniform kiln temperatures at up to 1650°. Our kilns have outstanding heat distribution and maximum oxygen in the atmosphere to assure thorough processing of each part every time.
Inspection & Quality Assurance
Every refractory part is individually inspected prior to firing and dispatch by our qualified inspectors; our quality assurance is strictly adhered to throughout the manufacturing process. Our adhered control is accredited by major companies throughout the World and ensures complete traceability of materials from start to finish. Our products are also subjected to in-house mechanical and chemical testing for apparent porosity, bulk density, thermal conductivity, specific heat and coefficient of thermal expansion.