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The remarkable properties of ceramic cores including stability in extreme conditions, refractory qualities and strength have made them ideal for a wide range of applications in the investment casting industry.

These cores help in the development of internal cavities that are either small or difficult to be shelled at the time of investment casting. However, in order to achieve quality results, the ceramic cores need to be made from an appropriate material depending on the application.

Another important parameter to be considered is the type of alloy used for casting. Ceramic cores can be cast with different types of alloys including titanium, aluminum, steels, and nickel and cobalt based alloys. However, there should be a perfect match between the ceramic and alloy used. Further, the parameters like the size and complexity of the cast material, and leachability also have a large impact on the selection of ceramic core.

The following are some of the frequently used ceramic core materials and their casting processes:

Figures 1 and 2 show components cast using ceramic core casting.

Following firing, the ceramic core may undergo additional processes to improve its performance at the time of investment casting process. These processes include impregnation of the core to enhance its stability at room or high temperatures. Some of the commonly used impregnation solutions include urea, water soluble polymer and colloidal silica.

Coating of the core surface to control grain growth or avoid core/melt reaction is another enhancement technique performed on heated core. The most common coatings include alumina and cobalt aluminate coatings. Regardless of the post-firing process, most of the materials are easily scraped out from casting through chemical leaching or using water jets.

The ease of removal after casting, high strength and stability in extreme conditions enable the ceramic materials to be widely employed in investment casting applications for various sectors. Modern ceramic materials have high performance, and are cost effective and suitable for complex casting processes.

However, modern casting procedures also involve the adaptation of most of these ceramic materials to meet the requirements of specific customers while the currently available methods can produce ceramic cores depending on the appropriate material.

This information has been sourced, reviewed and adapted from materials provided by Morgan Advanced Materials.

For more information on this source please visit Morgan Advanced Materials.

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