Ceramic Core for Investment Casting

Ceramic Core works as an internal-cavity’s tool for casting. It is characterized by high strength and refractoriness and superior thermal stability. Such properties enable the ceramic core to bear attack from wax injection and extreme thermal shock during casting pouring. With excellent thermal stability and leachability, the Ceramic Core is widely used as processing tool for castings with open and blind internal cavity-forming.

Specification of Ceramic Core：

◎High strength to bear attack from wax injection and other processing treatment.

◎Enough refractoriness, suitable for AI，Iron and Steel casting.

◎No reaction with metal liquid at high temperature.

◎Low thermal expansion coefficient to ensure the accuracy of casting cavity.

◎An ideal tool to solve any internal cavity with complicated shape.

◎General tolerance is between ±0.5% ，special items go up to ±0.2～0.3％.

◎Surface quality, generally 10 times more smooth than that of the common sanding casting.

Specification	SY	ML	XX-T
SiO₂	＞75%	＜30	＜35%
ZrO₂	＞15%	＞10%	＜5%
Al₂O₃	＜10%	＞60%	＞60%
Porosity	15~20%	25~35%	40~45%
Water Absorption	8~12%	10~15%	20~30%
Bulk Density	1.8~2.2g/cm³	2.0~2.2g/cm³	1.5~1.8g/cm³
Bending Strength	>12MPa	>15MPa	>5MPa
Leachable Method	Drilling + Alkali Blasting	Drilling + Acid Immersing	Drilling+ Acid Immersing/ Alkali Blasting

Two kinds of ceramic core are available. Between the two, the SY series core of silicon base is characterized by high strength, that can be removed by alkali boiling or blasting after drilling. Generally it is used for sophisticated cavity-forming inside casting. While the ML series is alumina-based, that can be removed by acid immersing or sand blasting after drilling. To improve core’s leachability, we also provide the TQ series of the above materials. It is highly porous and easily removed, especially suitable for internal cavity-forming inside carbon steel casting.