burnt-in sand的意思|示意

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Burnt-in sand，or BIS，is a type of sand used in metal casting and other manufacturing processes. It is made by heating sand at high temperatures and allowing the sand to become hard and brittle. The resulting material is extremely strong and durable, making it ideal for use in casting molds and other metalworking applications. BIS also has excellent thermal properties, which makes it suitable for use in heat treatment processes such as forging and hardening.

BIS is typically made from either silica sand or chromite sand. Silica sand is a type of mineral quartz that is mined from the earth, while chromite sand is a type of ore that is mined from chromite deposits. The sand is heated to temperatures upwards of 800 degrees Celsius, causing it to become hard and brittle. This process is known as sintering.

Once cooled, BIS is ready for use in casting molds and other metalworking applications. The material is then used to create the desired shape of the metal part. It acts as a buffer between the molten metal and the mold walls, helping to ensure the part retains its intended shape during the cooling process.

BIS is also used in many heat treatment processes, such as forging and hardening. In these processes, the sand absorbs heat from the molten metal, which helps reduce thermal shock and provides an even heat distribution. This helps ensure the metal part has an even finish and is free from any deformations.

Overall, BIS is an incredibly versatile material and can be used in a wide range of metalworking applications. Its strength and durability make it ideal for casting molds, while its excellent thermal properties make it suitable for heat treatment processes.