This article will go over the properties, basic materials and binders, and principles for determining induction furnace refractory lining.
The refractory lining material is a heat-resistant material used in the construction of industrial equipment that will be subjected to high heat loads. The material must withstand temperatures ranging from 1000°C to 2000°C. So that when used, the material can withstand high temperatures without melting. Furthermore, it does not burn to ash or gas as the temperature rises.
Refractory lining material (in the sense of metal casting) is a special ceramic mineral that has the following properties when subjected to the sintering process.
Induction furnace lining properties
Resistant to high temperatures
High temperatures during the melting process and rapid temperature changes from high to low (temperature shock) frequently occur, particularly when raw materials are loaded into the furnace.
Resistant to mechanical influences
Mechanical forces are caused by liquid pressure, raw material impact, and friction, whether the material is frozen or melted.
Resistant to chemical influences
Metallurgical effects of reactions that occur between lining and liquid slag, foreign elements derived from raw materials (Zn, Pb) that can infiltrate between lining gaps at temperatures that are very liquid.
This refractory or lining material is made up of the base material and the binder described below.
Lining base and binder material
The basic materials commonly used are:
- Silica ( SiO2) with Acid properties for Iron material
- Alumina (Al2O3) with Neutral properties for Iron and Steel materials
- Magnesite ( MgO) with Alkaline properties for Steel material
The binding material depends on the binding system, such as:
- Ceramic bonds e.g. silica and magnesite
- Chemical bonds e.g. drill acid or oxide drill
- Hydraulic bonding e.g. cement
- Clay bonds e.g. clay or bentonite
- Organic bonds e.g. resins
This refractory material is classified into several types based on its bonding:
- Ramming mass: a dry powder that has been pre-made.
- Plastic: a clay dough that resembles resin.
- Castabel: flour that has been melted like cement.
- Mortar: a powder that has been thawed and molded.
- Plaster: a powder that is melted and plastered in the same way that cement is.
The lining is a material that comes into direct contact with metal liquids, posing a significant risk in the event of process and procedure errors during induction furnace operation. As a result, in order to avoid danger, the lining must be strictly controlled.
The main principles of lining
- A layer of heat-resistant material is used to create crucibles.
- This lining quality is critical for function, work safety, smelting metallurgy, and cost efficiency.
Because the lining is an influential material in determining the quality of casting products as well as cost efficiency, several criteria must be considered when selecting lining materials, including:
- Types of metal liquids.
- The temperature of an induction furnace.
- Size of the furnace.
- Continuity of production.
- Costs of production.
That concludes the explanation of induction furnace lining, beginning with the properties of lining, the basic material and binder material of lining, the main principles of lining, and the criteria for selecting a lining material.
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