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Muffle furnace


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Muffle furnace Parts Construction

Published in: Engineering
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Muffle furnace

  1. 1. 1 Muffle Furnace A muffle furnace is a furnace with an externally heated chamber, the walls of which radiantly heat the contents of the chamber, so that the material being heated has no contact with the flame. Muffle furnaces are most often utilized in laboratories as a compact means of creating extremely high-temperature atmospheres. They are employed to test the characteristics of materials at extremely high and accurate temperatures. A muffle furnace is also known as a retort furnace. CONSTRUCTION OF MUFFLE FURNACE Furnace consists of:  a vented heating chamber  a temperature controller  a door safety switch for operator safety  Horizontal Rectangular light weight with Triple walled construction.  Working Chamber Made of Ceramic with Alumina Muffle  Chamber Made of Mild Steel finished with High Temperature Resistant Aluminum Paint.  Exterior Made of Heavy SWG. Mild Steel Powder coated.  High Dense Insulation Between Two Walls ( Asbestos free)  With Exhaust Pipe fitted with Rear side of the Furnace  High Quality Heating System (Kanthal A-1), Embedded in ceramic Muffle  Long service life  Fully Open able Door System.  Temperature up to Maximum: 16000 C  Temperature Controller: By Microprocessor Based PID Digital Controller.
  2. 2. 2 WORKING OF MUFFLE FURNACE A muffle furnace isapiece of oven-type equipment that can reach high temperatures. It usually works by putting a high-temperature heating coil in an insulated material. The insulating material effectively acts as a muffle, preventing heat from escaping. Furnace is usually heated to desired temperatures by:  Conduction  Convection  Blackbody radiation from electrical-resistance heating elements A precious metal thermocouple senses the temperature in the chamber and transmits this information to the temperature control in millivolts. The control section consists of a temperature controller, a current controller, a transformer, a contactor (relay), a circuit breaker. The temperature controller senses the furnace temperature (by means of the thermocouple) and adjusts electricity to the heating elements by means of the current controller. The current controller controls electricity to the heating elements by adjusting the magnitude of the electrical current (rather than turning the electricity completely on or off). This is the preferred method of controlling electricity to molybdenum disilicide heating elements. When all the necessary work is done and the current is controlled then sample gets heated to the desired temperature and then removed. There is usually no combustion involved in the temperature control of the system, which allows for much greater control of temperature uniformity and assures isolation of the material being heated from the by-products of fuel combustion. Applications It is used for high-temperature applications such as:  Fusing glass  Creating enamel coatings  Ceramics  Soldering  Brazing They are also used in many research facilities, for example by chemists in order to determine what proportion of a sample is non-combustible and non-volatile. Advances in materials for heating elements facilitate more sophisticated metallurgical applications.