The muffle furnace is device by means of which it is possible to heat various materials. At the same time heating temperature is individual depending on material and its purpose. The feature of the furnace consists available the muffle. This element of the device protects material from contact with fuel, gases. Besides, is the main working site of the muffle furnace.
It is required to you
- cardboard, paraffin, clay, the muffle furnace, file, emery paper, nikhromovy wire, PEV wire, the metal body, plate from stainless steel
Instruction
1. The working chamber is manufactured, as a rule, of refractory clay. It is simple to mold the muffle by means of form. Take cardboard. Impregnate it with paraffin or stearin. Such measure will help to avoid sticking of form.
2. From within form apply clay. At the same time thickness of layer should not be more than 10 mm. Also mold door. Parts have to dry out therefore leave them on air.
3. Place the dried elements from clay in the muffle furnace which can be found in normal school and finally dry. It is necessary to dry at temperature of 100 °C about two hours. Further it is necessary to make roasting of parts.
4. Switch off the furnace and let's parts cool down, without extracting from the furnace. Adjust the muffle and door the friend to the friend by means of file and emery paper.
5. Take the 18th meter nikhromovy wire 0.75 mm thick, wire of PEV 0.8-0.9 and reel up from above on the muffle. The first and last round should be truncated and twirled. It will not allow winding to be untwisted. Remove PEV wire.
6. To avoid short circuit, miss the mark gaps between rounds with clay. After clay dries up, impose the second layer of the clay displaced with asbestos crumb. Thickness of the second layer – 12 mm. Dry up the muffle.
7. Manufacture the metal body, 270X200X180 mm in size. Place in it the ready muffle. For more comfortable use, the body should be equipped with the removable front and back covers fixed on screws.
8. On front cover fix door. The door has to lean back horizontally. On door install the ceramic muffle. Close up gaps clay.
9. You will remove the ends of wire to back cover of the body, and isolate them by means of ceramic beads. Attach wire to the pin connector to which connect cord with fork for connection to network.
10. Hammer space between the body and heating coils with asbestos crumb. Work with the muffle furnace will easier take place if on back wall and on door to make openings. The opening behind is necessary for installation of the thermocouple, on door – for control over working process. On bottom of the furnace put plate from thin stainless steel, no more than 0.8 mm thick.