MOSI2 Range of Molybdenum Di-Silicide Heater

MOSI2 Heating elements 1800 is a high density material consisting of molybdenum disilicide (MoSi,) and self forming glaze of silicon dioxide (SiO2). It can be used upto Furnace Temperature of 1800°c. These Elements do not age and have a long service life.

The Temperature of around 1200°c the Element becomes ductile. It is brittle at Temperature below 1200°c.

The elements are U shaped and are mostly used suspended with the bottom of the "U" down. The element consists of two cold ends(Lu) and a U-shaped hot section(Le). The cold ends are twice the diameter of the hot section and are attached by a weld. The extremities of cold ends are metallized with aluminium to provide a low-resistance contact area to which the end zones are made with flat braided aluminium straps.

Silcarb manufactur es its MoSi2 Heating Elements by Hot pressing and hot extrusion and also pressure assisted sintering techniques. Silcarb uses Hot isostatic pressing to produces complex shapes, with uniform density and grain structures. The best grade of MoSi2 Heating Elements is capable of operating at temperatures up to 1800℃. However, the material is extremely brittle and can suffer creep from use. Silcarb uses state of the art technology to produce Heating elements that can operate at high electric loads without aging. MoSi2 heating elements are supplied as ready-made elements, and are produced as either straight, bent forms or multi shank elements and in a wide range of dimensions. The elements are used mainly in laboratory furnaces and production furnaces in the glass, electronics, steel, ceramics and heat treatment industries.

Mosi2 Straight Elements

MoSi2 Straight Heating Elements also known as two-shank elements are the most commonly used design. The heating zone is welded to terminals which normally has a diameter double than that of the heating zone. MoSi2 Straight Heating Elements are manufactured to required resistance values. The maximum length of the heating zone depends on the element temperature. The operating temperature is around 1800oC. The same spacing, power ratings, and voltages, used with other molybdenum disilicide elements can be used. Several grades and specific features can be included for used in demanding atmospheres and applications.
Mosi2 cold bent elements

Sometimes the furnace is too tall to allow installation of elements suspended from the roof, this is due to the limitation regarding the maximum permitted heating zone length. So, in such scenarios it is necessary to install elements with bent terminals or heating zones. Most elements are bent in the cold end, but they can also be bent in the hot section. The cold end of the MoSi2 elements can be bent at different angles – 45˚ or 90˚. This allows the installation of several rows of such heating elements on a wall of the furnace and it is also possible to control the power at different levels inside the furnace. Bricks or fiber are used to support the terminals. This usually restricts the maximum furnace temperature to 1600°C (2910°F).
Mosi2 Hot bent elements

In the cases where electrical connections cannot be done above the roof, cold or hot bent heating elements are used. Sometimes the furnace is too tall to allow installation of elements suspended from the roof, this is due to the limitation regarding the maximum permitted heating zone length. So, in such scenarios, it is necessary to install elements with bent terminals or heating zones. Most elements are bent in the cold end, but they can also be bent in the hot section. The MoSi2 hot bent elements have their hot zones bent at 90˚. This allows the installation of several rows of such heating elements on a wall of the furnace and it is also possible to control the power at different levels inside the furnace. To support the terminals, bricks or fibre are used, which restricts the maximum furnace temperature to 1600°C (2910°F).
Mosi2 45^o bent elements

In the cases where electrical connections cannot be done above the roof, bent elements are used. Sometimes the furnace is too high to allow installation of elements suspended from the roof, this is due to the limitation regarding the maximum permitted heating zone length. So, in such scenarios, it is necessary to install elements with bent terminals or heating zones. Most elements are bent in the cold end, but they can also be bent in the hot section. The MoSi2 45˚ bent elements have their cold terminals bent at a 45˚ angle. This allows the installation of several rows of such heating elements on a wall of the furnace and it is also possible to control the power at different levels inside the furnace. The furnace temperature can be limited to 1600°C (2910 ° F) by using bricks or fibres to support the terminals of the furnace.
Mosi2 Four shank elements

In the case of furnaces with low chamber height, the best choice is to use horizontally mounted elements. The four shank heating elements or multi- shank heating elements are advantageous over two shank in a way that the hot zones are longer and therefore only a few elements are needed for heating up the furnace and obtaining the required temperature, with minimal losses at the cold ends. This makes the four-shank elements more economical than its two-shank counterparts. It can be supported from beneath or stapled to high-temperature fibreboard and installed on the wall or roof of the furnace. Four shank elements are used where the maximum element temperature will not exceed 1600°C (2910°F).