Refractory packing

Refractory packing

Refractory packings are a type of refractory material with a rope-like structure with a square cross-section that, like other members of this family, in addition to high heat and cold tolerance and the resulting factors, are also resistant to abrasion and corrosion caused by chemical agents. Are.

Refractory materials with their high resistance to heat, pressure, tension and chemical agents, maintain their durability and form and therefore, are used as an effective and effective insulation to protect the shafts or various other parts. The constituents of refractories are inorganic, non-metallic, porous and heterogeneous, and include oxides of elements such as silicon, aluminum, magnesium, refractories, chromite, bauxite, calcium and zirconium.

Refractory materials with a temperature tolerance of over 1000 degrees Fahrenheit (538 degrees Celsius), which is beyond the heat resistance of various metals, have become popular options and have wide applications in modern products.

In general, the following properties can be considered as the most prominent applications of refractory materials:

Their remarkable function as thermal insulation between the part and the heat conductor
Withstand physical stress and thus prevent wear of parts
Protection against corrosion due to friction or chemical agents
Protection against excessive pressure or tension
Refractory materials can be classified in different ways. One of the common methods of classifying these materials is as follows:

Chemical structure; In this category, three types of refractory materials are acidic (silicon, zirconia, aluminosilicate), base (magnesite, dolomite, magnesium-chromium) and neutral (carbon graphite, chromite, aluminum oxide).
How to build; Refractory materials can be made during the process of dry pressing, melting, manual molding, etc.
melting point; In this group, there are three types of refractory materials, with normal melting point (1580 to 1780 ° C), high melting point (1780 to 2000 ° C) or super melting point (above 2000 ° C).
Resistance; The resistance of refractory materials is in four modes: low, medium, high and super.
Thermal conductivity; Refractory materials are classified into one of three groups: conductive, non-conductive or insulating. The insulating properties of refractory materials are used to reduce the amount of heat lost in the walls of furnaces. Insulating refractory materials are divided into the following four categories:
Thermal insulation; Insulating materials with an operating temperature of less than 1100 ° C
Fireproof; Insulating materials with operating temperature up to 1400 ° C
High refractory; Insulating materials with operating temperature up to 1700 ° C
Above refractory; Insulating materials with operating temperature up to 2000 ° C
From another point of view, refractories often fall into two general categories: first, prefabricated forms or amorphous structures, also known as monolithic refractories; And second, refractory ceramic fibers that are similar to conventional insulation but have a much higher heat tolerance than similar specimens.

Also, refractory materials are available in different shapes and sizes. They can be compressed or molded for use on floors and walls, produced as woven strands, or bent for boilers. Refractory materials are, in some cases, small and have complex dimensions; However, sometimes they are prefabricated blocks weighing several tons.

As mentioned earlier, refractory packings are a branch of refractory materials and have the characteristics listed for them. Refractory packings, in addition to having a high temperature and heat tolerance and the resulting phenomena, are also resistant to abrasion and corrosion caused by chemical agents. Therefore, they can be considered as suitable options to increase productivity in performance. Because these packings, in addition to sealing the equipment, significantly reduce the life of the parts and also reduce energy loss by reducing and almost eliminating friction, thermal insulation and preventing excessive pressure, wear and corrosion. Another advantage of refractory packings is the prevention of leaking cooling water into the equipment. Because different parts, due to friction between the components, are heated and need to be cooled. If proper sealing insulation is not used, water infiltration into equipment parts can lead to serious problems.

Refractory packings, depending on the material and, of course, their predominant characteristics, have different types, each of which makes them more useful in different fields of industries. Among the wide range of these packings, the following can be mentioned:

Types of Teflon refractory packing (pure, oily, etc.); This type of fireproof packing, due to its anti-wear properties, is considered as a suitable option among other competitors.
Graphite refractory packing; The reason for the popularity of this type of fireproof packing is its high heat tolerance. Because in its production, pure graphite has been used.
Aramid refractory packing; The advantage of this type of fireproof packing is its high fiber strength, which has even made it a suitable option for the production of bulletproof vests.
Types of asbestos refractory packing (Teflon, graphite, etc.); The general characteristic of this type of refractory packings is high temperature and pressure tolerance, which varies in different types.
Types of refractory packing (oil, Teflon, etc.); The raw material for the production of this type of refractory packing is a resistant plant, and this gives it good tensile pressure tolerance and resistance.
Fiberglass fireproof packing; This type of refractory packing is a convenient and economical alternative to asbestos, which also has the unique characteristics of other types, such as high pressure and temperature tolerance.
Grease flax refractory packing; Use natural grease This type of fireproof packing makes it easier to shape. On the other hand, the resistance of this type of refractory packages to decay and also its effective performance against saline water, has made this type of refractory packages the best choice for sealing equipment.
Carbon refractory packing; The high coefficient of friction of this type of refractory packing makes it durable at high temperatures. Another advantage of this type of refractory packing is that despite its relatively low weight, it has high strength and tensile strength. Strength that reaches five to ten times the strength of steel.