ویژگی های کامپوزیت در مقایسه با آلومینیوم، فولاد و چوب به شرح زیر می باشد :
1 – وزن یا چگالی
1- Weight or density: The density of materials made of FRP & GRP composite is equal to 2.1 to 1.85 grams per cubic centimeter.
Comparison :By examining the table below, it can be easily understood that composite materials are lighter than metals. This feature saves on shipping, shipping and installation costs.
|Material||Walnut wood||aluminium||Iron (steel)||Steel||composite|
2 – مقاومت به خوردگی
2 – Corrosion resistance: In terms of the nature of composite materials that are the same as fibers of glass and resin They have high resistance to industrial chemicals and corrosive environments. Depending on the type of resin and fibers used in their production, they are resistant to a wide range of acidic and alkaline materials, even at high temperatures, even under immersion conditions.
Comparison :The conditions of different materials in the table below have been investigated in the field of corrosion.
|Resistance to corrosion and decay||Exposed to galvanic corrosion (requires anodizing and other coatings to prevent corrosion)||Susceptible to oxidation (requires painting or galvanizing)||Resistant to a wide range of chemicals, water, moisture and direct sunlight||Susceptible to rot and warping exposed to moisture, water and chemicals|
3 – مقاومت مکانیکی
3 – Mechanical resistance: The production method, fiber arrangement and type of resin and fibers used in the production of composite parts play a major role in increasing or decreasing its mechanical and structural strength, so that these properties are stronger than the hardest metals.
Comparison :While metals are equally strong in all directions and conditions, composites can be engineered and designed to have higher strengths in a particular direction. When a piece of metal is made and more strength is needed in one direction, the piece usually has to be made thicker, which leads to an increase in weight. Composites are light as well as strong. FRP / GRP composites have the highest strength to weight ratio among today’s structures
4 – مقاومت الکتریکی
4 – Electrical resistance: The electrical resistance of the composite is directly related to the electrical resistance of the materials used in its production. For example, the composite is electrically insulated with fiberglass and electrically conductive with carbon fibers, so this property can be changed depending on the application of the composite part. Excellent electrical insulation is used.
Comparison :The table below compares the electrical resistance of different materials at 20 ° C.
|electrical resistance||28.5 nΩm Electrically conductive||96.1 nΩm Electrically conductive||1 x 1013 nΩm Super electrical insulation||22 Ωm poor electrical insulation|
Sources : https://fa.wikipedia.org
Thermal conductivity:The thermal conductivity of composite materials is very low and this feature has led to its use as thermal insulation, as in the past, glass wool was used to insulate buildings. (The picture below is related to aerogels))
Comparison: The following table shows the electrical conductivity of different elements in terms of a quantity.
|Thermal conductivity||160 W / mC Excellent thermal conductivity||80 W / mC thermal conductor||0.3 W / mC thermal insulation||0.5 W / mC thermal insulation|