carbon fibre

CARBON FIBRE PRODUCTS

PRODUCTS AND ITEMS FOR THERMAL TREATMENT

Thanks to a consolidated and efficient network of international partnerships, Sitec Srl researches and locates the most effective solutions to provide a comprehensive range of state of the art products and top quality technological craftmanship. These include the sale of carbon fibre products reinforced c/c conventional and unconventional composite, manufactured by Across Co. Ltd. From graphite felts to welding tools, from the drum for thermal treatment to the conveyor belt, the c/c conventional composite offers an endless range of advantages:

Excellent resistance to temperatures higher than 1,2OO° C
Low coefficient of thermal expansion
High resistance to thermal shock
Improved abrasion resistance
High resistance combined with lightness
High elasticity modulus
High thermal conductivity
High corrosion resistance
Excellent electrical conductivity
Rapid rise and fall in temperature
Improved fracture resistance

Parallel to the advantageous characteristics, it is, however, well-known that the c/c composite also has various drawbacks such as the lack of regularity of the physical and mechanical properties, its high cost, low resistance to bending and so on.

In order to overcome these shortcomings, Across Co. Ltd has developed and patented an innovative production system of the c/c composite, based on the preparation of the pre-formed fibres with powder binder into a carbon matrix. The compound obtained this way is then placed in thermoplastic hoses which can then be woven like a carpet and introduced hot into an outlet. The result is a c/c composite which, unlike the classic production method, has an exceptional degree of uniformity and very high resistance.

PROPERTIES OF ACROSS' C/C COMPOSITE, COMPARED TO CONVENTIONAL GRAPHITE

		AC 100	AC 200	AC 250	Graphite
Fibre Correlation/ Volume	%	40	40	50	===
Process temperature	°C	2000	2000	2000	2000
Density	g /cm3	1.7	1.7	1.7	1.7
Resistance to curving	Kgf / mm2	8	15	55	4
Resistance to compression	Kgf / mm2	8	10	24	8
Charphy impact level	Kgf / cm / cm2	10	13	53	2
Thermal expansion refering to the length and thickness	10-6 / ° C	2 ===	1.1- 8.4	0.6 - 8.2	4 - 4
Thermal conductivity refering to the length and thickness	Kcal / m hr ° C	15 ===	30 - 11	59 - 9	100 - 100
Specific heat 20° C 1,200° C	cal / g ° C	From 0.18 to 0.49	From 0.18 to 0.47	0.18 - 0.45	0.17- 0.17
Shore Hardness	-	75	81	85	40
Resistivity, volume	n‡ cm	3200	2500	1700	1000

THE EFFECT OF THE HEAT ON THE RESISTANCE

Unlike ceramic and nickel alloy materials, that gradually lose their strength as the temperature increases, the AC 250 Across fibres preserve their resistance constant, even at temperatures higher than 2,000° C.