CARBON FIBRE

Carbon-fibre products

HEAT TREATMENT ARTEFACTS AND ITEMS

Sitec Srl, through a well-established and efficient network of international partnerships, is involved in researching and sourcing the most effective solutions, offering a complete range of cutting-edge and technologically advanced products. Among these, it supplies reinforced carbon fibre products, both conventional and non-conventional composites, manufactured by Across Co. Ltd. From graphite felts to brazing tools, from heat treatment baskets to conveyor belts, conventional composites offer numerous advantages such as:

Excellent temperature resistance above 12OO°C

Low thermal expansion coefficient

High resistance to thermal shock

Improved abrasion resistance

High resistance combined with light weight

High modulus of elasticity

High thermal conductivity

High resistance to corrosion

Excellent electrical conductivity

Rate of temperature rise and fall

Improved fracture resistance

Alongside the advantageous characteristics, it is well known that composite materials also present several drawbacks, such as inconsistency in physical and mechanical properties, high cost, low bending resistance, and so forth.

To address these shortcomings, Across Co Ltd has developed and patented an innovative production system for composite materials, based on the preparation of preformed fibres with a powdered binder in a carbon matrix. The resulting composite is placed into thermoplastic sleeves, which are then woven like a mat and introduced into a hot press. This process yields a composite material that, unlike traditional production methods, offers exceptional uniformity and extremely high resistance.

PROPERTIES OF ACROSS COMPOSITE COMPARED TO CONVENTIONAL GRAPHITE

	AC 100	AC 200	AC 250	GRAFITE
Fibre/Volume Ratio (%)	40	40	50	===
Process Temperature (°C)	2000	2000	2000	2000
Density (g/cm³)	1,7	1,7	1,7	1,7
Flexural Strength (Kgf/mm²)	8	15	55	4
Flexural Strength (Kgf/mm²)	8	10	24	8
Charpy Resilience Value (Kgf/cm/cm²)	10	13	53	2
Thermal Expansion Relative to Length and Thickness (10⁻⁶/°C)	2 ===	1,1- 8,4	0,6 - 8,2	4 - 4
Thermal Conductivity Relative to Length and Thickness (Kcal/m hr °C)	15 ===	30 - 11	59 - 9	100 - 100
Specific Heat 20°C - 1200°C (cal/g °C)	0,18 - 0,49	0,18 - 0,47	0,18 - 0,45	0,17- 0,17
Shore Hardness	75	81	85	40
Volume Resistivity (Ω·cm)	3200	2500	1700	1000

EFFECT OF HEAT ON RESISTANCE

Unlike ceramic materials and nickel alloys, which lose their resistance with increasing temperature, Across AC 250 fibres maintain their resistance even at temperatures exceeding 2000°C.

EFFECT OF HEAT ON FLEXURAL STRENGTH

The flexural strength, in relation to the load, remains unchanged even over long periods, without being affected by temperature.