Basic knowledge and performance inspection of carbon fiber cloth

With the rapid development of modern technologies such as aerospace, missiles, atomic energy, automobile industry, construction engineering, etc., the existing steel and alloy materials have been difficult to meet the requirements. The advantages of strength, carbon fibers and their composites have played a very broad role in various fields of social construction and development.

1.what is carbon fiber cloth

Carbon fiber cloth is also known as carbon fiber cloth, carbon fiber cloth, carbon fiber woven cloth, carbon fiber prepreg cloth, carbon fiber reinforcement cloth, carbon cloth, carbon fiber fabric, carbon fiber tape, carbon fiber sheet (prepreg cloth), etc. Carbon fiber cloth is a unidirectional carbon fiber reinforced product. It is usually woven with 12K carbon fiber. The common thicknesses are 0.111mm (200g) and 0.167mm (300g), and the widths are 100mm, 150mm, 200mm, 300mm, 500mm and others. Special width required for the project.

2.the classification of carbon fiber cloth

The types of carbon fiber sheets vary according to their carbon fiber precursors, specifications, carbonization and weaving methods:

1. Classification by carbon fiber precursor

   It can be divided into PAN-based carbon fiber cloth (more than 90% of the market is this kind of carbon fiber cloth), viscose-based carbon fiber cloth and pitch-based carbon fiber cloth.

   
   

   
   

2. According to carbon fiber specifications

   It can be divided into 1K carbon fiber cloth, 3K carbon fiber cloth, 6K carbon fiber cloth, 12K carbon fiber cloth, 24K and above large tow carbon fiber cloth.

   
   

   
   

3. According to carbon fiber carbonization

   It can be divided into graphitized carbon fiber cloth (can withstand high temperature of 2000-3000 degrees), carbon fiber cloth (can withstand high temperature of about 1000 degrees), and pre-oxidized carbon fiber cloth (can withstand high temperature of 200-300 degrees).

   
   

4. According to the weaving method

   It can be divided into woven carbon fiber cloth (mainly: plain weave, twill, satin cloth, unidirectional cloth, etc.), knitted carbon fiber cloth (mainly: warp knitted cloth, weft knitted cloth, circular knitted cloth (casing), horizontal Machine cloth (ribbed cloth, etc.), woven carbon fiber cloth (mainly: casing, packing, braided tape, two-dimensional cloth, three-dimensional cloth, three-dimensional woven cloth, etc.), carbon fiber prepreg cloth (mainly: dry prepreg cloth, wet prepreg, unidirectional prepreg, prepreg tape, without support, with support, etc.), carbon fiber non-woven fabric (non-woven fabric, namely carbon fiber felt, carbon felt, including chopped strand mat, continuous felt, surface felt, needled felt, stitched felt, etc.).

3. Performance inspection of carbon fiber cloth

Carbon fiber cloth has a variety of specifications and varieties, with different properties, excellent heat resistance, semiconductivity, electrical conductivity and chemical resistance, and mechanical properties are related to the carbon filaments used and the weaving method. At present, the most important indicators to measure the mechanical properties of high-performance carbon fiber cloth are its strength, elastic modulus and elongation at break. With the increasing number of reinforced projects using the technology of pasting carbon fiber cloth, the acceptance of the construction quality of such projects is being standardized, and more and more owners are no longer satisfied with the product qualification certificate provided by the construction unit. The carbon fiber cloth and its supporting resin used in the field sampling inspection.

However, the mechanical property testing of carbon fiber cloth is much more difficult than other low-strength fiber materials, and it has high requirements on the clamping ability of the end of the sample, the uniform force of the fiber filaments, and the alignment performance of the testing machine. It is worth noting that the carbon fiber cloth will not be permanently bent, and if it is bent too much, it may break, so it should be handled with care when using the carbon fiber cloth!