pitch fiber (C-iPCF). ... the mechanical properties to those of round type mesophase pitch fiber (R-MPCF) and C-type isotropic ... The C-type mesophase pitch-based carbon fiber (C-MPCF) was prepared throuch C-type spinnerette and compared
These properties of modified pitch were dependent on the reforming method (heat or E-beam radiation treatment ... results indicate that novel E-beam radiation reforming is suitable for the preparation of aromatic pitch
carried out on three precursors - a neat pitch and two polymer modified pitches, with a view to find ... system for the production of pitch based carbon fibres. ... A study of partial carbonisation of green pitch fibres to temperatures in the range of 500-1000℃ was
Partial mesophase (PM) pitch precursor was prepared from fluidized catalytic cracking-decant oils (FCC-DO ... The PM pitch heated-treatment at 420℃ for 9 h exhibited the softening point of 297℃ with 23% yield, and ... The PM pitch precursor was melt-spun through circular nozzle by pressurized N2, stabilized at 310℃, carbonized
Pitch-based carbon fiber tows were prepared from naphtha cracking bottom oil by reforming and carbonization ... The carbon contents and the crystallinities of isotropic pitch-based carbon fibers were 86.8~93.8 wt%
Raman spectroscopy ahs been used to investigates the structure of coal tar pitch hear-treated up to 3000 ... Four critical temperature ranges were found on pyrolyzing coal tar pitch, which correspond to four distinct ... treat tem-perature(HTT) below 1000'C corresponds to gas evolution during the pyrolysis of coal tar pitch
Isotropic pitch- based carbon fiber has been activated by steam diluted in nitrogen in to order to ... Isotropic pitch- based carbon fiber has been activated by steam diluted in nitrogen in to order to characterize
탄소섬유는 출발 원료에 따라 polyacrylonitrile(PAN)계, 피치계, 레이온계로 구분할 수 있다[1-3]. PAN이나 피치로부터 제조된 탄소섬유는 우수한 인장강도, 전기, 열전도도 등의 뛰어난 물리 화학적 특성에 의해 여러 고성능, 고기능 재료로 이용되고 ..
Ⅰ. 서론 Ⅱ. 본론 프로펠러의 정의 ⅰ. 프로펠러 재료 ⅱ. 고정 및 가변 피치 프로펠러 ⅲ. 피치의 변경 원동력 Ⅲ. 결론 Ⅰ. 서론 우리가 아는 항공기는 모두 프로펠러를 가지고 있다. 하지만 정확히 어떠한 프로펠러가 있고, 어떤 방법으로 작동되는 지는 대게 자세..
Activated carbons (ACs) were prepared by activation of coal tar pitch (CTP) in the range of 700°C-1000 ... performance of the electric double-layer capacitor electrode, various mixtures of CTP and petroleum pitch
because it exhibits much higher coke yield than coal tar pitch. ... It has been known that the pitches may cause swolling problem during the carbonization process. ... In this study, AR (aromatic resin) pitch was employed as the matrix-precursor for carbon/carbon composite
Isotropic pitch fibers were stabilized and carbonized for preparing carbon fibers. ... structure of the carbon fibers, indicating the limit of developing an ordered structure of isotropic pitch-based
To manufacture a carbon/carbon composite the coal tar pitch was used as the matrix precursor and the ... To manufacture a carbon/carbon composite the coal tar pitch was used as the matrix precursor and the ... is an ideal temperature forthe moderate growth of the mesophase nucleus that forms within the molten pitch
A study of partial carbonisation of green pitch fibers to temperatyres in the range of 500-1000℃ was ... A study of partial carbonisation of green pitch fibers to temperatyres in the range of 500-1000℃ was ... carried out on three precursors-a near and two polymer modified pitches, with a view to find out a suitable
Cokes coated with pitch were obtained by the heat treatment of mixture of cokes and pitch with different ... Petroleum pitch and coke with wet mixture method or with dry mixture method were investigated to develop ... and 80 wt% of coke showed the higher power capability and initial efficiency than the pitch based anode