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簡單的介紹一種高技法花費(fèi)工藝,那是剛玉耐磨陶瓷管的自蔓燃低溫離合解體法制造。該管從內(nèi)到外分別由剛玉陶瓷、過渡層、鋼構(gòu)成,陶瓷層是在二千二百攝氏度以上超高溫構(gòu)成的致密剛玉瓷,陶瓷同鋼軌通過過渡層構(gòu)成結(jié)子的聯(lián)合。
首先將無縫鋼軌放到離心計(jì)的管模內(nèi),在鋼軌模內(nèi)。在鋼軌內(nèi)加入鐵橘紅和鋁粉混合物,這種混合物是所說的鋁熱劑。當(dāng)離心計(jì)管模自轉(zhuǎn)到達(dá)一定的速率后,經(jīng)一火星撲滅鋁熱劑,鋁熱劑立即本身熄滅,熄滅波快速滋蔓,在滋蔓時(shí)出現(xiàn)化工反應(yīng)。
鋁熱劑反應(yīng)生成物為穩(wěn)定型剛玉和鐵,并釋放出少許熱量。這些熱量如果是在絕熱要求下,絕熱氣溫可到達(dá)三千七百五十七K和三千五百零九K,它使鋼軌內(nèi)本來物料以及反應(yīng)后的生成物,等于熔點(diǎn)為二千零四十五攝氏度的剛玉也都全部變?yōu)槿垡?。由于反?yīng)十分快速,熔融反應(yīng)在向心力的效用下,鐵的比例為剛玉瓷比例的2倍,較輕的剛玉瓷則散播在鐵的內(nèi)層,較重的鐵被向心力甩到鋼軌內(nèi)壁。
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中譯英:
Piezoelectric ceramic is mainly used for manufacturing the ultrasonic transducer, transducer, transducer, ceramic filters, ceramic, ceramic discriminator transformer, high voltage generator, an infrared detector, surface acoustic wave device, electro-optic device, ignition and detonation device and piezoelectric gyro.
Piezoelectric ceramic manufacture characteristic in ferroelectric ceramics under DC electric field on the polarization, so it has a piezoelectric effect. General polarized electric field is 3 ~ 5kV/mm, temperature 100~ 150° C, 5 ~20min. These three are the main factors affecting polarization effect. Better performance of the piezoelectric ceramics, such as lead zirconate titanate system ceramic, the electromechanical coupling coefficient can be up to 0.313~ 0.694.