成人小说亚洲一区二区三区,亚洲国产精品一区二区三区,国产精品成人精品久久久,久久综合一区二区三区,精品无码av一区二区,国产一级a毛一级a看免费视频,欧洲uv免费在线区一二区,亚洲国产欧美中日韩成人综合视频,国产熟女一区二区三区五月婷小说,亚洲一区波多野结衣在线

立即打開
汽車材料革命,碳纖維成新寵

汽車材料革命,碳纖維成新寵

Alex Taylor III 2011-09-08
碳纖維的重量只有鋼鐵的2/3,而強(qiáng)度卻是鋼鐵的5倍。這種神奇的材料在汽車制造業(yè)中正扮演著越來越重要的角色。

????你還記得1967年電影《畢業(yè)生》(The Graduate)中的這段對白嗎?

????麥克尼先生:我只想對你說一個詞,就一個詞。

????本杰明?布拉多克:好的,先生。

????麥克尼先生:你在聽我說嗎?

????本杰明:我聽著呢。

????麥克尼先生:塑料。

????時至今日,如果本杰明還能得到麥克尼的建議,答案很可能就是“碳纖維” —— 一個足以讓他賭上后半生的全新領(lǐng)域。

????碳纖維的重量只有鋼鐵的2/3,而強(qiáng)度卻是鋼鐵的5倍。這種神奇的材料在汽車制造業(yè)中正扮演著越來越重要的角色。如果采用碳纖維大批量生產(chǎn)汽車成為可能,燃油經(jīng)濟(jì)性將會得到顯著改善,而無須依賴新型燃料和新引擎技術(shù)的開發(fā)。因?yàn)橛锰祭w維代替鋼鐵制造汽車將大大減輕車身的整體重量。

????汽車制造商們對這一設(shè)想的可行性深信不疑,并且躍躍欲試。寶馬汽車公司(BMW)就是個典型的例子。上周,寶馬汽車董事局主席諾伯特?雷瑟夫從慕尼黑飛往紐約,參加一個退休晚宴。之后,他又一路向西,長途飛行6,000英里,直奔華盛頓,出席一家碳纖維制造廠的開業(yè)典禮。這家工廠由寶馬和另外一家公司聯(lián)合創(chuàng)辦。對于一項未經(jīng)驗(yàn)證的新技術(shù)來說,雷瑟夫的此次飛行之旅的確可以稱得上是大動干戈。

????首先將細(xì)密的碳纖維絲紡成紗線,并將紗線織成布料。然后,將織成的布料放入模具,加入樹脂使其硬化,于是便制造出這種具有非凡特質(zhì)的新型材料——碳纖維。

????碳纖維不僅用于制造釣魚竿和網(wǎng)球拍,還大量應(yīng)用于飛機(jī)制造業(yè),如夢幻波音噴射客機(jī)787(Boeing 787 Dreamliner)以及一級方程式賽車車體制造。多款高性能汽車,如寶馬M6和雪佛蘭科爾維特(Chevrolet Corvette),車體外板均采用碳纖維材料。不僅如此,它還取代了車內(nèi)裝飾用的薄木板和鋁制材料,成為新的裝飾材料。

????美中不足的是,碳纖維的大規(guī)模應(yīng)用目前還無法實(shí)現(xiàn)。首要的原因就在于這種材料的造價太高。據(jù)估計,一磅碳纖維價值10美元。雖然較之十年前的一磅150美元已經(jīng)便宜了很多,但與一磅鋼鐵的價格相比,仍舊貴了10至20倍。

????另一方面的原因是,碳纖維的制造過程費(fèi)時費(fèi)力,很難實(shí)現(xiàn)大規(guī)模生產(chǎn);而且,其固化時間也需要數(shù)小時。此外,碳纖維無法降解,因此無法循環(huán)再利用。

????這些不利因素并未阻止寶馬進(jìn)軍碳纖維制造領(lǐng)域的步伐。在美國華盛頓州,西雅圖以東180英里處,寶馬正投資1億美元,建設(shè)一家碳纖維制造廠。該廠由寶馬和德國西格里碳素集團(tuán)(SGL Carbon SE)聯(lián)合創(chuàng)辦并經(jīng)營,計劃于本月開始生產(chǎn)碳纖維絲。碳纖維絲隨后將運(yùn)往位于德國的另一家合資企業(yè),加工成輕型纖維織物。

????Remember this exchange from 1967's The Graduate?

????Mr. McGuire: I just want to say one word to you. Just one word.

????Benjamin Braddock: Yes, sir.

????Mr. McGuire: Are you listening?

????Benjamin: Yes, I am.

????Mr. McGuire: Plastics.

????These days, if Ben were to get advice from Mr. McGuire about a new field to stake his future on, the answer could be "carbon fiber."

????The miracle material, two-thirds the weight of steel yet five times stronger, is increasingly finding its way into automobiles. If a means can be found to use it in mass-production vehicles, it would result in dramatically improved fuel economy without resorting to exotic new fuels and engine technologies. Replacing the steel in a car with carbon fiber would shave hundreds of pounds off its weight.

????Automakers are betting they can make it work, BMW in particular. After jetting into New York from Munich last week for a retirement dinner, BMW chairman Norbert Reithofer kept heading west to Washington State, tacking another 6,000 miles onto his trip to open a new factory there co-owned by BMW that manufactures carbon fibers. That's a lot of frequent flyer miles for an unproven technology.

????Carbon fiber consists of thin strands of carbon woven into a yarn that in turn can be made into cloth. The cloth in turn is then laid over a mold and stiffened with resin to produce a sheet of material with remarkable properties.

????Carbon fiber has found its way into fishing rods and tennis rackets, and in larger quantities into airplanes like the Boeing 787 Dreamliner and the bodies of Formula One racecars. A couple of high-end performance cars like the BMW M6 and Chevrolet Corvette have carbon fiber body panels, and the material is used for interior trim in the place of wood veneers or aluminum.

????But high-volume applications have eluded carbon fibers. For one thing, the material is expensive. According to published estimates, carbon fiber costs about $10 a pound. That's a lot cheaper than the $150 a pound it cost a decade ago but still ten to 20 times more than a pound of steel.

????For another, the construction process is laborious and can't easily be scaled up. Curing time can take hours. Moreover, carbon fibers can't be recycled because carbon composites don't corrode.

????That hasn't deterred BMW, which is investing $100 million to build a carbon fiber factory in Washington State, 180 miles east of Seattle. The factory is co-owned and operated by a German company, SGL Carbon SE. Production of carbon fiber thread is starting this month. The fibers will be processed into lightweight fabrics at a second joint venture site in Germany.

掃描二維碼下載財富APP
国产特级毛片AAAAAA高清| 欧美成人性毛片视频| 九九re热久久久久精品| 黄色网站在线观看免费| 性色生活片在线观看| 99久久婷婷国产综合精品电影| 456成人影院在线观看| 日韩一区精品视频在线观看蜜桃| 亚洲成在人线a免费日本免费一区香蕉视频| 人妻无码久久久久久久久久久| 中文字幕高清免费日韩视频在线| 免费视频无遮挡在线观看| 普通话对白国产精品一级毛片| 秋霞鲁丝片Av无码少妇| 羞羞色男人的天堂国产| 乱码卡一卡二新区网站| 无码一区二区免费波多野播放搜索| 在线永久免费观看黄网站| 国产日韩欧美另类视频| 亚洲欧洲国产欧美一区精品| 91麻豆精品国产高清在线| 高潮喷吹精品无码视频一区| 精品人妻系列无码天堂| 97色婷婷成人综合在线观看| 又粗又大内射免费视频小说| 欧美巨大另类极品videosbest| 国产乱码一区二区三区| 亚洲A∨天堂最新地址| 国产大屁股喷水视频在线观看| 色窝窝无码一区二区三区| 夜夜天天狠狠偷偷青青久久| 国产精品色午夜免费观看| 黑人玩弄出轨人妻中文字幕| 抱姝姝a片亚洲综合久久国产| 国产伦精品免编号公布| 荫蒂添的好舒服视频囗交| 日韩无不卡无码毛片| 无码中文字幕人妻在线一区| 色偷偷免费av男人的天堂| 亚洲中文字幕无码永久免弗| 色欲国产麻豆一精品一AV一免费|