国产又黄又爽又湿的免费网站_国产毛片AV一区二区三区_无码gogo大胆啪啪艺术_美专家看爱啪网亚洲影视

石(shi)(shi)墨(mo)(mo)(mo)(mo)坩(gan)(gan)堝(guo)(guo)和(he)(he)行(xing)動的(de)(de)(de)類(lei)(lei)型(xing)(xing) 石(shi)(shi)墨(mo)(mo)(mo)(mo)坩(gan)(gan)堝(guo)(guo)作(zuo)為(wei)主(zhu)(zhu)要(yao)可(ke)(ke)(ke)以(yi)用(yong)于(yu)研究金(jin)(jin)(jin)屬(shu)(shu)結構(gou)材料(liao)的(de)(de)(de)熔(rong)融，它(ta)(ta)分人(ren)造石(shi)(shi)墨(mo)(mo)(mo)(mo)質(zhi)(zhi)和(he)(he)天(tian)(tian)然石(shi)(shi)墨(mo)(mo)(mo)(mo)質(zhi)(zhi)兩類(lei)(lei)。石(shi)(shi)墨(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)主(zhu)(zhu)要(yao)以(yi)石(shi)(shi)油焦、針狀(zhuang)焦為(wei)原料(liao)，煤瀝(li)青(qing)作(zuo)結合劑(ji)(ji)，經(jing)煅燒(shao)、配料(liao)、混捏、壓型(xing)(xing)、焙燒(shao)、石(shi)(shi)墨(mo)(mo)(mo)(mo)化、機(ji)加(jia)(jia)工(gong)而(er)制成，是在電(dian)(dian)(dian)弧(hu)爐中以(yi)電(dian)(dian)(dian)弧(hu)形(xing)式(shi)釋放電(dian)(dian)(dian)能對(dui)爐料(liao)進(jin)行(xing)加(jia)(jia)熱(re)(re)熔(rong)化的(de)(de)(de)導體(ti)，根據其質(zhi)(zhi)量(liang)(liang)(liang)指標高(gao)(gao)(gao)(gao)(gao)低，可(ke)(ke)(ke)分為(wei)普通(tong)功(gong)(gong)(gong)率(lv)(lv)(lv)(lv)、高(gao)(gao)(gao)(gao)(gao)功(gong)(gong)(gong)率(lv)(lv)(lv)(lv)和(he)(he)超高(gao)(gao)(gao)(gao)(gao)功(gong)(gong)(gong)率(lv)(lv)(lv)(lv)。石(shi)(shi)墨(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)主(zhu)(zhu)要(yao)包括(kuo)普通(tong)功(gong)(gong)(gong)率(lv)(lv)(lv)(lv)石(shi)(shi)墨(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)、抗氧化涂(tu)層(ceng)石(shi)(shi)墨(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)、高(gao)(gao)(gao)(gao)(gao)功(gong)(gong)(gong)率(lv)(lv)(lv)(lv)石(shi)(shi)墨(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)以(yi)及(ji)超高(gao)(gao)(gao)(gao)(gao)功(gong)(gong)(gong)率(lv)(lv)(lv)(lv)石(shi)(shi)墨(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)四類(lei)(lei)。石(shi)(shi)墨(mo)(mo)(mo)(mo)棒(bang)常用(yong)于(yu)高(gao)(gao)(gao)(gao)(gao)溫(wen)(wen)真(zhen)(zhen)空(kong)爐的(de)(de)(de)電(dian)(dian)(dian)熱(re)(re)體(ti)，最(zui)高(gao)(gao)(gao)(gao)(gao)使(shi)用(yong)溫(wen)(wen)度(du)可(ke)(ke)(ke)達(da)3000℃，在高(gao)(gao)(gao)(gao)(gao)溫(wen)(wen)下易于(yu)氧化，除真(zhen)(zhen)空(kong)外，只能在中性氣(qi)(qi)氛或還原性氣(qi)(qi)氛中使(shi)用(yong)。它(ta)(ta)的(de)(de)(de)熱(re)(re)膨脹系(xi)數較(jiao)(jiao)小(xiao)，熱(re)(re)導率(lv)(lv)(lv)(lv)較(jiao)(jiao)大，電(dian)(dian)(dian)阻系(xi)數為(wei)（8~13）×10-6 Ω·m，加(jia)(jia)工(gong)性較(jiao)(jiao)SiC、MoSi2棒(bang)好，耐高(gao)(gao)(gao)(gao)(gao)溫(wen)(wen)，耐極(ji)(ji)(ji)冷極(ji)(ji)(ji)熱(re)(re)性好，價格(ge)較(jiao)(jiao)便宜。石(shi)(shi)墨(mo)(mo)(mo)(mo)塊一(yi)種(zhong)人(ren)造石(shi)(shi)墨(mo)(mo)(mo)(mo)，而(er)人(ren)造石(shi)(shi)墨(mo)(mo)(mo)(mo)是焦類(lei)(lei)產品(pin)人(ren)工(gong)加(jia)(jia)熱(re)(re)等工(gong)藝制成的(de)(de)(de)。一(yi)般如果提純(chun)做高(gao)(gao)(gao)(gao)(gao)純(chun)，或者(zhe)做碳纖維的(de)(de)(de)話附(fu)加(jia)(jia)值就高(gao)(gao)(gao)(gao)(gao)了(le)。 1)人(ren)造石(shi)(shi)墨(mo)(mo)(mo)(mo)質(zhi)(zhi) 上述天(tian)(tian)然石(shi)(shi)墨(mo)(mo)(mo)(mo)坩(gan)(gan)堝(guo)(guo)一(yi)般含(han)有(you)約(yue)50％的(de)(de)(de)粘(zhan)(zhan)土(tu)(tu)礦物，以(yi)及(ji)人(ren)工(gong)石(shi)(shi)墨(mo)(mo)(mo)(mo)坩(gan)(gan)堝(guo)(guo)的(de)(de)(de)雜質(zhi)(zhi)（灰）小(xiao)于(yu)1％，用(yong)于(yu)精煉高(gao)(gao)(gao)(gao)(gao)純(chun)度(du)金(jin)(jin)(jin)屬(shu)(shu)，以(yi)及(ji)通(tong)過特殊的(de)(de)(de)純(chun)化處理(li)純(chun)度(du)石(shi)(shi)墨(mo)(mo)(mo)(mo)（灰分含(han)量(liang)(liang)(liang)為(wei)20ppm）。常人(ren)造石(shi)(shi)墨(mo)(mo)(mo)(mo)坩(gan)(gan)堝(guo)(guo)以(yi)熔(rong)化少量(liang)(liang)(liang)貴金(jin)(jin)(jin)屬(shu)(shu)和(he)(he)高(gao)(gao)(gao)(gao)(gao)純(chun)度(du)難熔(rong)金(jin)(jin)(jin)屬(shu)(shu)或金(jin)(jin)(jin)屬(shu)(shu)氧化物等的(de)(de)(de)。由于(yu)鋼還通(tong)過氣(qi)(qi)體(ti)坩(gan)(gan)堝(guo)(guo)進(jin)行(xing)分析(xi)。 2)天(tian)(tian)然石(shi)(shi)墨(mo)(mo)(mo)(mo)質(zhi)(zhi) 它(ta)(ta)是以(yi)一(yi)種(zhong)天(tian)(tian)然鱗片狀(zhuang)石(shi)(shi)墨(mo)(mo)(mo)(mo)為(wei)主(zhu)(zhu)要(yao)包括(kuo)原材料(liao)，加(jia)(jia)入各(ge)(ge)種(zhong)粘(zhan)(zhan)土(tu)(tu)及(ji)其它(ta)(ta)建(jian)筑耐火質(zhi)(zhi)原料(liao)可(ke)(ke)(ke)以(yi)制成的(de)(de)(de)，一(yi)般方法(fa)叫(jiao)做粘(zhan)(zhan)土(tu)(tu)以(yi)及(ji)石(shi)(shi)墨(mo)(mo)(mo)(mo)坩(gan)(gan)堝(guo)(guo)，而(er)把以(yi)瀝(li)青(qing)為(wei)粘(zhan)(zhan)結劑(ji)(ji)的(de)(de)(de)叫(jiao)做炭素材料(liao)粘(zhan)(zhan)結劑(ji)(ji)型(xing)(xing)坩(gan)(gan)堝(guo)(guo)，單靠粘(zhan)(zhan)土(tu)(tu)的(de)(de)(de)燒(shao)結力制成的(de)(de)(de)叫(jiao)徽粘(zhan)(zhan)土(tu)(tu)進(jin)行(xing)粘(zhan)(zhan)結劑(ji)(ji)型(xing)(xing)坩(gan)(gan)堝(guo)(guo)，前者(zhe)在強度(du)和(he)(he)抗熱(re)(re)沖擊性方面具有(you)優越。它(ta)(ta)用(yong)于(yu)中國鋼鐵、銅(tong)、銅(tong)合金(jin)(jin)(jin)制造及(ji)其它(ta)(ta)有(you)色內(nei)部金(jin)(jin)(jin)屬(shu)(shu)的(de)(de)(de)熔(rong)解，其大小(xiao)通(tong)過各(ge)(ge)式(shi)各(ge)(ge)類(lei)(lei)各(ge)(ge)樣(yang)，熔(rong)融技術容量(liang)(liang)(liang)從250g到500kg不等。 這種(zhong)坩(gan)(gan)堝(guo)(guo)包括(kuo)撇(pie)渣勺子、蓋(gai)子、鍵合環(huan)、坩(gan)(gan)堝(guo)(guo)支架和(he)(he)攪拌附(fu)件。