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應(ying)(ying)(ying)用(yong)(yong)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)是(shi)(shi)什么？ 1、石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)結(jie)構材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)可(ke)(ke)作(zuo)耐(nai)(nai)火材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)：石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)及其(qi)相關制品(pin)企(qi)業(ye)具(ju)(ju)有(you)耐(nai)(nai)高(gao)(gao)(gao)溫(wen)、的(de)(de)(de)性(xing)(xing)(xing)(xing)質(zhi)，在(zai)(zai)(zai)冶(ye)金(jin)(jin)(jin)機械(xie)工(gong)業(ye)中(zhong)(zhong)(zhong)主(zhu)(zhu)要(yao)(yao)(yao)可(ke)(ke)以(yi)(yi)用(yong)(yong)來進(jin)行制造過(guo)程中(zhong)(zhong)(zhong)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)坩堝，在(zai)(zai)(zai)煉(lian)鋼(gang)中(zhong)(zhong)(zhong)常(chang)用(yong)(yong)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)作(zuo)鋼(gang)錠之(zhi)保護(hu)劑，冶(ye)金(jin)(jin)(jin)爐(lu)的(de)(de)(de)內襯(chen)。石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)棒常(chang)用(yong)(yong)于(yu)(yu)高(gao)(gao)(gao)溫(wen)真(zhen)空(kong)爐(lu)的(de)(de)(de)電(dian)(dian)(dian)熱(re)(re)(re)體(ti)(ti)，最高(gao)(gao)(gao)使(shi)(shi)用(yong)(yong)溫(wen)度可(ke)(ke)達3000℃，在(zai)(zai)(zai)高(gao)(gao)(gao)溫(wen)下易于(yu)(yu)氧化(hua)(hua)，除真(zhen)空(kong)外，只能(neng)在(zai)(zai)(zai)中(zhong)(zhong)(zhong)性(xing)(xing)(xing)(xing)氣(qi)氛(fen)或還(huan)(huan)原性(xing)(xing)(xing)(xing)氣(qi)氛(fen)中(zhong)(zhong)(zhong)使(shi)(shi)用(yong)(yong)。它(ta)的(de)(de)(de)熱(re)(re)(re)膨(peng)脹系(xi)數(shu)較(jiao)小，熱(re)(re)(re)導(dao)(dao)率(lv)較(jiao)大(da)，電(dian)(dian)(dian)阻(zu)系(xi)數(shu)為(wei)（8~13）×10-6 Ω·m，加(jia)工(gong)性(xing)(xing)(xing)(xing)較(jiao)SiC、MoSi2棒好(hao)(hao)，耐(nai)(nai)高(gao)(gao)(gao)溫(wen)，耐(nai)(nai)極(ji)(ji)(ji)(ji)(ji)(ji)冷極(ji)(ji)(ji)(ji)(ji)(ji)熱(re)(re)(re)性(xing)(xing)(xing)(xing)好(hao)(hao)，價(jia)格較(jiao)便宜。石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)塊一(yi)(yi)(yi)種(zhong)人(ren)(ren)造石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)，而(er)人(ren)(ren)造石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)是(shi)(shi)焦(jiao)類產(chan)品(pin)人(ren)(ren)工(gong)加(jia)熱(re)(re)(re)等(deng)(deng)(deng)工(gong)藝制成(cheng)的(de)(de)(de)。一(yi)(yi)(yi)般如果提純(chun)(chun)做(zuo)高(gao)(gao)(gao)純(chun)(chun)，或者做(zuo)碳纖維(wei)的(de)(de)(de)話(hua)附加(jia)值就(jiu)高(gao)(gao)(gao)了(le)。石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)主(zhu)(zhu)要(yao)(yao)(yao)以(yi)(yi)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)油焦(jiao)、針狀焦(jiao)為(wei)原料(liao)(liao)，煤瀝青作(zuo)結(jie)合(he)劑，經煅燒、配(pei)料(liao)(liao)、混(hun)捏(nie)、壓型、焙(bei)燒、石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)化(hua)(hua)、機加(jia)工(gong)而(er)制成(cheng)，是(shi)(shi)在(zai)(zai)(zai)電(dian)(dian)(dian)弧爐(lu)中(zhong)(zhong)(zhong)以(yi)(yi)電(dian)(dian)(dian)弧形(xing)式釋放電(dian)(dian)(dian)能(neng)對爐(lu)料(liao)(liao)進(jin)行加(jia)熱(re)(re)(re)熔化(hua)(hua)的(de)(de)(de)導(dao)(dao)體(ti)(ti)，根據其(qi)質(zhi)量(liang)(liang)(liang)指(zhi)標高(gao)(gao)(gao)低，可(ke)(ke)分為(wei)普(pu)通功(gong)率(lv)、高(gao)(gao)(gao)功(gong)率(lv)和(he)(he)(he)(he)(he)超高(gao)(gao)(gao)功(gong)率(lv)。石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)主(zhu)(zhu)要(yao)(yao)(yao)包括普(pu)通功(gong)率(lv)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)、抗氧化(hua)(hua)涂(tu)層石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)、高(gao)(gao)(gao)功(gong)率(lv)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)以(yi)(yi)及超高(gao)(gao)(gao)功(gong)率(lv)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)四類。 2.石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)可(ke)(ke)用(yong)(yong)作(zuo)導(dao)(dao)電(dian)(dian)(dian)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)：用(yong)(yong)于(yu)(yu)電(dian)(dian)(dian)氣(qi)行業(ye)制作(zuo)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)，電(dian)(dian)(dian)刷，碳棒，碳管(guan)，汞正極(ji)(ji)(ji)(ji)(ji)(ji)，石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)墊圈，電(dian)(dian)(dian)話(hua)部(bu)件(jian)，電(dian)(dian)(dian)視(shi)顯(xian)像管(guan)涂(tu)層等(deng)(deng)(deng).. 圖3。 石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)可(ke)(ke)用(yong)(yong)作(zuo)耐(nai)(nai)磨(mo)潤(run)滑(hua)(hua)(hua)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao): 石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)在(zai)(zai)(zai)機械(xie)工(gong)業(ye)中(zhong)(zhong)(zhong)常(chang)用(yong)(yong)作(zuo)潤(run)滑(hua)(hua)(hua)劑。 潤(run)滑(hua)(hua)(hua)油不能(neng)在(zai)(zai)(zai)高(gao)(gao)(gao)速(su)(su)、高(gao)(gao)(gao)溫(wen)、高(gao)(gao)(gao)壓下使(shi)(shi)用(yong)(yong)，但(dan)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)耐(nai)(nai)磨(mo)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)在(zai)(zai)(zai)200ー2000 °c 高(gao)(gao)(gao)速(su)(su)滑(hua)(hua)(hua)動(dong)(dong)時(shi)不需要(yao)(yao)(yao)潤(run)滑(hua)(hua)(hua)油即(ji)可(ke)(ke)工(gong)作(zuo)。許(xu)多(duo)腐蝕(shi)(shi)性(xing)(xing)(xing)(xing)介質(zhi)輸送設備(bei)，廣泛使(shi)(shi)用(yong)(yong)活塞(sai)杯、密(mi)封件(jian)和(he)(he)(he)(he)(he)軸承等(deng)(deng)(deng)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)，無需添加(jia)潤(run)滑(hua)(hua)(hua)油操作(zuo)。 石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)乳也是(shi)(shi)許(xu)多(duo)金(jin)(jin)(jin)屬加(jia)工(gong)拉(la)絲和(he)(he)(he)(he)(he)拉(la)拔管(guan)的(de)(de)(de)良(liang)好(hao)(hao)潤(run)滑(hua)(hua)(hua)劑。 4.石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)可(ke)(ke)具(ju)(ju)有(you)良(liang)好(hao)(hao)的(de)(de)(de)化(hua)(hua)學(xue)穩(wen)定性(xing)(xing)(xing)(xing)。石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)特(te)殊處(chu)(chu)理，耐(nai)(nai)腐蝕(shi)(shi)性(xing)(xing)(xing)(xing)，熱(re)(re)(re)傳導(dao)(dao)性(xing)(xing)(xing)(xing)，和(he)(he)(he)(he)(he)低滲透(tou)性(xing)(xing)(xing)(xing)抗性(xing)(xing)(xing)(xing)后，它(ta)被(bei)大(da)量(liang)(liang)(liang)用(yong)(yong)于(yu)(yu)生(sheng)產(chan)的(de)(de)(de)熱(re)(re)(re)交換器中(zhong)(zhong)(zhong)，一(yi)(yi)(yi)個反(fan)(fan)應(ying)(ying)(ying)罐(guan)，冷凝器，一(yi)(yi)(yi)個燃(ran)燒塔，吸收塔，冷卻器，加(jia)熱(re)(re)(re)器，過(guo)濾器的(de)(de)(de)泵設備(bei)。在(zai)(zai)(zai)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)化(hua)(hua)，濕(shi)法冶(ye)金(jin)(jin)(jin)，酸(suan)和(he)(he)(he)(he)(he)堿(jian)的(de)(de)(de)生(sheng)產(chan)，合(he)成(cheng)纖維(wei)，紙等(deng)(deng)(deng)工(gong)業(ye)部(bu)門(men)廣泛使(shi)(shi)用(yong)(yong)，可(ke)(ke)以(yi)(yi)節省大(da)量(liang)(liang)(liang)的(de)(de)(de)金(jin)(jin)(jin)屬材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)。 不透(tou)性(xing)(xing)(xing)(xing)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)的(de)(de)(de)品(pin)種(zhong)因自身所(suo)含(han)各種(zhong)樹(shu)(shu)脂進(jin)行不同(tong)，耐(nai)(nai)蝕(shi)(shi)性(xing)(xing)(xing)(xing)也有(you)一(yi)(yi)(yi)定差異(yi)(yi)。如酚醛(quan)樹(shu)(shu)脂浸漬(zi)(zi)者耐(nai)(nai)酸(suan)，但(dan)不使(shi)(shi)用(yong)(yong)耐(nai)(nai)堿(jian);糠醇樹(shu)(shu)脂浸漬(zi)(zi)者既耐(nai)(nai)酸(suan)，又耐(nai)(nai)堿(jian)。不同(tong)產(chan)品(pin)品(pin)種(zhong)的(de)(de)(de)耐(nai)(nai)熱(re)(re)(re)性(xing)(xing)(xing)(xing)方(fang)面(mian)也有(you)很大(da)差異(yi)(yi)：碳和(he)(he)(he)(he)(he)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)在(zai)(zai)(zai)還(huan)(huan)原性(xing)(xing)(xing)(xing)氣(qi)氛(fen)中(zhong)(zhong)(zhong)可(ke)(ke)耐(nai)(nai)2000~3000℃，在(zai)(zai)(zai)氧化(hua)(hua)環境氣(qi)氛(fen)比較(jiao)中(zhong)(zhong)(zhong)分別(bie)在(zai)(zai)(zai)350℃和(he)(he)(he)(he)(he)400℃開始通過(guo)氧化(hua)(hua);不透(tou)性(xing)(xing)(xing)(xing)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)品(pin)種(zhong)隨浸漬(zi)(zi)劑而(er)異(yi)(yi)，一(yi)(yi)(yi)般由酚醛(quan)或糠醇浸漬(zi)(zi)者耐(nai)(nai)熱(re)(re)(re)在(zai)(zai)(zai)180℃以(yi)(yi)下。 的(de)(de)(de)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)可(ke)(ke)以(yi)(yi)是(shi)(shi)鑄造，鑄造，模(mo)具(ju)(ju)和(he)(he)(he)(he)(he)高(gao)(gao)(gao)溫(wen)冶(ye)金(jin)(jin)(jin)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)：，它(ta)可(ke)(ke)以(yi)(yi)被(bei)用(yong)(yong)作(zuo)模(mo)具(ju)(ju)的(de)(de)(de)玻璃過(guo)濾器，使(shi)(shi)用(yong)(yong)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)，得到黑色金(jin)(jin)(jin)屬鑄件(jian)尺寸石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)由于(yu)(yu)熱(re)(re)(re)膨(peng)脹系(xi)數(shu)，和(he)(he)(he)(he)(he)耐(nai)(nai)熱(re)(re)(re)沖擊到變化(hua)(hua)耐(nai)(nai)精度，表面(mian)平滑(hua)(hua)(hua)產(chan)量(liang)(liang)(liang)高(gao)(gao)(gao)，它(ta)可(ke)(ke)以(yi)(yi)在(zai)(zai)(zai)不處(chu)(chu)理或通過(guo)較(jiao)小的(de)(de)(de)處(chu)(chu)理中(zhong)(zhong)(zhong)使(shi)(shi)用(yong)(yong)，從而(er)節約(yue)了(le)大(da)量(liang)(liang)(liang)的(de)(de)(de)金(jin)(jin)(jin)屬。硬質(zhi)合(he)金(jin)(jin)(jin)粉末(mo)冶(ye)金(jin)(jin)(jin)工(gong)藝的(de)(de)(de)生(sheng)產(chan)，通常(chang)為(wei)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)燒結(jie)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)模(mo)和(he)(he)(he)(he)(he)瓷(ci)舟。單晶硅晶體(ti)(ti)生(sheng)長坩堝中(zhong)(zhong)(zhong)，區域精煉(lian)容器，支(zhi)承夾(jia)具(ju)(ju)，感應(ying)(ying)(ying)加(jia)熱(re)(re)(re)器，等(deng)(deng)(deng)與高(gao)(gao)(gao)純(chun)(chun)度的(de)(de)(de)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)進(jin)行處(chu)(chu)理。進(jin)一(yi)(yi)(yi)步真(zhen)空(kong)冶(ye)煉(lian)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)可(ke)(ke)以(yi)(yi)制備(bei)和(he)(he)(he)(he)(he)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)隔熱(re)(re)(re)，耐(nai)(nai)高(gao)(gao)(gao)溫(wen)爐(lu)管(guan)，棒，板，棚等(deng)(deng)(deng)細胞(bao)成(cheng)分的(de)(de)(de)基板。 6、石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)結(jie)構材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)可(ke)(ke)用(yong)(yong)于(yu)(yu)原子(zi)能(neng)工(gong)業(ye)和(he)(he)(he)(he)(he)國防建設工(gong)業(ye)：石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)進(jin)行具(ju)(ju)有(you)一(yi)(yi)(yi)個良(liang)好(hao)(hao)的(de)(de)(de)中(zhong)(zhong)(zhong)子(zi)減速(su)(su)劑用(yong)(yong)于(yu)(yu)研究(jiu)原子(zi)反(fan)(fan)應(ying)(ying)(ying)堆(dui)中(zhong)(zhong)(zhong)，鈾一(yi)(yi)(yi)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)反(fan)(fan)應(ying)(ying)(ying)堆(dui)是(shi)(shi)應(ying)(ying)(ying)用(yong)(yong)問題較(jiao)多(duo)的(de)(de)(de)一(yi)(yi)(yi)種(zhong)有(you)效原子(zi)反(fan)(fan)應(ying)(ying)(ying)堆(dui)。作(zuo)為(wei)主(zhu)(zhu)要(yao)(yao)(yao)動(dong)(dong)力用(yong)(yong)的(de)(de)(de)原子(zi)能(neng)反(fan)(fan)應(ying)(ying)(ying)堆(dui)中(zhong)(zhong)(zhong)的(de)(de)(de)減速(su)(su)材(cai)(cai)(cai)(cai)(cai)料(liao)(liao)我(wo)們應(ying)(ying)(ying)當更(geng)加(jia)具(ju)(ju)有(you)高(gao)(gao)(gao)熔點(dian)，穩(wen)定，耐(nai)(nai)腐蝕(shi)(shi)的(de)(de)(de)性(xing)(xing)(xing)(xing)能(neng)，石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)完(wan)全不同(tong)可(ke)(ke)以(yi)(yi)得到滿足企(qi)業(ye)上述技術要(yao)(yao)(yao)求(qiu)。作(zuo)為(wei)社會原子(zi)反(fan)(fan)應(ying)(ying)(ying)堆(dui)用(yong)(yong)的(de)(de)(de)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)墨(mo)(mo)(mo)(mo)(mo)(mo)(mo)純(chun)(chun)度要(yao)(yao)(yao)求(qiu)不是(shi)(shi)很高(gao)(gao)(gao)，雜質(zhi)含(han)量(liang)(liang)(liang)不應(ying)(ying)(ying)超過(guo)幾十個PPM 。特(te)別(bie)是(shi)(shi)對于(yu)(yu)其(qi)中(zhong)(zhong)(zhong)硼(peng)含(han)量(liang)(liang)(liang)應(ying)(ying)(ying)少于(yu)(yu)0.5PPM 。