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离心计心情常识
离心计心情外部与它熔体温度的接洽干系
   来历:bb贝博平台登录:长沙普通离心计心情   时候2014-5-26    点击:4461

  当离(li)(li)心计心情不(bu)转时(shi),跟着温(wen)度梯(ti)度增(zeng)大(da),锡(xi)熔体(ti)(ti)(ti)中(zhong)温(wen)度从无脉(mai)动(dong)到周期性(xing)脉(mai)动(dong),后为(wei)无法则脉(mai)动(dong),幅值较(jiao)着增(zeng)大(da)当温(wen)度梯(ti)度约(yue)(yue)为(wei)时(shi),脉(mai)动(dong)幅值约(yue)(yue)士,离(li)(li)心计心情动(dong)弹(dan)后,两种扭转体(ti)(ti)(ti)例正转与反转都进(jin)步了,此(ci)中(zhong)是(shi)(shi)离(li)(li)心加速率,是(shi)(shi)重力(li)加速率,增(zeng)强(qiang)了熔体(ti)(ti)(ti)中(zhong)的对流(liu),增(zeng)进(jin)熔体(ti)(ti)(ti)中(zhong)传热传质的停(ting)止,测得温(wen)度梯(ti)度都是(shi)(shi)下降(jiang)的但温(wen)度脉(mai)动(dong)变更趋向却截(jie)然(ran)差别离(li)(li)心计心情正转时(shi),测得一组(zu)温(wen)度脉(mai)动(dong)曲线。

  脉动(dong)(dong)(dong)值(zhi)大(da)大(da)下降(jiang)离心(xin)(xin)计(ji)心(xin)(xin)情反(fan)(fan)(fan)转(zhuan)(zhuan)时(shi),温度(du)(du)(du)(du)脉动(dong)(dong)(dong)曲线见(jian)图脉动(dong)(dong)(dong)幅值(zhi)打随。增大(da)而增大(da),同时(shi)脉动(dong)(dong)(dong)频(pin)次也增添那时(shi),占(zhan)值(zhi)比离心(xin)(xin)计(ji)心(xin)(xin)情不(bu)转(zhuan)(zhuan)时(shi)增大(da)不(bu)管离心(xin)(xin)计(ji)心(xin)(xin)情正(zheng)转(zhuan)(zhuan)仍是(shi)反(fan)(fan)(fan)转(zhuan)(zhuan),对(dui)统一个值(zhi),熔(rong)(rong)体(ti)(ti)遭(zao)(zao)到的(de)(de)向心(xin)(xin)力(li)都是(shi)一样的(de)(de),但力(li)标的(de)(de)目的(de)(de)却相反(fan)(fan)(fan)单(dan)元品质熔(rong)(rong)体(ti)(ti)质点(dian)遭(zao)(zao)到力(li)。,此中。是(shi)离心(xin)(xin)计(ji)心(xin)(xin)情动(dong)(dong)(dong)弹角(jiao)速(su)率(lv),是(shi)熔(rong)(rong)体(ti)(ti)质点(dian)的(de)(de)活(huo)动(dong)(dong)(dong)速(su)率(lv)绝(jue)对(dui)离心(xin)(xin)计(ji)心(xin)(xin)情,角(jiao)速(su)率(lv)。程度(du)(du)(du)(du)舟内(nei)熔(rong)(rong)体(ti)(ti)的(de)(de)活(huo)动(dong)(dong)(dong)首要(yao)是(shi)由(you)程度(du)(du)(du)(du)温差引发的(de)(de)天(tian)然对(dui)流(liu),活(huo)动(dong)(dong)(dong)状(zhuang)况由(you)数决议,。此中夕是(shi)体(ti)(ti)积(ji)收(shou)缩(suo)系数,是(shi)舟的(de)(de)长度(du)(du)(du)(du),是(shi)活(huo)动(dong)(dong)(dong)粘性(xing)系数,当比拟小时(shi),熔(rong)(rong)体(ti)(ti)内(nei)活(huo)动(dong)(dong)(dong)如图所示,当,大(da)到必(bi)然值(zhi),就会呈现多个胞状(zhuang)环流(liu),但这些胞状(zhuang)活(huo)动(dong)(dong)(dong)炉(lu)1膛温度(du)(du)(du)(du)坚持(chi)不(bu)变,差别离心(xin)(xin)计(ji)心(xin)(xin)情转(zhuan)(zhuan)速(su)下的(de)(de)温度(du)(du)(du)(du)脉动(dong)(dong)(dong)记实为正(zheng)转(zhuan)(zhuan),为反(fan)(fan)(fan)转(zhuan)(zhuan)。

  离(li)(li)心计心情正转时,的(de)感化是(shi)使(shi)胞内流线有(you)向边(bian)境(jing)标的(de)目的(de)切近的(de)趋向,这对活动(dong)(dong)(dong)的(de)不(bu)变有(you),以是(shi)温(wen)(wen)度(du)脉(mai)动(dong)(dong)(dong)减小当(dang)离(li)(li)心计心情反转时,的(de)感化是(shi)把涡往中间挤压,这会(hui)(hui)致使(shi)涡利,使(shi)得活动(dong)(dong)(dong)更(geng)不(bu)不(bu)变,温(wen)(wen)度(du)脉(mai)动(dong)(dong)(dong)就会(hui)(hui)增大在晶体(ti)发展进(jin)程中,晶体(ti)中杂质浓(nong)度(du),与熔(rong)体(ti)中杂质浓(nong)度(du)的(de)干系是(shi),有(you)用,有(you)用是(shi)有(you)用分凝系数(shu)有(you)用图舟(zhou)内熔(rong)体(ti)活动(dong)(dong)(dong)状(zhuang)况(kuang)为(wei),数(shu)较(jiao)(jiao)小时,为(wei)数(shu)较(jiao)(jiao)大时。

  均(jun)衡分凝系数,是(shi)常数,是(shi)晶(jing)(jing)(jing)(jing)(jing)体(ti)(ti)(ti)发(fa)(fa)展(zhan)速率(lv),是(shi)杂质(zhi)(zhi)在(zai)熔(rong)(rong)体(ti)(ti)(ti)中(zhong)(zhong)的(de)(de)(de)(de)(de)分散系数,占是(shi)边境层厚度(du)(du)发(fa)(fa)展(zhan)界面四周(zhou)熔(rong)(rong)体(ti)(ti)(ti)中(zhong)(zhong)的(de)(de)(de)(de)(de)温度(du)(du)变更间接影响(xiang)晶(jing)(jing)(jing)(jing)(jing)体(ti)(ti)(ti)发(fa)(fa)展(zhan)速率(lv),即(ji)(ji)影响(xiang)蛛效的(de)(de)(de)(de)(de)值(zhi),也就(jiu)影响(xiang)了晶(jing)(jing)(jing)(jing)(jing)体(ti)(ti)(ti)中(zhong)(zhong)的(de)(de)(de)(de)(de)杂质(zhi)(zhi)浓(nong)度(du)(du),明显,猛(meng)烈的(de)(de)(de)(de)(de)温度(du)(du)脉动会(hui)致使晶(jing)(jing)(jing)(jing)(jing)体(ti)(ti)(ti)中(zhong)(zhong)杂质(zhi)(zhi)散布(bu)不平(ping)均(jun),呈现(xian)杂质(zhi)(zhi)条纹以是(shi),离心(xin)计心(xin)情(qing)正转时(shi)发(fa)(fa)展(zhan)晶(jing)(jing)(jing)(jing)(jing)体(ti)(ti)(ti),对晶(jing)(jing)(jing)(jing)(jing)体(ti)(ti)(ti)品质(zhi)(zhi)会(hui)有改良反之(zhi),离心(xin)计心(xin)情(qing)反转时(shi),对晶(jing)(jing)(jing)(jing)(jing)体(ti)(ti)(ti)发(fa)(fa)展(zhan)倒(dao)霉论断本尝试成果为咱们供给了一个提醒(xing)在(zai)离心(xin)计心(xin)情(qing)情(qing)况中(zhong)(zhong)停止晶(jing)(jing)(jing)(jing)(jing)体(ti)(ti)(ti)发(fa)(fa)展(zhan),除遭(zao)到超重的(de)(de)(de)(de)(de)影响(xiang)外,还遭(zao)到力(li)的(de)(de)(de)(de)(de)影响(xiang)当离心(xin)计心(xin)情(qing)上停止程度(du)(du)定向凝结发(fa)(fa)展(zhan)单晶(jing)(jing)(jing)(jing)(jing)时(shi),若(ruo)离心(xin)计心(xin)情(qing)的(de)(de)(de)(de)(de)动弹标的(de)(de)(de)(de)(de)目的(de)(de)(de)(de)(de)与(yu)熔(rong)(rong)体(ti)(ti)(ti)内的(de)(de)(de)(de)(de)热对流标的(de)(de)(de)(de)(de)目的(de)(de)(de)(de)(de)不异时(shi),即(ji)(ji)熔(rong)(rong)体(ti)(ti)(ti)的(de)(de)(de)(de)(de)高温端顶(ding)风时(shi),熔(rong)(rong)体(ti)(ti)(ti)中(zhong)(zhong)温度(du)(du)脉动能够(gou)获(huo)得按捺,有益于发(fa)(fa)展(zhan)无杂质(zhi)(zhi)条纹的(de)(de)(de)(de)(de)单晶(jing)(jing)(jing)(jing)(jing)反之(zhi),若(ruo)离心(xin)计心(xin)情(qing)反向动弹时(shi),即(ji)(ji)熔(rong)(rong)体(ti)(ti)(ti)的(de)(de)(de)(de)(de)高温端顶(ding)风时(shi),熔(rong)(rong)体(ti)(ti)(ti)中(zhong)(zhong)存在(zai)较强的(de)(de)(de)(de)(de)温度(du)(du)脉动,倒(dao)霉于单晶(jing)(jing)(jing)(jing)(jing)的(de)(de)(de)(de)(de)平(ping)均(jun)发(fa)(fa)展(zhan)。

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