影响粉末电阻率测定结果的因素_朱洁

,,(,132002):,,,:;;:TQ127.1+1:A:100123741(2002)0320045203ONFACTORSINFLUENCINGTHETESTRESULTSOFELECTRICALRESISTIVITYOFPOWDEREDCARBONSZHUJie,HEJing2yuan,WANGJing(JilinCarbonGroupCoLtd,JilinJilin132002,China)Abstract:TestmethodsavailablenowinChinaformeasuringtheelectricalresistivityofpowderedcarbonmaterialsarecomparedandevaluatedundervarioustestconditionswithanaimofestablishingarelationshipbetweentheelectricalresistivityofcarbonsamplesandthetestconditions.Ithasbeenfoundthatthemeasuredelectricalresistivityvalueofpowderedcarbonsisrelatedtothesampleloadingmethodandtheheightofsampleloadedaswellasthemethodsadoptedformeasuringvoltage2drop.Keywords:Powder;electricalresistivity;test,,,,,,,3:(1)YB/T035-92();(2)Q/JT1X-53-11-88();(3)FZ-9601()3,:,,:37,1988,:2002-01-2220023CARBONTECHNIQUES20023120SUM1201Table1Theeffectsofloadingsamplemethodsontestingresults()/(m)()/(m)15004622450418348345045004655470437646543474604308475440948044610502464,,1;,;,11,7%,,,23,(20.00.5)mm;15.017.0mm;17.019.0mm,223,,,,,,,,2Table2TheeffectsofsampleheightsontestingresultsH/mm/mH/mm/mH/mm/m19.550015.046517.041519.650415.247017.242219.750915.446617.442819.851515.646717.843719.951815.846418.044220.052016.047218.244820.152416.446818.445320.253016.646518.645720.353516.847118.846020.454017.047019.0465:H;1Fig.1Schematicdiagramofloadingsample,,,1,,3,2,,,,,,4820022Fig.2Instrumentfortestingpowderelectricalresistivity3Fig.3Determinationmethodwithtwoterminals4Fig.4Determinationmethodwithfourterminals,,,,,,50,25433Table3Theeffectsofdeterminationmethodsofvoltage2dropontestingresults/(m)/(m)14624102460410345841245505055452410645541575405008465420945041010463420R0,V=IR=I(R+R0)I,V,(=VS/(IH),;4,,,,4050m,(17.0-0.2)mm,35,,,:1),,;2),,;3),,,;4)349