Journal of the American Ceramic Society (1)

《Journal of the American Ceramic Society (1)》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、~3,'.ibiJAmCeramSoc73[8]2222-27(1990)EffectofNitrogenPressureandDiluentContentontheCombustionSynthesisofTitaniumNitrideMaryamEslamloo-Grami*andZuhairA.Munir*DivisionofMaterialsScienceandEngineering,UniversityofCalifornia,Davis,California95616Theeffectsofgaspressureand

2、diluentcontentonthepressuresisexpectedtoincreasetheconversion.Suchanex-combustionsynthesisoftitaniumnitridewasinvestigated.pectationhasbeensupportedbypreviousobservation^.'.^,^CombustionoftitaniumpowdersamplescontainingTiNInarecentworkbythepresentauthors?itwasfoundtha

3、tasadiluentintheconcentrationrange0to60wt%wasthedegreeofconversiontothenitridedependedontheini-carriedoutinanitrogenatmosphereatpressuresinthetialporosityoftheTipowdercompactswithamaximumrange0.1to1.4MPa.Analysisofthedependenceofcombus-degreeofconversionoccurringatare

4、lativedensityoftionwavevelocityontemperaturegaveanactivationenergyapproximately58%.Lowerconversionforthelower-densityof342f50kJ-mol-',whichisingoodagreementwith(<58%)sampleswasattributedtothemeltingphenomenonreportedvaluesforthediffusionofnitrogenintitaniumdiscussedab

5、ove,andlowerconversionforthehigher-densitynitride.[Keywords:titaniumnitride,combustionsyn-(>58%)sampleswasattributedtothelimitedinitialporosity.thesis,pressure.]Inthispaper,wereporttheresultsofaninvestigationofthecombustionsynthesisofTiNfromdilutedTispecimensandN2gasa

6、tpressuresintherangeof0.1to1.4MPa.I.IntroductionNTHEreactionbetweentitaniummetalpowderandnitro-I11.ExperimentalProceduregengas,theheatliberatedisadequatetosustainthereac-tionintheformofacombustionwaveevenatarelativelylowTitaniumandtitaniumnitridepowders(-325mesh)withn

7、itrogenpressure(1atm(=lo5Pa)).Theintensityofthisreac-anaverageparticlesizeof10Fmweresuppliedtas99%pure.tionisreflectedbyaveryhighcombustiontemperatureforForsampleswhichcontainedadiluent,thepowdersweretheformationofTIN,4900K.'Althoughthistemperatureismixedinarollermixe

8、randpressedintocylindricalshapeinaoftheoreticalsignificanceonly,itsuggeststhatunderexperi-hydraulicpressatpressuresofabout30