·320· 北京科技大学学报 2005年第3期 Morphology of silicon in corundum silicon-nitride composites after nitridation TU Junbo,SUN Jialin",HONG Yanruo 1)Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China 2)College of Materials,Hebei Polytechnic University,Tangshan 063009,China ABSTRACT The morphology of silicon was studied in corundum silicon-nitride composites after nitridation at different temperatures.The results showed that silicon was wrapped by flocculant O'-Sialon at 1 300C.Silicon gra- ins were broken and silicon nitride formed inside the grains at 1 400C.All silcon was nitrided into O'-Sialon or sili- con nitride without any silicon left at 1 500C.Impurities from silicon such as Cao,Fe2O,were aggregated at 1600℃. KEY WORDS silicon;corundum-silicon nitride;nitridation;morphology (上接第23页) Fluidity of liquid phase in iron ores during sintering WU Shengli,DU Jiancin,MA Hongbin,TIAN Yunging,XU Haifa Metallurgical and Ecological Engineering School,University of Science and Technology Beijing.Beijing 100083,China ABSTRACT In the sintering process of iron ores,the fluidity of sintering liquid phase created by iron ores reacting with CaO is one of the important indexes that evaluate whether the sintering mixture can consolidate effectively. 10 kinds of imported iron ore fines were used to investigate the fluidity of liquid phase in iron ores and analyze its influential factors by the minitype sintering method and the viscosity evaluation method based on flow area.The ef- fect of the fluidity of liquid phase in iron ores on the realistic sintering process was discussed.The results indicate that different iron ores have different fluidities of liquid phase in sintering conditions due to their inherent charac- teristics. KEY WORDS iron ore;sintering;liquid phase;ore-blending一 3 20 - 北 京 科 技 大 学 学 报 20 5 年 第 3 期 M o rp h o l o g y o f s ili e on in e o mn d切 m s ili c o n 一 n iitr d e e o m P o s iet s a ft e r n iitr d iat on 了乙 了 J扮刀 b ol, )z, S UN涌沁 l iln 毛刀口刀 G aY n r ou , , l ) M at e r ial s S c i e n c e an d E n g in e e ir n g S e h o l , U n lv e 口 iyt o f s e i enc e an d eT c bn o 1 0罗 B e ij in g , B e ij ign l 0 0 0 8 3 , C h in a 2 ) C o ll e g e o f M a et ir als , H e be i P o lyt e e ho i c U O l v e sr iyt, 毛 m g s加也 0 6 3 0() 9 , C h ir 以 A B S T R A C T T h e nI o pr h o lo gy of isl ic on ~ s ot d ied in c o 几 nI 山口 is ll e o n . n iitr de c o m Po s iet s 吐e r 川itr d at ion at id 月免r e nt et m pe r a 奴rI e s . hT e er sul st s ho we d ht a t s il con was w n 甲Ped 妙 月加c ul ant o -,S i a】o n at 13 0 ℃ , is icl 叻 g r a - ins w e re b r o ke n an d s ili e on 苗itr de fo n n e d ins id e ht e gr 田n s at 1 4 0 0 oC . lA l s il e on w a s ul itr de d int o 0 ,一 i al on or s ili - c on in itr de w lth o ut an y isl ic on le ft at 1 5 0 ℃ . 加甲诵t i e s fr o m isl c on suc h as C aO , F` q , v e r e a 因歹e g at e d at 1 6 0 0℃ . K E Y W O RD S s ili e on ; e o rL m山 nU 一 s ili e on n iitr de ; n iitr d时ion ; m o pr h o l o gy (上接 第 2 9 3 页 ) F l u idiyt o f liqu i d P h as e i n ior n o er s d u ir gn s in et ir gn 邵U hS e喇1, D U iJ a xn in, 九区 oH妙 i,n 乃叼 N uY qn ign, X U aH扣 M e at l钊l gr l c ia an d玫 o l o gi c al E n g in e血 9 S c h o o ,l U n i v ser iyt o f s e l e n c e an d eT c bn o l o gy B e ij in g , B iej ign l 0 00 83 , C h i n a A B S T R A C T ih hte s in te 山19 P r o e e ss o f 甘 o n o re s , het fl u l d iyt o f s int e irn g 1i qul d Pha s e cer at ed by ir o n oer s er a e t in g iw ht C aO 1 5 oen o f het 加P o rt aJ 吐 i n d e x e s ht at ve a luat e 场七e ht e r het s int e irn g m i x ot er e an c o 幻` o lidat e e fe e it v e .ly 10 ik n ds of im P 0 rt e d i r o n oer 五n e s w er us ed ot ivn e s ti g aet het fl ul d iyt of h qul d hP aS e in ir o n oer s an d an a 1y z e ist in n ue int al fac ostr by het m in i ytP e s int e it n g m e t h o d an d het vi sc o s i yt ve a 地iat on m het od b as ed on ifo w aer a . Th e -ef fe ct of ht e fl u iid yt of il qul d 如as e in ir o n oer s on het er ial ist o s int 留in g P r o ce s w a s id sc us se d . T五e er s ul t s in d i c aet 小a t id fe r e n t ir on oer s h va e d ifl 七r e in fl u iid it es of h俩d P h as e in s in t e irn g 。曲d iit osn du e ot het ir 汕由e r e n t c h田甩 c - t e ir s it e s . K E Y W O RD S i orn oer ; s in et ir n g ; il q ul d 户as ;e oer 一 bl e n d i n g