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《Material Science and Technology》 2002-01
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Effect of the addition of TiB_ 2 on mechanical properties of i-B-C composites

LI Shi-bo,WEN Guang-wu,ZHANG Bao-sheng(School of Material Science and Engineering,Harbin Institute of Technology,Harbin150001,China)  
TiB 2 /TiC ceramic composites were fabricated by Hot-pressed B 4 C and Ti powders(mole ratio1:3)under1800℃,35MPa conditions.The flexural strength and fracture toughness of composites were454MPa and8.4MPa·m 1/2 ,re spectively.When5%and20vol%TiB 2 are added,the rod-like particles appeared in composites.These particles are TiB 2 as confirmed by XRD.The flexural strength and fracture toughness of composites with5%TiB 2 particles were increased to540MPa and10.8MPa·m 1/2 ,respectively;but dropped to357MPa and8.19MPa·m 1/2 with20%TiB 2 .The microstructure of composites by the addition of TiB 2 was observed by means of SEM.The results show that the amount of rod-like particles TiB 2 with a length of10~40μm when5%TiB 2 is added is larger than that of20%TiB 2 composites and smaller amount of pores were observed when20%TiB 2 is added,lots of pores and some agglomerated TiB 2 grains were observed.These factors limited the rodlike TiB 2 growth and impaired the mechanical properties of composites.It is clear that in-situ formation of rod-like particles enhanced the composite properties with a definite content of TiB 2 ad-dition.
【CateGory Index】: TQ174
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