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Chinese Journal of Materials Research  2014, Vol. 28 Issue (1): 44-50    DOI: 10.11901/1005.3093.2013.683
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Thermodynamics of Ferro-based Friction Material by in-situ Carbothermic Reduction Form Vanadium and Titanium Iron Concentrate
Weilin DENG1,Keqin FENG1,**(),Guangming ZHANG1,2,Ying LI1,Yu ZHANG1
1. School of Manufacture Sci. and Eng., Sichuan Univ., Chengdu 610065
2. Sichuan Eng. Technical College, Deyang 618000
Cite this article: 

Weilin DENG,Keqin FENG,Guangming ZHANG,Ying LI,Yu ZHANG. Thermodynamics of Ferro-based Friction Material by in-situ Carbothermic Reduction Form Vanadium and Titanium Iron Concentrate. Chinese Journal of Materials Research, 2014, 28(1): 44-50.

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Abstract  

Ferro-based friction material was fabricated by reaction sintering technology, using Fe and Ti elements containing in vanadium and titanium iron concentrate as main raw materials, adding other ingredient on the basic of composition of ferro-based friction material, synthesis and sintering were accomplished unanimously in vacuum resistance furnace. Thermodynamic of the reduction of vanadium and titanium iron concentrate was calculated and studied, and the mass change of the reduction was studied by TG–DSC. The results show that the reduction temperature of Fe and Ti oxides is above 979 K, in the reduction process of vanadium and titanium iron concentrate, Fe3O4 is reduced by carbon firstly, and then titanomagnetite and ilmenite are reduced into Fe and Ti oxides, and finally different valent titanium oxides are reduced into TiC.Good interface bonding and compact structure have been got in experimental research by making reasonable process route.

Key words:  vanadium and titanium iron concentrate      ferro-based friction material      in-situ      thermodynamics     
Received:  18 September 2013     
Fund: *Supported by Science and Technology Support Program of Sichuan Province No.2012GZX0089.

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2013.683     OR     https://www.cjmr.org/EN/Y2014/V28/I1/44

Component TFe TiO2 Al2O3 SiO2 MgO CaO V2O5 S P
Mass fraction /% 53.17 12.65 4.69 3.89 3.91 1.57 0.56 0.677 0.005
Table 1  Components of vanadium and titanium iron concentrate
Fig.1  XRD pattern of vanadium and titanium iron concentrate
Equation No. Δ G r 0 =f (T)/Jmol-1
Fe3O4+C=3FeO+CO (2) 196828-201.05T
Fe3O4+4C=3Fe+4CO (3) 650716-659.955T
FeO+C=Fe+CO (4) 151592-152.969T
Fe2TiO4 +C=Fe+FeTiO3+CO (5) 189664-144.892T
2FeTiO3 +C=Fe+FeTi2O5+CO (6) 222397-207.267T
3/5FeTi2O5 +C=3/5Fe+2/5Ti3O5+CO (7) 294903-307.832T
Table 2  Carbothermic reduction and thermodynamic data of Fe oxides
Fig.2  Relationship of Δ G r 0 and T in the carbothermic reduction of Fe oxides
Equation No. Δ G r 0 =f (T)/Jmol-1
FeTiO3+C=Fe+TiO2+CO (8) 265414-294.251T
FeTiO3+4/3C=Fe+1/3Ti3O5+4/3CO (9) 356559-360.161T
FeTiO3+3/2C=1/2Ti2O3+Fe+3/2CO (10) 396877-384.571T
FeTiO3+2C=TiO+Fe+2CO (11) 553091-469.119T
FeTiO3+3C=Ti+Fe+3CO (12) 966634-649.183T
FeTiO3+4C=Fe+TiC+3CO (13) 791198-636.523T
Table 3  Carbothermic reduction and thermodynamic data of FeTiO3
Fig.3  Relationship of Δ G r 0 and T in the carbothermic reduction of FeTiO3
Equation No. Δ G r 0 =f (T)/Jmol-1
TiO2+1/3C=1/3Ti3O5+1/3CO (14) 91219.4-65.91T
TiO2+1/2C=1/2Ti2O3+1/2CO (15) 131658-90.32T
TiO2+C=TiO+CO (16) 291311-174.868T
TiO2+2C=Ti+2CO (17) 721099-354.932T
TiO2+3C=TiC+2CO (18) 533176-342.272T
Ti3O5+1/2C=3/2Ti2O3+1/2CO (19) 120598-73.23T
Ti3O5+2C=3TiO+2CO (20) 601345-326.875T
Ti3O5+8C=3TiC+5CO (21) 1326022-829.085T
Ti2O3+C=2TiO+CO (22) 320875-169.097T
Table 4  Carbothermic reduction and thermodynamic data of Ti oxides
Fig.4  Relationship of Δ G r 0 and T in the carbothermic reduction of Ti oxides
Equation No. Δ G r 0 =f (T)/Jmol-1
CaO+C=Ca+CO (23) 524543-196.037T
MgO+C=Mg+CO (24) 491704-199.907T
Al2O3+3C=2Al+3CO (25) 1345398-586.372T
SiO2+2C=Si+2CO (26) 687474-352.845T
Table 5  Carbothermic reduction and thermodynamic data of other oxides
Fig.5  Fig.5 Relationship of Δ G r 0 and T in the carbothermic reduction of other oxides
Fig.6  DSC-TG curves of vanadium and titanium iron concentrate-C system
Fig.7  Phase analysis of sintered composites
Fig.8  The microstructure of sintered composites
Fig.9  SEM (a) and EDS (b) images of white area of sintered composites
Fig.10  SEM (a) and EDS (b) images of dark area of sintered composites
Fig.11  SEM image of sintered composites
Fig.12  SEM (a) and EDS (b) images of granular structure
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