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Chinese Journal of Materials Research  2014, Vol. 28 Issue (12): 955-960    DOI: 10.11901/1005.3093.2014.361
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Influence of Fe Content and Particle Size of Carbonyl Iron Powder on Shear Yield Stress of Magnetorheological Fluids
Jun YAO1,*(),Jinqiu ZHANG1,Zhizhao PENG1,Guanglei ZHANG2
1. Brigade of Armament Trial and Training, Academy of Armored Force Engineering, Beijing 100072
2. Political Headquarters, Academy of Armored Force Engineering, Beijing 100072
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Jun YAO,Jinqiu ZHANG,Zhizhao PENG,Guanglei ZHANG. Influence of Fe Content and Particle Size of Carbonyl Iron Powder on Shear Yield Stress of Magnetorheological Fluids. Chinese Journal of Materials Research, 2014, 28(12): 955-960.

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Abstract  

The influence of Fe content and particle size of carbonyl iron powder on shear yield stress of magnetorheological fluids were investigated. The results show that the max shear yield stress of magnetorheological fluids with different carrier oil increases with the increasing Fe content, as well as the increasing particle size respectively. A formula is deduced to assess the weight factor related with the effect of Fe content and particle size on the performance of MRF, which was then optimal through experimental approach. It follows that the Fe content of carbonyl iron powder weighs higher than the particle size in terms of their contribution to the enhancement of shear yield stress. In the end, the possible errors have been analyzed, so that to prove the validity of experiments carried out above.
Key words:  metallic materials      magnetorheological fluids      Fe content      particle size      shear yield stress     
Received:  16 July 2014     
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Articles by authors
Jun YAO
Jinqiu ZHANG
Zhizhao PENG
Guanglei ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.361     OR     https://www.cjmr.org/EN/Y2014/V28/I12/955

Number Carbon iron Carrier oil Weight percentage of magnetism particles in MRF
1 98.34%Fe Silicone oil 201-50 70%
2 99.58%Fe Silicone oil 201-1000 75%
3 Special synthesis mineral oil 80%
Table 1  Experiment material and particle weight concentration
Number Carbon iron Carrier oil Weight percentage of magnetism particlees in MRF
1 2.50（99.58%） Silicone oil 201-50 70%
2 6.20（99.5%） Silicone oil 201-1000 75%
3 Special synthesis mineral oil 80%
Table 2  Experiment material and particle weight concentration
Fig.1  Shear yield stress of MRF which has different carrier oil and different particle concentration of Carbonyl Iron Powder (a) carrier oil is silicon oil H201-50 and the particle concentration of Carbonyl Iron Powder is 70%, (b) carrier oil is silicon oil H201-1000 and the particle concentration of Carbonyl Iron Powder is 75%, (c) carrier oil is special synthetic mineral oil and the particle concentration of Carbonyl Iron Powder is 80%, (d) carrier oil is silicon oil H201-50 and the particle concentration of Carbonyl Iron Powder is 70%, (e) carrier oil is silicon oil H201-1000 and the particle concentration of Carbonyl Iron Powder is 75%, (f) carrier oil is special synthetic mineral oil and the particle concentration of Carbonyl Iron Powder is 80%
Number (class 1) Shear yield stress( k P a ) Number (class 2) Shear yield stress( k P a ) Increasing rate (%)
1-MRF-111 36.26 1-MRF-211 37.26 2.76
1-MRF-112 38.68 1-MRF-212 42.56 10.03
1-MRF-113 48.34 1-MRF-213 53.18 10.01
1-MRF-121 43.51 1-MRF-221 46.89 7.82
1-MRF-122 49.86 1-MRF-222 53.18 6.54
1-MRF-123 55.60 1-MRF-223 58.01 4.33
1-MRF-131 39.68 1-MRF-231 41.09 3.52
1-MRF-132 42.51 1-MRF-232 47.12 10.84
1-MRF-133 50.76 1-MRF-233 57.56 13.40
Table 3  Max shear yield stress of MRF of which the particle size is the same while Ferrum content is different
Number(class 3) Shear yield stress( k P a ) Number(class 4) Shear yield stress( k P a ) Increasing rate(%)
2-MRF-111 37.26 2-MRF-211 42.97 15.32
2-MRF-112 42.56 2-MRF-212 50.13 17.79
2-MRF-113 53.18 2-MRF-213 57.30 7.75
2-MRF-121 46.89 2-MRF-221 62.07 32.37
2-MRF-122 53.18 2-MRF-222 66.85 25.71
2-MRF-123 58.01 2-MRF-223 71.62 23.46
2-MRF-131 41.09 2-MRF-231 47.45 15.48
2-MRF-132 47.12 2-MRF-232 56.88 20.71
2-MRF-133 57.56 2-MRF-233 65.68 14.11
Table 4  Max shear yield stress of MRF of which the magnetic particle size is different
Fig.2  Validation of shear yield stress of MRF which has different carrier oil and different particle concentration of Carbonyl Iron Powder (a) carrier oil is special synthetic mineral oil and the particle concentration of Carbonyl Iron Powder is 70%, (b) carrier oil is special synthetic mineral oil and the particle concentration of Carbonyl Iron Powder is 75%
Number Max shear yield stress τ y /kPa Particle size p /μm Saturation magnetization M s /(emu/g)
2-MRF-131 41.09 2.50 262.67
3-MRF-1 48.13 5.70 249.07
2-MRF-132 49.66 2.50 262.67
3-MRF-2 57.30 5.70 249.07
Table 5  Basic characteristics of MRF samples
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