Effects of Graphite Additives on Rheological Properties of Magnetorheological Grease

doi:10.12068/j.issn.1005-3026.2024.02.007

Abstract

Abstract:

To study the effect of graphite additive on the rheological properties of magnetorheological grease， graphite magnetorheological grease （GMRG） was prepared. The GMRGs with graphite powder mass fractions of 0%， 2%， 5%， 8% and 10% were prepared using grease as the matrix. The rheological properties of 5 groups of GMRG were measured in steady-state shear and oscillatory shear modes， and the effect of graphite additive mass fraction on yield stress and viscoelasticity was analyzed. The results showed that compared with the magnetorheological grease without graphite powder addition， the GMRG can achieve higher yield stress under the loading current of 3 A. The yield stress of the GMRG was increased by 40.49%， 54.12%， 81.48% and 147.48% with graphite mass fractions of 2%， 5%， 8% and 10%， respectively. In addition， with， the viscoelastic characteristics of the GMRG become more pronounced as the graphite mass fraction increase， but the relative magnetorheological effect achieved by the GMRG becomes smaller. The mass fraction of graphite does not affect the linear viscoelastic range of the GMRG was also found.

Key words: magnetorheological grease, graphite, oscillatory shear, rheology, yield stress

CLC Number:

TB 381

Ji-qiang DONG, Xu-dan YE, Run-song MAO, Jiong WANG. Effects of Graphite Additives on Rheological Properties of Magnetorheological Grease[J]. Journal of Northeastern University(Natural Science), 2024, 45(2): 201-208.

Figures/Tables 11

Table 1 Composition of various MRG samples （mass fraction）

试样	羰基铁粉	润滑脂	石墨粉末
MRG	70	30	0
GMRG-2	70	28	2
GMRG-5	70	25	5
GMRG-8	70	22	8
GMRG-10	70	20	10

Fig. 1 MCR302 parallel plate rheometer test principle

Fig. 2 Viscosity versus shear rate curves of MRG and GMRG under different loading currents

Fig. 3 Variation of shear stress with shear rate for MRG and GMRG under different loading currents

Table 2 The shear yield stress of MRG and GMRG at various loading currents

材料	加载电流/A	磁场强度/mT	屈服应力/Pa
MRG	0	0	33.595
	1	244	7 637.684
	2	491	15 559.783
	3	726	16 050.786
GMRG-2	0	0	46.443
	1	244	8 625.888
	2	491	19 986.305
	3	726	22 550.019
GMRG-5	0	0	172.789
	1	244	9 473.651
	2	491	22 018.794
	3	726	24 738.405
GMRG-8	0	0	178.179
	1	244	10 991.118
	2	491	28 207.162
	3	726	29 130.154
GMRG-10	0	0	604.490
	1	244	19 440.271
	2	491	37 951.369
	3	726	39 755.280

Fig. 4 Comparison of MRG and GMRG yield stress at loading current of 0 A and 3 A

Fig. 5 Variation of storage modulus with shear strain of MRG and GMRG under different currents

Fig. 6 Variation of loss modulus with shear strain of MRG and GMRG under different currents

Fig. 7 Schematic diagram of the microscopic mechanism of the effect of graphite additives on the rheological properties of magnetorheological greases

Fig. 8 Variation of the relative magnetorheological effects with different currents

Table 3 Comparison of relative magnetorheological effects of MRG and GMRG

材料	相对磁流变效应 $R e f f$
MRG	35 594.2
GMRG-2	10 922.9
GMRG-5	9 436.8
GMRG-8	3 349.7
GMRG-10	856.7

Table 3 Comparison of relative magnetorheological effects of MRG and GMRG

材料	相对磁流变效应 $R e f f$
MRG	35 594.2
GMRG-2	10 922.9
GMRG-5	9 436.8
GMRG-8	3 349.7
GMRG-10	856.7

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