Iron-based powder mixtures were prepared by dry and wet mixing method. The friction properties during compaction were tested by measuring the internal and external friction coefficient. The test results showed that the wet mixing process could realise the homogeneity of lubricant and improve the processing properties of the powder mixtures. With 0.6 wt-% lubricants, wet mixing powder mixtures have a flow rate of 29.6 s/50 g, an apparent density of 3.18 g cm–3, a repose angle of 35.5°, and the friction coefficient during the compaction is 0.223. An equation to calculate the total (both internal and external) friction forces during the compaction process is proposed, and then the factors influencing the friction coefficient during compaction were quantitatively analysed.
DegnanCCShipwayPHKennedyAR.Comparison of the green strength of warm compacted Astaloy CrM and Distaloy AE Densmix powder compacts. Mater Sci Technol. 2004; 20(6):731–738. DOI:10.1179/026708304225017292.
2.
AzevedoJMCSerrenhoACAllwoodJM.Energy and material efficiency of steel powder metallurgy. Powder Technol. 2018; 328:329–336. DOI:10.1016/j.powtec.2018.01.009.
3.
ChoeHBLeeHSShinJH.Experimental study on the electrochemical anti-corrosion properties of steel structures applying the arc thermal metal spraying method. Materials. 2014; 7(12):7722–7736. DOI:10.3390/ma7127722.
4.
CristofoliniIMolinariAPederziniGFrom experimental data, the mechanics relationships describing the behaviour of four different low alloyed steel powders during uniaxial cold compaction. Powder Metall. 2017; 61(1):10–20. DOI:10.1080/00325899.2017.1361507.
5.
XuZHodgsonMACaoP.Effects of mechanical milling and sintering temperature on the densification, microstructure and tensile properties of the Fe-Mn-Si powder compacts. J Mater Sci Technol. 2016; 32(11):1161–1170. DOI:10.1016/j.jmst.2016.08.024.
6.
RenatoPFranciscoAF.A study of a new phenomenological compacting equation. Powder Technol. 2001; 114(1–3):255–261. DOI:10.1016/s0032-5910(00)00207-2.
7.
WardMBillingtonJC.Effect of zinc stearate on apparent density, mixing, and compaction/ejection of iron powder compacts. Powder Metall. 1979; 22(4):201–208. DOI:10.1179/pom.1979.22.4.201.
SecondiJ.Modelling powder compaction: from a pressure-density law to continuum mechanics. Powder Metall. 2002; 45(3):213–217. DOI:10.1179/003258902225006943.
10.
LewisCJTrainD.An investigation of die wall friction during the compaction of powders. J. Pharm Pharmacol. 2011; 17(1):1–9. DOI:10.1111/j.2042-7158.1965.tb07558.x.
11.
TurenneSGodèreCThomasY.Evaluation of friction conditions in powder compaction for admixed and die wall lubrication. Powder Metall. 1999; 42(3):263–268. DOI:10.1179/003258999665611.
12.
SinkaICCunninghamJCZavaliangosA.The effect of wall friction in the compaction of pharmaceutical tablets with curved faces: a validation study of the Drucker-Prager Cap model. Powder Technol. 2003; 133(1–3):33–43. DOI:10.1016/S0032-5910(03)00094-9.
13.
ParkHKimKT.Consolidation behavior of SiC powder under cold compaction. Mat Sci Eng A. 2001; 299(1–2):116–124. DOI:10.1016/s0921-5093(00)01419-2.
14.
WuCYCocksACF.Flow behaviour of powders during die filling. Powder Metall. 2013; 47(2):127–136. DOI:10.1179/003258904225015617.
15.
MichrafyAJDoddsAKadiriMS.Wall friction in the compaction of pharmaceutical powders: measurement and effect on the density distribution. Powder Technol. 2004; 148(1):53–55. DOI:10.1016/j.powtec.2004.09.021.
16.
TurenneSThomasY.Evaluating friction in powder compaction for admixed and die-wall lubrication. Powder Metall. 1999; 42(3):263–268. DOI:10.1179/003258999665611.
17.
MontesJMCuevasFGCintasJModelling of three powder compaction laws for cold die pressing. Int J Mater Res. 2012; 103(12):1444–1454. DOI:10.3139/146.110816.
18.
MosbahPBouvardDOuedraogoEExperimental techniques for analysis of die pressing and ejection of metal powder. Powder Metall. 1997; 40:269–277. DOI:10.1016/S0026-0657(99)80014-9. doi: 10.1179/pom.1997.40.4.269
19.
YasudaKTanakaSNaitoM.Stochastic analysis on ceramic granule collapse in powder compact during cold isostatic pressing. Adv Powder Technol. 2016; 27(3):940–947. DOI:10.1016/j.apt.2016.02.032.
20.
CameronIMGethinDTTweedJH.Friction measurement in powder die compaction by shear plate technique. Powder Metall. 2013; 45(4):345–353. DOI:10.1179/003258902225007069.
21.
ChenWCChengJGChengLImproving the homogeneity and properties of ferrous powder mixes by a novel powder mixing process. Powder Metall. 2019; 62(2):74–83. DOI:10.1080/00325899.2019.1582830.
22.
DemetrioVBBendoTBinderCDevelopment of the self-lubricating steels by compression of granulated powders. Mater Sci Forum. 2017; 899:299–304. DOI:10.4028/www.scientific.net/MSF.899.299.
23.
ReedJS.Principles of ceramic processing. 2nd ed. New York (NY): John Wiley & Sons, Inc; 1995.
24.
BlauPJ.The significance and use of the friction coefficient. Tribol. Int. 2001; 34(9):585–591. DOI:10.1016/s0301-679x(01)00050-0.
