95% oF YoUr FErroGraM anaLYSiS can BE DEi … · Trico panauuseu iUcoa a Ba uai uTcopaG Trico...
Transcript of 95% oF YoUr FErroGraM anaLYSiS can BE DEi … · Trico panauuseu iUcoa a Ba uai uTcopaG Trico...
TYPICAL FERROGRAPHIC WEAR PARTICLES
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Black particles aligned in magnetic field
causeHigh operating temperatures and/or insufficient lubrication Magnification 500x
Flat platelets < 15 microns in major dimension
causeNormal machine wear Magnification 500x
rUBBinG WEar
Flat elongated > 20 microns with striations
causeexcessive load/speed on sliding surface. this example is composed of copper alloy.Left: Magnification 500x Right: 3D photomicroscopy
SEVErE WEar
Flat striated particlesHeat treated
causeFatigue, scuffing or scoring of gear teethMagnification 500x
cHUnKS
Long, curved strips of metal Heat treated
causemisalignment or abrasive contamination in lubricantMagnification 500x
aBraSiVE WEar
Laminar platelets Heat treated
causerolling contact failureMagnification 500x
LaMinar WEar
Small spheres < 5 microns in diameter
causeearly warning of rolling element bearing failureMagnification 500x
SpHErES
DarK METaLLo oXiDES
red-orange particles aligned in magnetic field
causewater in the oil or poorlubricant conditionMagnification 500x
rED oXiDE
white metal particle misaligned with magnetic field
causealuminum component wearMagnification 500x
non FErroUS
Heavy concentration of fine particles at exit of ferrogram
causeoil additive conditionMagnification 100x
corroSiVE WEar
red-orange particles are red oxides and black particles are black oxides
causePoor lubrication conditionsMagnification 100x
rED & DarK METaLLo oXiDE
nonMETaLLic crYSTaLLinEHard abrasive debris that can initiate an abnormal wear condition
causeoutside contaminationMagnification 500x
Non-aligned and passes transmitted light
causePossible paper filter failure Magnification 200x
FiBErS
amorphous materials which pass transmitted light
causeexcessive load or stress on lubricant Magnification 500x
FricTion poLYMErS
Heat treated ferrogram (330°c/625°F) show both blue and gold temper colors indicating low alloy steel and medium alloy steel respectively
causeabnormal gear wearLeft: Magnification 400x Right: 3D photomicroscopy
LoW aLLoY & MEDiUM aLLoY STEEL parTicLES
an indication of welding, grinding, sandblasting, etc., near the equipment
causeoutside contaminationMagnification 500x
conTaMinanT SpHErES
Nonferrous - before and after heat treatment
causeBabbitt journal bearing wearMagnification 500x
LEaD/Tin BaBBiTT
Nonferrous particle, gray in color with many shear planes
causeSolid lubricant additives in systemMagnification 400x
MoLYBDEnUM DiSULFiDE
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Chart is in accordance with ASTM D 7690 standard. © 2011 Trico Corporation
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