failure and carbons
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7/23/2019 Failure and Carbons
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Seal Failure Analysis
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Seal Failure Analysis
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Seal Failure Analysis
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Seal Failure Analysis
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Seal Failure Analysis
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Primary Seal
Materials
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Primary Seal Wet Seals
Primary Ring (Narrow - Softer) Materials Carbon-gra!ite
resin imregnate"
antimony imregnate"
Carbon #on$erte" to Sili#on Carbi"e
resin imregnate"
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Primary Seal Wet Seals
Primary Ring (Narrow - Softer) Materials Carbon-gra!ite
resin imregnate"
antimony imregnate"
Carbon #on$erte" to Sili#on Carbi"e
resin imregnate"
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Primary Seal Wet Seals
Carbon converted toCarbon converted to
Silicon CarbideSilicon Carbide
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Solid Silicon CarbideSolid Silicon Carbidepure sinteredpure sinteredreaction bondedreaction bonded
Tungsten CarbideTungsten Carbidenickel or cobaltnickel or cobalt
bondedbonded
Primary Seal Wet Seals
Primary Ring (Narrow - Softer) Materials Carbon-gra!ite
resin imregnate"
antimony imregnate"
Carbon #on$erte" to Sili#on Carbi"e
resin imregnate"
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Primary Seal Wet Seals
Mating Ring (Wi"e - %ar"er) Materials Cerami#
&&' aluminium o*i"e
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Mating Rings+ Cerami#
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Mating Rings+ Cerami#
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Primary Seal Wet Seals
Mating Ring (Wi"e - %ar"er) Materials Cerami#
&&' aluminium o*i"e
Sili#on Carbi"e
ure sintere" or rea#tion bon"e"
,ungsten Carbi"e
#obalt or ni#el bon"e"
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Primary Seal - .ry /as Seals
Mating Ring Materials (Rotating in ,ye 01) ,ungsten Carbi"e
Cobalt bon"e"
Ni#el bon"e" (2tional)
Sili#on Carbi"e
Pure sintere"
3i4ui" !ase sintere" - !ig! ressure (5P675P)
8.u#tile9 Mating Ring
,ungsten #arbi"e lating on stainless steel
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Mating Ring Material Sele#tion ,ungsten Carbi"e (Cobalt bon"e")
,oug!
%ig! strengt!
:est slow roll erforman#e
Cobalt bin"er #an be #!emi#ally atta#e"
Ni#el bon"e" is a$ailable - better resistan#e
Sili#on Carbi"e
%ig!ly #orrosion resistan#e
/oo" slow roll erforman#e
;ery brittle easily #!ie"
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Mating Rings
Chloride attack onChloride attack on
Tungsten CarbideTungsten Carbide
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Mating Ring Material Sele#tion
.u#tile Mating Ring Material
Ni6Cr tungsten #arbi"e on stainless steel
7'g'< =>? SS@ >6= P%@ .ule* SS
B"eal for outboar" seal ;irtually in"estru#tible will not s!atter
3ower #ost
3ow t!ermal #on"u#ti$ity
Ma*imum "ifferential ressure ? bar
%ig!er leaage "ue to "istortion
Minimum P of > bar re4uire" note 26:
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Materials Wet Seals
Material
JC
Code
Vickers
Hardness
Thermal
ConductivityW/mC@20C
Expansion
CoefcientX 10!/C
Thermal
Shock000"s W/m
Density
000"s kg/m#
Silicon Carbideure !lpha Sintered
2$$ 2%00 12% &'0 2& #'1
Silicon Carbide "#$%Si& 'eaction (onded
0((2%00
) so*ter Silicon1%0 &'! #% #'1
Converted SiliconCarbide)Carbon 121 2%00) so*ter carbon %0 &'0 #0 2'0
Tun*sten Carbide"+% Cobalt
02% 1%001!00 100 %'2 &( 1&'$
Tun*sten Carbide"+% ,ickel
00% 1#001%00 (0 %'! 1&'$
!luminium -xide
..&/% !lumina
0%+ 1%00) 2! !'+ ! #'+
!ustenitic Cast 0ron#1% ,i2 +% Cu
00$ 200 &0 1+'# $'#
Carbon34raphite'esin 0mpre*nated
1$1+0
,estimated-12 #'$ 10 1'(
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