GB1580687A - Process for the manufacture of sintered valve seat inserts - Google Patents
Process for the manufacture of sintered valve seat inserts Download PDFInfo
- Publication number
- GB1580687A GB1580687A GB3404379A GB3404379A GB1580687A GB 1580687 A GB1580687 A GB 1580687A GB 3404379 A GB3404379 A GB 3404379A GB 3404379 A GB3404379 A GB 3404379A GB 1580687 A GB1580687 A GB 1580687A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sintered
- piston rings
- copper
- compact
- skeleton
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 19
- 229910052802 copper Inorganic materials 0.000 claims description 19
- 239000010949 copper Substances 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 239000011733 molybdenum Substances 0.000 claims description 6
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 239000005864 Sulphur Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 229910001060 Gray iron Inorganic materials 0.000 claims description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 3
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000031070 response to heat Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/005—Particular materials for seats or closure elements
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0242—Making ferrous alloys by powder metallurgy using the impregnating technique
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Description
(54) A PROCESS FOR THE MANUFACTURE OF SINTERED
VALVE SEAT INSERTS
(71) We, BRICO ENGINEERING LIMITED, a British Company of Holbrook Lane,
Coventry, CV6 4BG, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to a process for the manufacture of valve seat inserts of sintered metal. The present application is divided out of British Patent Application No. 13/76, Serial
No. 1580686.
According to the present invention, a process for the manufacture of valve seat inserts of sintered metal includes the steps of selecting powders to give a sintered skeleton having substantially the following composition in percentages by weight:- combined carbon 1.2% copper 5%; molybdenum 0.5%; manganese, silicon, sulphur and phosphorus 0.3%; balance iron; compacting the powders together to form a compact; sintering the compact at a temperature of at least 1050"C in a protective atmosphere such as to avoid loss of carbon or oxidation of the compact to form the skeleton; and filling or partially filling the pores of the sintered skeleton with copper or with a copper alloy to give a copper content up to a maximum of 25% (including the copper content both of the sintered skeleton and of the infiltrant).
This filling may be effected by separately compacting a copper or copper alloy powder to form a compact which is then passed through the sintering furnace in contact with the ferrous compact, which optionally may have been previously sintered; alternatively the infiltration and sintering may take place simultaneously. In these cases the sintering temperature must exceed the melting point of the copper (1083"C) or of the copper alloy.
This technique is called infiltration and is well known to those in the field of powder metallurgy. The copper content of the resulting article may then be up to 25% by weight of the article.
The sintered article resulting from the above process may be subsequently machined to the desired dimensions. Other secondary treatments. including heat-treatment, surface coating or secondary pressing, may be applied to the article. The presence of molybdenum within the limits stated confers enhanced response to heat-treatment by quenching, and added resistance at service temperatures which would otherwise cause tempering and loss of hardness.
A number of specific examples will now be described.
Metal powders essentially of less than 150 microns in size were selected as examples 1-9.
These powders plus a suitable lubricant, were pressed in a suitable powder metallurgy press with the pressure given in the example to form different articles as described below, the pressing resulting in compacts having the values of density given in Tables 1A and 1B. The compacts were then sintered at the temperature given in a protective atmosphere such as to avoid loss of carbon, or oxidation of the compact. Example 1 was sintered in an atmosphere of endothermic gas having a dew point of -10 C e.g. partially combusted hydrocarbon air mixture (the hydrocarbon may be propane).
Example 2 was sintered in an atmosphere of similar endothermic gas but having a dew point of -15 C.
Example 3 was sintered in a similar atmosphere but having a dew point of -18 C.
It will be understood that the atmosphere must have a high carbon potential so that the atmosphere is in equilibrium with the carbon content of the compact, so that the latter does not decarburize considerably during sintering; for example, using the same endothermic gas but with a dew point of 0 C would give a carbon potential which was too low, resulting in decarburization of the compact.
Instead of endothermic gas, other atmospheres may be used, e.g. cracked ammonia, having a dew point of -35 C or dry hydrogen, having a dew point of -60 C, (these should be so chosen as to give no significant decarburization of the compact).
The composition of each example is given in Tables 1A and 1B.
TABLE 1A
Example 1 2 3 4 5*
Combined carbon 0.7 1.0 1.2 1.5 1.2
Copper 4.0 3.0 5.0 6.0 18* Molybdenum 0.6 0.7 0.5 1.1 0.43
Manganese, )
Silicon, Sulphur ) 1.0 2.0 0.3 0.5 0.26 & Phosphorus )
Iron 93.7 93.3 93.0 90.9 80.1 tons/sq. in. 30 35 40 40 40 density gm/cc 6.6 6.7 6.7 6.9 7.5 sintering Temp."C 1110 1085 1100 1110 1105 * Example 5 was obtained by copper infiltration of example 3.
13% Copper was aided by infiltration.
TABLE 1B
Example 6 7 8 9
Combined carbon 0.5 0.9 0.9 2.0
Copper 0 6.0 10.0 5.0
Molybdenum 0.2 0.8 0.6 3.0
Manganese. )
Silicon, Sulphur ) 0.1 2.0 1.0 0 & Phosphorus )
Iron 99.2 90.3 93.5 92.3 tons/sq. in. 35 30 35 35 density gm/cc 6.7 6.6 6.6 6.7 sintering Temp. C 1090 1110 1090 1090
Example 1 was pressed to form a sealing ring. The sintered blank was machined to give the finished dimensions. The sealing ring was tested and had a Vickers hardness HV5 of 150, a ring tensile strength of 525MN/m-. and an Elasticity number of 118 GN/m-.
Example 2 was pressed to form a automotive piston ring and machined after sinterint.
The piston ring had a Vickers hardness HV5 of 180, a ring tensile strength of 433 MN/m-, and an Elasticity Number of 125 GN/m2.
Examples 3. 4 and 5 were pressed to form valve seat inserts. After sintering. sharp edges were removed by barrelling and the outside diameter was machined. Example 3 had an average Vickers hardness HVS of 20(). and a O.1C/e proof stress in compression of 540
MN/m2. Example 4 had a Vickers hardness HVs of 25() and a O.1C/c proof stress in compression of 570 MN/m2. Example 5 had a Vickers hardness HV5 of 310 and a 0.1% proof stress in compression of 56() MN/m2. Examples 6. 7. 8 and 9 had physical characteristics similar to those of Examples 1, 2, 3 and 4 respectively.
Comparatives wear tests were also carried out between example 2 on the one hand, and typical grey cast iron piston ring material on the other. Piston rings made of the respective materials were bench tested for 500 hours in a number of 950 cc 4 cylinder engines.
The average diametral wear of the piston rings in the engines having the material of the composition of example 2 was 0.00052 inches, whereas the average wear of the piston rings in the engines having grey cast iron piston rings was 0.00195 inches at the end of the test.
Thus it will be seen that the sintered piston rings had only about one quarter of the wear of the cast iron piston rings under the same conditions.
WHAT WE CLAIM IS: l. A process for the manufacture of valve seat inserts of sintered metal including the steps of selecting powders to give a sintered skeleton having substantially the following composition in percentages by weight:combined carbon 1.2%; copper 5%; molybdenum 0.5%; manganese, silicon, sulphur and phosphorus 0.3%; balance iron; compacting the powders together to form a compact, sintering the compact at a temperature of at least 1050"C in a protective atmosphere such as to avoid loss of carbon or oxidation of the compact to form the skeleton; and filling or partially filling the pores of the sintered skeleton with copper or with a copper alloy to give a copper content up to a maximum of 25% (including the copper content both of the sintered skeleton and of the infiltrant.
2. A process as claimed in claim 1 and substantially as hereinbefore described with reference to Example 5.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (2)
- **WARNING** start of CLMS field may overlap end of DESC **.characteristics similar to those of Examples 1, 2, 3 and 4 respectively.Comparatives wear tests were also carried out between example 2 on the one hand, and typical grey cast iron piston ring material on the other. Piston rings made of the respective materials were bench tested for 500 hours in a number of 950 cc 4 cylinder engines.The average diametral wear of the piston rings in the engines having the material of the composition of example 2 was 0.00052 inches, whereas the average wear of the piston rings in the engines having grey cast iron piston rings was 0.00195 inches at the end of the test.Thus it will be seen that the sintered piston rings had only about one quarter of the wear of the cast iron piston rings under the same conditions.WHAT WE CLAIM IS: l. A process for the manufacture of valve seat inserts of sintered metal including the steps of selecting powders to give a sintered skeleton having substantially the following composition in percentages by weight:combined carbon 1.2%; copper 5%; molybdenum 0.5%; manganese, silicon, sulphur and phosphorus 0.3%; balance iron; compacting the powders together to form a compact, sintering the compact at a temperature of at least 1050"C in a protective atmosphere such as to avoid loss of carbon or oxidation of the compact to form the skeleton; and filling or partially filling the pores of the sintered skeleton with copper or with a copper alloy to give a copper content up to a maximum of 25% (including the copper content both of the sintered skeleton and of the infiltrant.
- 2. A process as claimed in claim 1 and substantially as hereinbefore described with reference to Example 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3404379A GB1580687A (en) | 1976-01-02 | 1976-01-02 | Process for the manufacture of sintered valve seat inserts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3404379A GB1580687A (en) | 1976-01-02 | 1976-01-02 | Process for the manufacture of sintered valve seat inserts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1580687A true GB1580687A (en) | 1980-12-03 |
Family
ID=10360659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3404379A Expired GB1580687A (en) | 1976-01-02 | 1976-01-02 | Process for the manufacture of sintered valve seat inserts |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1580687A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4505988A (en) * | 1982-07-28 | 1985-03-19 | Honda Piston Ring Co., Ltd. | Sintered alloy for valve seat |
| GB2189812A (en) * | 1986-04-11 | 1987-11-04 | Nippon Piston Ring Co Ltd | Assembled cam shaft |
-
1976
- 1976-01-02 GB GB3404379A patent/GB1580687A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4505988A (en) * | 1982-07-28 | 1985-03-19 | Honda Piston Ring Co., Ltd. | Sintered alloy for valve seat |
| GB2189812A (en) * | 1986-04-11 | 1987-11-04 | Nippon Piston Ring Co Ltd | Assembled cam shaft |
| GB2189812B (en) * | 1986-04-11 | 1989-12-28 | Nippon Piston Ring Co Ltd | Assembled cam shaft |
| US5007956A (en) * | 1986-04-11 | 1991-04-16 | Nippon Piston Ring Co., Ltd. | Assembled cam shaft |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5080712A (en) | Optimized double press-double sinter powder metallurgy method | |
| US3864809A (en) | Process of producing by powder metallurgy techniques a ferritic hot forging of low flow stress | |
| US4913739A (en) | Method for powder metallurgical production of structural parts of great strength and hardness from Si-Mn or Si-Mn-C alloyed steels | |
| JPS5856022B2 (en) | High wear-resistant powder metallurgy tool steel article with high vanadium carbide content | |
| AU2005252150A1 (en) | Sintered metal parts and method for the manufacturing thereof | |
| JP3378012B2 (en) | Manufacturing method of sintered product | |
| US3889350A (en) | Method of producing a forged article from prealloyed water-atomized ferrous alloy powder | |
| KR20000057241A (en) | Iron-based powder | |
| US4174967A (en) | Titanium carbide tool steel composition for hot-work application | |
| US3471343A (en) | Process for the production of sinter iron materials | |
| US4128420A (en) | High-strength iron-molybdenum-nickel-phosphorus containing sintered alloy | |
| GB1598816A (en) | Powder metallurgy process and product | |
| GB1580686A (en) | Sintered piston rings sealing rings and processes for their manufacture | |
| JPS63500313A (en) | Impact-resistant powder metal parts and manufacturing method thereof | |
| GB1580689A (en) | Valve seat inserts of sintered metal | |
| US4049429A (en) | Ferritic alloys of low flow stress for P/M forgings | |
| US3591365A (en) | Heat resisting corrosion resisting iron chromium alloy | |
| GB1580687A (en) | Process for the manufacture of sintered valve seat inserts | |
| GB1580688A (en) | Valve seat inserts of sintered metal | |
| US4018632A (en) | Machinable powder metal parts | |
| US4173471A (en) | Age-hardenable titanium carbide tool steel | |
| EP0200691A1 (en) | Iron-based powder mixture for a sintered alloy | |
| JPS6345306A (en) | Production of sintered member | |
| US2882190A (en) | Method of forming a sintered powdered metal piston ring | |
| Semel | Ancorloy premixes: Binder-treated analogs of the diffusion alloyed steels |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19970331 |