CN109732081A - A method of improving powder metallurgy valve seat insert performance - Google Patents
A method of improving powder metallurgy valve seat insert performance Download PDFInfo
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- CN109732081A CN109732081A CN201910165413.8A CN201910165413A CN109732081A CN 109732081 A CN109732081 A CN 109732081A CN 201910165413 A CN201910165413 A CN 201910165413A CN 109732081 A CN109732081 A CN 109732081A
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- powder
- valve seat
- seat insert
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Abstract
The invention discloses a kind of methods for improving powder metallurgy valve seat insert performance, chemical component and its mass percent are as follows: C powder: 0.6~1.3%, Cr powder: 1~5%, Mo powder: 4~15%, Co powder: 0.2~2%, Ni powder: 0.5~2%, Nb powder: 0.2~2%, surplus is Fe powder.Valve seating of the invention is incorporated the high alloyed powder such as a certain amount of chromium, molybdenum, cobalt, nickel, niobium later, passes through mechanical mixture, compacting, sintering in the preparation first by base iron using basis powder made of water atomization.The physical properties such as valve seating calorific intensity and wearability and mechanical performance are made to be significantly improved.The job requirement of high-performance enginer can be met.
Description
Technical field
The invention belongs to metallurgical technology fields, will give alloying powder and are suppressed, are sintered and machined, and automobile zero is made
The field of metallurgy of component, specifically a kind of method for improving powder metallurgy valve seat insert performance.
Background technique
Valve seating is the important component in engine valve actuating mechanism, and the important sealing friction that partners of it and valve is paid, and is sent out
When motivation works, valve seating is impacted by valve, and the washing away of high temperature (530~870 DEG C) burning gases, burn into and burning produce
The abrasion of object, dust in air, in addition also by hot cold stress alternating action, it is easily deformed, scaling loss, even disconnected
It splits, therefore not only requires Materials for Valve Seat wear-resisting, corrosion-resistant, resistant to high temperatures, also require certain radial crushing strength.
Engine valve and valve seating are in harsh heating power, work under chemistry and mechanical force situation, subject height and answer
Power (engine maximum combustion pressure is up to 20MPa), elevated operating temperature (valve disc to planar central is up to 870 DEG C) and corrosive environment
(high-temperature fuel gas corrodes, vulcanizes) corrosion and oxidation.
According to the working environment of above-mentioned valve seating, to guarantee its functional reliability and service life, in different building rings
Border and in the case where using different fuel, it is necessary to developmental research new material and new process as early as possible.
Summary of the invention
The purpose of the present invention is in view of the above shortcomings of the prior art, provide a kind of raising powder metallurgy valve seat insert performance
Method, product of the present invention compression strength is high, has wear-resisting, corrosion-resistant, resistant to high temperatures and shock resistance, can meet high-performance and start
The working condition requirement of machine.
The present invention is achieved by the following technical solutions:
A method of improve powder metallurgy valve seat insert performance, which is characterized in that the chemical component of the valve seat insert and
Its mass percent are as follows: C powder: 0.6~1.3%, Cr powder: 1~5%, Mo powder: 4~15%, Co powder: 0.2~2%, Ni powder: 0.5
~2%, Nb powder: 0.2~2%, surplus is Fe powder；Raw embryo is placed in push-down after mechanical mixture, compacting by above-mentioned powder
Sintering furnace sintering, then by freezing processing, be sintered after tempering, it is substantially equally distributed that powerful alloy is obtained after sintering
Hard phase, to improve the wear-resisting property of valve seat insert.
Preferably, the chemical component and its mass percent of the valve seat insert are as follows: C powder: 0.8~1.2%, Cr powder: 2.5~
4.8%, Mo powder: 4.5~13%, Co powder: 0.8~1.9%, Ni powder: 0.6~1.9%, Nb powder: 0.3~1.8%, surplus Fe
Powder.
Preferably, the chemical component and its mass percent of the valve seat insert are as follows: C powder: 0.9%, Cr powder: 2.1%, Mo
Powder: 8.4%, Co powder: 0.5, Ni powder: 0.8%, Nb powder: 0.8%, surplus is Fe powder.
Preferably, the chemical component and its mass percent of the valve seat insert are as follows: C powder: 1.1%, Cr powder: 3.5%, Mo
Powder: 12.3%, Co powder: 1.3, Ni powder: 1.3%, Nb powder: 1.5%, surplus is Fe powder.
Preferably, the chemical component and its mass percent of the valve seat insert are as follows: C powder: 1.2%, Cr powder: 4.8%, Mo
Powder: 14.9%, Co powder: 1.6, Ni powder: 1.8%, Nb powder: 1.9%, surplus is Fe powder.
Valve seat insert in the present invention is sintered, and valve seating sintered blank hardness is HRC40~50, metallographic structure are as follows: horse
Family name's body+bainite+A is residual+hard phase, density >=7.5g/cm3.It can get after sintering equally distributed on powerful alloy substrate
Hard phase greatly improves product heat resistance, wearability, corrosion resistance and radial crushing strength.
Compared with existing powder metallurgy valve seat technology, the present invention have the utility model has the advantages that
The first, the present invention by improve hydraulic atomized powder-making technique and rationally add the chromium of certain content, molybdenum, cobalt,
The high alloy powder such as nickel, niobium makes the physical properties such as valve seating calorific intensity and wearability and machine by mechanical mixture, compacting, sintering
Tool performance is significantly improved.
Second: valve seating forms the institutional framework that Hard Inclusion is inlayed on relatively soft matrix through being sintered, hence it is evident that mentions
The high wearability of valve seating.Towards bavin 4102AZL powder metallurgy valve seat through east wind southern exposure diesel engine limited liability company property
It can test and reliability test is approved, properties of product satisfy the use demand, and can satisfy the working condition requirement of high-performance enginer.
Third: what valve seating of the invention was selected is chromium, molybdenum, cobalt, nickel, niobium alloy material, not only has higher conquassation strong
Degree and fatigue strength, and reliable in quality are suitble to the needs of high-performance enginer.
Specific embodiment
A method of improving powder metallurgy valve seat insert performance, the chemical component and its mass percent of the valve seat insert
Are as follows: C powder: 0.6~1.3%, Cr powder: 1~5%, Mo powder: 4~15%, Co powder: 0.2~2%, Ni powder: 0.5~2%, Nb powder:
0.2~2%, surplus is Fe powder.
In the preparation first by base iron using basis powder made of water atomization, be incorporated later a certain amount of chromium, molybdenum,
Cobalt, nickel, niobium alloy powder and 0.6~1.3% C powder.By raw embryo merging push-down sintering after mechanical mixture, compacting in 30 minutes
Furnace sintering, in ammonia dissolving atmosphere, 1100~1150 DEG C of temperature are sintered, valve seating sintered blank hardness HRC >=35, then are led to
- 150 DEG C of freezing processings are crossed, sintered material hardness is HRC40~50, density 7.5g/cm after 200 DEG C of tempering3Metallographic structure is horse
Family name's body+bainite+A is residual+hard phase, the substantially equally distributed hard phase of powerful alloy is obtained after sintering, is greatly improved
The wear-resisting property of valve seating.The preferred zinc stearate of lubricant.
The technical solution in implementing to the present invention is described below, described example is only present invention a part
Implement, instead of all the embodiments.
Here is three specific embodiment valve seating chemical components and its content (Wt%).
It is as shown in table 1:
It is as shown in table 2:
According to hypervelocity endurance test specification, will be carried out on test-bed towards bavin 4102ZAL powder metallurgy valve seat product
The test of full speed full load adds up operation 500 hours and (wherein merges 20 minutes 22 hours, external characteristics test 40 minutes 1 hour, by force
Change test 476 hours).Torn open machine testing, valve seating size all in the margin of tolerance, has no abrasion, and valve does not sink, and makes
With all right.
Claims (5)
1. it is a kind of improve powder metallurgy valve seat insert performance method, which is characterized in that the chemical component of the valve seat insert and its
Mass percent are as follows: C powder: 0.6~1.3%, Cr powder: 1~5%, Mo powder: 4~15%, Co powder: 0.2~2%, Ni powder: 0.5~2%,
Nb powder: 0.2~2%, surplus is Fe powder；Above-mentioned powder is burnt raw embryo merging push-down sintering furnace after mechanical mixture, compacting
Knot, then by freezing processing, be sintered after tempering, the substantially equally distributed hard phase of powerful alloy is obtained after sintering,
To improve the wear-resisting property of valve seat insert.
2. a kind of method for improving powder metallurgy valve seat insert performance according to claim 1, which is characterized in that the valve
The chemical component and its mass percent of valve seat are as follows: C powder: 0.8~1.2%, Cr powder: 2.5~4.8%, Mo powder: 4.5~13%, Co
Powder: 0.8~1.9%, Ni powder: 0.6~1.9%, Nb powder: 0.3~1.8%, surplus is Fe powder.
3. a kind of method for improving powder metallurgy valve seat insert performance according to claim 1, which is characterized in that the gas
The chemical component and its mass percent of gate valve seat are as follows: C powder: 0.9%, Cr powder: 2.1%, Mo powder: 8.4%, Co powder: 0.5, Ni powder:
0.8%, Nb powder: 0.8%, surplus is Fe powder.
4. a kind of method for improving powder metallurgy valve seat insert performance according to claim 1, which is characterized in that the gas
The chemical component and its mass percent of gate valve seat are as follows: C powder: 1.1%, Cr powder: 3.5%, Mo powder: 12.3%, Co powder: 1.3, Ni powder:
1.3%, Nb powder: 1.5%, surplus is Fe powder.
5. a kind of method for improving powder metallurgy valve seat insert performance according to claim 1, which is characterized in that the gas
The chemical component and its mass percent of gate valve seat are as follows: C powder: 1.2%, Cr powder: 4.8%, Mo powder: 14.9%, Co powder: 1.6, Ni powder:
1.8%, Nb powder: 1.9%, surplus is Fe powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910165413.8A CN109732081A (en) | 2019-03-05 | 2019-03-05 | A method of improving powder metallurgy valve seat insert performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910165413.8A CN109732081A (en) | 2019-03-05 | 2019-03-05 | A method of improving powder metallurgy valve seat insert performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109732081A true CN109732081A (en) | 2019-05-10 |
Family
ID=66369400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910165413.8A Pending CN109732081A (en) | 2019-03-05 | 2019-03-05 | A method of improving powder metallurgy valve seat insert performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109732081A (en) |
-
2019
- 2019-03-05 CN CN201910165413.8A patent/CN109732081A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190510 |
|
| WD01 | Invention patent application deemed withdrawn after publication |