CN109794611A - Wear-proof high hardness powder metallurgy valve seat and its manufacture craft - Google Patents
Wear-proof high hardness powder metallurgy valve seat and its manufacture craft Download PDFInfo
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- CN109794611A CN109794611A CN201811634458.7A CN201811634458A CN109794611A CN 109794611 A CN109794611 A CN 109794611A CN 201811634458 A CN201811634458 A CN 201811634458A CN 109794611 A CN109794611 A CN 109794611A
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Abstract
The invention belongs to metallurgical technology fields, specifically disclose a kind of wear-proof high hardness powder metallurgy valve seat, using multi-arc ion coating (AIP) equipment, in-furnace temperature is controlled less than 300 DEG C, using multi-arc ion coating multi-layer nano-film preparation process, the wearing layer that the Multicomponent multilayer nano film as made of being laminated between chromium nitride and TiN phase is formed is generated in seating face.Manufacture craft: basic powder uses the low-alloy powder of hydraulic atomized preparation, is pressed in automatic Powder molding machine, is placed in push-down sintering furnace later, is sintered in ammonia dissolving atmosphere.Coating treatment, product film multiple stratification and the other elements of addition are carried out using copper leaching technology, then by sintered blank merging multi-arc ion coating (AIP) equipment.Product produced by the present invention has excellent bond strength, surface microhardness, wear-resisting, high rigidity, and can significantly prolong the service life.
Description
Technical field
The invention belongs to metallurgical technology field, alloying powder will be given and suppressed, be sintered, is machined and multi sphere ion
The field of metallurgy of auto parts and components is made in plated film.
Background technique
Valve seating is the important component in automobile engine air distributing device, it and valve partner important sealing friction
It pays, when engine operation, valve seating is impacted by valve, the washing away of high temperature (530~870 DEG C) burning gases, burn into and combustion
The abrasion of product, dust in air is burnt, in addition also by hot cold stress alternating action, it is easily deformed, scaling loss, or 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 low degree center is up to 870 DEG C) and corrosive environment
(high-temperature fuel gas corrodes, vulcanizes, V2Q5) 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 object of the present invention is to provide wear-proof high hardness powder metallurgy valve seat and its manufacture craft, the present invention mentions significantly
The high surface microhardness of substrate, the consistency of film is high, and intensity and wear-resisting property are good, and can prolong the service life.
The first purpose of this invention is achieved through the following technical solutions, wear-proof high hardness powder metallurgy valve
Seat, using multi-arc ion coating (AIP) equipment, in-furnace temperature is limited to less than under 300 DEG C of operating condition, using " multi sphere ion
Plate multi-layer nano membrane preparation technology ", the multi-component multi-layer as made of being laminated between chromium nitride and TiN phase is generated in seating face
The wearing layer of (11-21 layers) of nanometer film formation.
Multi-arc ion coating applied by the present invention (AIP) equipment, is developed by Chinese Academy of Sciences's mechanics.The equipment can prepare single layer
Film (TiN, CrN), has 12 target position, and using computer control system (PLC+I control machine), revolving speed can balance adjustment workpiece
Rotation system and filtering cathode electric arc working method, to guarantee that coating is fine and closely woven, uniform, by " multi-arc ion coating multi-layer nano-film
Technology of preparing " is applied on valve seating, is physical gas phase deposition technology: current collection muon physics, material, vacuum control technology are in one
New and high technology.
Second object of the present invention is achieved through the following technical solutions, wear-proof high hardness powder metallurgy valve seat
Manufacture craft, comprising the following steps:
1. being selected first by hydraulic atomized low-alloy powder to be basic powder, pressed on automatic Powder molding machine
Type is made；
2. the valve seating green compact of compression moulding are placed in push-down sintering furnace, it is sintered, is sintered in ammonia dissolving atmosphere
1100-1500 DEG C of temperature, sintering time 50-60 minutes；Using copper leaching technology；The sintered blank includes following components: C
0.7-1.2wt%, Cr 0.3-1.2wt%, Mo 0.5-1.6wt%, Ni 0.4-1.5wt%, Co0.2-0.5wt%, Cu 10-
16wt%, nanometer Fe 0.1-0.3wt%, surplus Fe；
3. valve seating obtained, which is pre-sintered base merging multi-arc ion coating AIP equipment, carries out coating treatment, by in-furnace temperature
At 100-300 DEG C, cathode material uses titanium, chromium metal for control, and reaction gas is nitrogen, and vacuum chamber ground connection makees anode, vacuum chamber
It is interior use vacuum arc discharge, cathode material surface generate multi sphere highlight, evaporate cathode material, formed atom and from
Son；Under electric field action, atom and ion high velocity bombardment valve seating working surface, at the same time, high vacuum chamber is passed through reaction gas
Body can generate Multicomponent multilayer nano film coating in valve seating working surface.
Compared with prior art, the invention has the following advantages:
(1) coating TiN and CrN film layer alternately produce (at least 11 layers, or even numbers layer), to the same base of valve seating
Material, the microhardness of film increase as coating layers increase, and film layer overall thickness substantially increases the table of substrate up to 6-25um
Face microhardness, abrasion loss at various temperatures, can be well below the abrasion losses of traditional powder metallurgy (P/M) material.
(2) coating structure uses multi-component multi-layer nano-level thin-membrane, there is very high binding force between layer-interlayer and film-base.It receives
Rice film-substrate cohesion >=30N.
(3) design multilayer nanoscale film outermost layer is chromium nitride film layer.It is studied and experiment shows that its coefficient of friction exists
The coefficient of friction of slightly above traditional powder metallurgy (P/M) material when low temperature, and it is lower than traditional powder metallurgy (P/ at high temperature
M) the coefficient of friction of material is of great significance for working condition locating for powder metallurgy valve seat.
(4) TiN and CrN coating has very good wearability and refractory polishing machine.The wear-resistant of TiN coating is tradition
6-7 times of powder metallurgy (P/M) material, refractoriness is 2-3 times of traditional powder metallurgy (P/M) material.And this patent is adopted
The wearing layer formed with (11-21 layers) of the alternate Multicomponent multilayer nano film being laminated of TiN and CrN.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of wear-proof high hardness powder metallurgy valve seat of the present invention.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail:
Embodiment:
In-furnace temperature is limited to less than 300 DEG C of work item by wear-proof high hardness powder metallurgy valve seat and manufacture craft
Under part, using multi-arc ion plating equipment, using " multi-arc ion coating multi-layer nano membrane preparation technology ", in powder metallurgy valve seat table
Face is generated by alternate Multicomponent multilayer nano film (11-21 layers) shape being laminated of chromium nitride, titanium nitride and cobalt nitride and zirconium nitride
At wearing layer.
In conjunction with the accompanying drawings and embodiments, it as shown in Figure 1, the present invention is pre-sintered 1 surface of base matrix in powder metallurgy valve seat, adopts
Pretreatment layer 2 is formed with gas nitriding, then coating is layered on top of each other by TiN and CrN and is formed in multi-arc ion plating equipment, is layered
Mould thickness is 200-500nm, and hardness 1500-3000HV, overall thickness is 6-25 μm, nanometer film-substrate cohesion >=30N, than existing biography
The wearability of powder metallurgy (P/M) material of system improves 6-7 times.The first layer or outermost layer of Multicomponent multilayer nano film wearing layer 3
Coat chromium nitride layer.
This patent 4102Q diesel engine spiracle seat (rated speed 3500r/min, rated power 70KW), product is through east wind court
Positive Diesel Engine Co., Ltd's installation and performance test, consumers' opinions are as follows: the 4102Q diesel engine valve seating product delivered,
Performance test is carried out in my Products engineering department product testing room, test result shows: the product reaches design requirement, energy
Enough meet the working condition requirement of high-speed diesel engine.
Product film multiple stratification and the other alloying elements of addition, feature be with excellent bond strength, surface hardness,
Wearability and antioxygenic property resistant to high temperatures.The main application of product: the light-duty mating needs of vehicle high speed diesel engine engine and biography
Powder metallurgy (P/M) material of system is compared, and has the characteristics that energy-saving and environmental protection, and for this patent product there are also maximum feature, use is low
Alloy powder, price are only the 1/2 of high alloy material, and it is wear-resisting to not only increase product for the product produced using this patent technique
Performance, deep acceptor machine factory welcomes, and production cost is greatly lowered, and improves the market competitiveness.
Claims (5)
1. wear-proof high hardness powder metallurgy valve seat, it is characterised in that: apply multi sphere ionic metal AIP equipment, furnace will be controlled
Interior temperature, using multi-arc ion coating multi-layer nano-film preparation process, is generated in seating face by chromium nitride and nitrogen less than 300 DEG C
Change the wearing layer that the alternate Multicomponent multilayer nano film being laminated of titanium is formed.
2. wear-proof high hardness powder metallurgy valve seat according to claim 1, characterized in that the wearing layer is 11-
21 layers.
3. the manufacture craft of wear-proof high hardness powder metallurgy valve seat of any of claims 1 or 2, it is characterised in that: described
Preparation method the following steps are included:
1. selecting by hydraulic atomized low-alloy powder to be basic powder, it is pressed on automatic Powder molding machine；
2. the valve seating green compact of compression moulding are placed in push-down sintering furnace, it is sintered in ammonia dissolving atmosphere, sintering temperature
1100-1500 DEG C, sintering time 50-60 minutes；Using copper leaching technology, make sintered blank density >=7.6g/ ㎝3, sintered blank is hard
Spend HRC >=35；The sintered blank includes following components: C:0.7-1.2wt%, Cr:0.3-1.2wt%, Mo: 0.5-1.6wt%,
Ni:0.4-1.5wt%, Co:0.2-0.5wt%, Cu:10-16wt%, nanometer Fe 0.1-0.3wt%, surplus Fe；
3. valve seating obtained, which is pre-sintered base merging multi-arc ion coating AIP equipment, carries out coating treatment, in-furnace temperature is controlled
At 100-300 DEG C, cathode material uses titanium, chromium, and reaction gas is nitrogen, and vacuum chamber ground connection is made anode, used in vacuum chamber true
Empty arc discharge generates multi sphere highlight on cathode material surface, evaporates cathode material, form atom and ion；In electric field
Under effect, atom and ion high velocity bombardment valve seating working surface, at the same time, high vacuum chamber is passed through reaction gas, Ji Ke
Valve seating working surface generates the wearing layer that the Multicomponent multilayer nano film as made of being laminated between chromium nitride and TiN phase is formed.
4. the manufacture craft of wear-proof high hardness powder metallurgy valve seat according to claim 3, it is characterised in that: described
It is 200-500nm that wear-proof high hardness powder metallurgy valve seat, which is layered mould thickness, and hardness 1500-3000HV, overall thickness is 6-25 μ
M, nanometer film-substrate cohesion >=30N.
5. wear-proof high hardness powder metallurgy valve seat of any of claims 1-4 is applied to light-duty vehicle high speed bavin
Oil machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811634458.7A CN109794611A (en) | 2018-12-29 | 2018-12-29 | Wear-proof high hardness powder metallurgy valve seat and its manufacture craft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811634458.7A CN109794611A (en) | 2018-12-29 | 2018-12-29 | Wear-proof high hardness powder metallurgy valve seat and its manufacture craft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109794611A true CN109794611A (en) | 2019-05-24 |
Family
ID=66558018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811634458.7A Pending CN109794611A (en) | 2018-12-29 | 2018-12-29 | Wear-proof high hardness powder metallurgy valve seat and its manufacture craft |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110552752A (en) * | 2019-09-11 | 2019-12-10 | 瑞安市大顺气门有限公司 | Reinforced engine valve and preparation process thereof |
| CN110964987A (en) * | 2019-12-27 | 2020-04-07 | 仪征市昌达粉末冶金制品有限公司 | Preparation method of wear-resistant high-hardness powder metallurgy valve seat |
-
2018
- 2018-12-29 CN CN201811634458.7A patent/CN109794611A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110552752A (en) * | 2019-09-11 | 2019-12-10 | 瑞安市大顺气门有限公司 | Reinforced engine valve and preparation process thereof |
| CN110964987A (en) * | 2019-12-27 | 2020-04-07 | 仪征市昌达粉末冶金制品有限公司 | Preparation method of wear-resistant high-hardness powder metallurgy valve seat |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190524 |
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| WD01 | Invention patent application deemed withdrawn after publication |