CN117206521A - Forming and sintering process of FS-53 high-strength alloy - Google Patents
Forming and sintering process of FS-53 high-strength alloy Download PDFInfo
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- CN117206521A CN117206521A CN202311202012.8A CN202311202012A CN117206521A CN 117206521 A CN117206521 A CN 117206521A CN 202311202012 A CN202311202012 A CN 202311202012A CN 117206521 A CN117206521 A CN 117206521A
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- 238000005245 sintering Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 28
- 239000000956 alloy Substances 0.000 title claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 15
- 238000005238 degreasing Methods 0.000 claims abstract description 20
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 230000003197 catalytic effect Effects 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 238000000280 densification Methods 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 7
- 230000032683 aging Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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Abstract
The application relates to a molding sintering process of an FS-53 high-strength alloy. The prior art is easy to cause the conditions of large size fluctuation and surface ash generation of the FS-53 material. The application adopts walking beam type sintering equipment to sinter, comprising degreasing, sintering and cooling, wherein the feed subjected to catalytic degreasing is transmitted into a sintering section by a conveying mesh belt, the sintering section comprises 5 preheating areas and 5 high-temperature areas, the temperature of the preheating areas is gradually increased along with the advancing of a walking beam, and the temperature of the preheating areas is increased from 250 ℃ to 700 ℃; the temperature of a high temperature 1 area in the 5 high temperature areas is 1050-1150 ℃, the temperature of a high temperature 2 area-high temperature 4 area is 1350-1370 ℃, the temperature of a high temperature 5 area is 1150 ℃, and the period of the walking beam is 448-600 s. The application improves the sintering efficiency and ensures that the product size, the carbon content and the mechanical property are more stable.
Description
Technical Field
The application relates to the field of metal part forming, in particular to a forming and sintering process of an FS-53 high-strength alloy.
Background
With market demands, demands of folding screen mobile phones are increasing. The use of high strength alloys in hinges has also been a trend to increase the wear and shatter resistance of folding screen hinges. The FS-53 material is a high-strength alloy material, and comprises the following specific components:
the material has higher tensile strength and yield strength, the hardness after aging is maintained at 550-590 Hv, the high hardness ensures that the material has good wear resistance, and the FS-53 material density is maintained at more than 7.75g/cm < 3 >, so that the material has good densification, and the wear resistance and the anti-falling performance of the material are further improved.
At present, the FS-53 material is sintered by adopting a two-zone temperature control vacuum furnace, and the specific technological parameters are as follows:
however, the above process is prone to the presence of FS-53 material with large dimensional fluctuations and graying surfaces. The large size fluctuation is caused by the fact that the vacuum furnace uses two areas for temperature control, the uniformity of the temperature in the furnace is poor, and the size fluctuation is large after the whole furnace is sintered at inconsistent temperature.
The surface ash generation is caused by the fact that the sintering densification temperature is higher than 1360 ℃ and the negative pressure state is adopted in the sintering process of the vacuum furnace, free carbon in the vacuum furnace and the ceramic plate to be sintered undergo carbothermic reduction aluminum oxide reaction under the condition, so that the ash generation phenomenon is easily generated on the surface of the material at the position with higher carbon potential in the furnace, and the size fluctuation is further amplified.
Therefore, the FS-53 material has higher temperature requirement in the heat treatment process, the temperature fluctuation can cause poor mechanical property, and the difficulty of the heat treatment process needs to be overcome.
Disclosure of Invention
Aiming at the problems, the application provides a molding sintering process of the FS-53 high-strength alloy, which improves the sintering efficiency and ensures that the product size, the carbon content and the mechanical property are more stable.
Therefore, the application adopts the following technical scheme: a molding sintering process of FS-53 high-strength alloy is characterized in that a walking beam type sintering device is adopted for sintering, the sintering comprises degreasing, sintering and cooling, a feed subjected to catalytic degreasing is transmitted into a sintering section by a conveying mesh belt, the sintering section comprises 5 preheating areas and 5 high-temperature areas, the temperature of the preheating areas is gradually increased along with the advancing of a walking beam, and the temperature of the preheating areas is increased from 250 ℃ to 700 ℃; the temperature of a high temperature 1 area in the 5 high temperature areas is 1050-1150 ℃, the temperature of a high temperature 2 area-high temperature 4 area is 1350-1370 ℃, the temperature of a high temperature 5 area is 1150 ℃, and the period of the walking beam is 448-600 s.
Preferably, the protective atmosphere in the sintering zone in the high temperature zone is Ar, and the Ar flow is kept between 28 and 32Nm 3 And/h, the furnace pressure is kept between 8 and 12mbar.
Preferably, the temperature of the preheating 1 area is 250-300 ℃, the temperature of the preheating 2 area is 350-400 ℃, the temperature of the preheating 3 area is 450-500 ℃, the temperature of the preheating 4 area is 550-600 ℃, and the temperature of the preheating 5 area is 650-700 ℃.
Preferably, the powder feed is transported from the feed section by a conveyor belt into a catalytic degreasing section, where nitric acid is used to remove a portion of the binder from the feed, and N2 is used as a shielding gas.
Preferably, the heat preservation time of the high temperature 2 region to the high temperature 4 region is 120-180min.
Preferably, the Ar flow is maintained at 30Nm 3 /h。
Preferably, the furnace pressure is maintained at 10mbar.
The beneficial effects of the application are as follows:
1. realizes the sintering of the FS-53 material in the walking beam sintering equipment, meets the standards of the material on size, hardness, density, carbon content and mechanical property, and simultaneously improves the ash generation phenomenon caused by carbothermic reduction of aluminum oxide in a vacuum furnace.
2. The sintering efficiency is greatly improved, the whole sintering period of the walking beam sintering equipment is only 14-18 hours, and the sintering period of the vacuum sintering equipment is 26 hours. The sintering efficiency is improved, the sintering cost is reduced, meanwhile, the labor cost is also effectively reduced, 4 persons are required to perform operation by using the vacuum sintering equipment, and only 2 persons are required to perform stepping Liang Shaojie equipment.
3. Because the walking beam sintering equipment continuously and stably operates, operations such as stopping operation and the like are not needed in a short time, the efficiency is improved to a certain extent, and the equipment has better stability.
Detailed Description
The application will be further illustrated with reference to specific examples.
The application discloses a molding sintering process of FS-53 high-strength alloy, which is characterized in that the molding sintering process is carried out by a conveyor belt from a feeding mesh belt into the interior of a hearth, and sintering is densified by adjusting the temperatures of different temperature areas and the stepping Liang Sulv in the interior of a furnace.
Firstly, powder feed is transmitted from a feed section to a catalytic degreasing section by a conveying net belt, a part of binder in the feed is removed by nitric acid, the temperature, the acid feeding amount of the nitric acid and the net belt speed are controlled in the degreasing process so as to control the proportion of removing the binder, and N2 is used as protective gas in the degreasing section to prevent the feed from rusting and oxidizing.
The feed after catalytic degreasing is transmitted into a sintering section by a transmission mesh belt, and the transmission rate of the feed is controlled by a walking beam in the sintering section. The sintering densification is achieved and good performance is maintained by adjusting the temperature of different temperature areas of the sintering section, the transmission rate of the walking beam and the sintering gas atmosphere.
After sintering densification, the walking beam passes through the highest temperature zone, enters a cooling section, and the metal powder is discharged from the furnace after being cooled by the furnace, and is changed from a feeding state to a metal state.
The sintering process is specifically as follows:
| preheating 1 | Preheating 2 | Preheating 3 | Preheating 4 | Preheating 5 |
| 250～300 | 350～400 | 450～500 | 550～600 | 650～700 |
| High temperature 1 | High temperature 2 | High temperature 3 | High temperature 4 | High temperature 5 |
| 1050～1150 | 1350～1370 | 1350～1370 | 1350～1370 | 1150 |
| H 2 Flow rate | Ar flow rate | N 2 Flow rate | Cycle time | Furnace pressure |
| 0Nm 3 /h | 28～32Nm 3 /h | 0Nm 3 /h | 448～600s | 8～12mbar |
The temperature adjustment of the preheating 1-5 area is mainly because the C content level of the FS-53 material needs to be controlled at a lower level (less than or equal to 0.03%), the continuous degreasing sintering furnace has lower overall furnace atmosphere replacement efficiency due to the sintering consistency, the organic atmosphere caused by the decomposition of the binder in the MIM feeding is easy to accumulate, and the C content is easy to exceed the upper limit in the long-term sintering process. Therefore, the temperature of the preheating zone 1-5 is properly reduced and adjusted, the carbon-oxygen reduction reaction time in the furnace is prolonged, and the content level of C in the material is controlled.
The temperature of the high temperature 1 area is adjusted to 1050-1150 ℃, which is mainly used for improving the rapid shrinkage reaction of materials, and the 1050-1150 ℃ is a special temperature formulated according to the shrinkage reaction of FS-53 materials.
The temperature of the high temperature 2-4 area is regulated to 1350-1370 ℃, mainly to ensure the density of the sintered material, and the FS-53 material has higher density than other stainless steel materials after sintering, so that a 3-section heat preservation process is adopted, the heat preservation time is prolonged, and densification of the material in the sintering process is ensured.
The temperature of the high temperature 5 region is 1150 ℃, so that a proper cooling rate can be maintained, and the material cannot crack excessively due to extremely cold internal stress.
Ar flow is kept at 28-32 Nm 3 And/h, the furnace pressure is kept between 8 and 12mbar. The flow and the furnace pressure mainly control the pressure in the furnace, and reduce the influence of the pressure on densification.
The cycle is maintained at 448-600 s, the cycle means the time for the walking beam to finish a forward and backward action, the 448-600 s cycle ensures that the material has a proper heat preservation time, the heat preservation time is 120-180min, and the higher production efficiency is ensured to be maintained while the material is densified.
Compared with common stainless steel and carbon steel MIM materials, the FS-53 material produced by the application has higher density and lower C content level, so that two problems of high density and low C content need to be overcome in the sintering process.
Firstly, aiming at low C content, a continuous degreasing sintering furnace is provided with 5 sections of preheating areas, the temperature is lower than 800 ℃, the temperature of the preheating areas is gradually increased from 250 ℃ to 700 ℃ along with the advancing of a walking beam, the integral temperature of the preheating areas is reduced, the excessively rapid temperature rise is prevented, and the sufficient reaction time is given to carbon and oxygen, so that the aim of low C content is fulfilled.
For high density, the protective atmosphere of the sintering section is Ar, and the Ar provides the functions of heat conduction and protection oxidation in the sintering process. The temperature setting of the sintering section, namely the temperature of zone 1 is 1050-1150 ℃, the temperature interval is an interval with proper shrinkage rate of the FS-53 material, the temperature setting mainly considers providing a proper shrinkage interval, provides a prior-stage matrix condition for high-temperature densification, and simultaneously prevents surface pores from closing to prevent further densification.
The temperature of the high temperature 2 zone to the high temperature 4 zone is 1350 ℃ to 1370 ℃, and the heat preservation time is prolonged and the densification degree is improved by adopting the measure of preserving heat at the same temperature in 3 sections of temperature zones. The temperature of the zone 5 is 1150 ℃, so that a proper cooling rate is maintained, and the material is not excessively cracked due to extremely cold internal stress.
The whole sintering atmosphere of the continuous degreasing sintering furnace is micro-positive pressure atmosphere, and the densification degree is weaker than that of the vacuum sintering furnace, so that 10mbar setting is carried out for the furnace pressure of the continuous degreasing sintering furnace, and the furnace pressure is reduced as much as possible while the micro-positive pressure is maintained, so that the densification degree is improved. At the same time Ar flow rate was set to 30Nm 3 And/h, ensuring that sufficient gas is filled into the furnace for heat conduction and protection.
Based on the temperature and pressure, the step Liang Zhouqi was 600s, i.e., the tapping rate of 6 molybdenum boxes was increased for 1 hour, and the density after tapping reached 7.75g/cm 3 The density requirements of the FS-53 material are met.
The high-strength performance of the FS-53 material is mainly reflected in mechanical properties and hardness after heat treatment, and the heat treatment process of the FS-53 material is solid solution and aging. Therefore, the continuous degreasing sintering furnace performs verification of specific products and mechanical property test strips. Solid solution verification at 1080 ℃ and aging verification at 500-560 ℃ are carried out on materials sintered by a continuous degreasing sintering furnace.
The heat treatment is carried out under the conditions of 1080 ℃ solid solution and 540 ℃ aging, and the obtained combination of mechanical property and hardness meets the performance standard of the material, so that the subsequent heat treatment process of the continuous degreasing sintering furnace material is also referred to solidification on the basis.
The final sintering and heat treatment properties of the material are as follows:
the application realizes the sintering of the FS-53 material in the walking beam sintering equipment, meets the standards of size, hardness, density, carbon content and mechanical property, and simultaneously improves the ash generation phenomenon caused by carbothermic reduction of alumina in a vacuum furnace.
It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
Claims (7)
1. A molding sintering process of FS-53 high-strength alloy is characterized in that a walking beam type sintering device is adopted for sintering, the sintering comprises degreasing, sintering and cooling, a feed subjected to catalytic degreasing is transmitted into a sintering section by a conveying mesh belt, the sintering section comprises 5 preheating areas and 5 high-temperature areas, the temperature of the preheating areas is gradually increased along with the advancing of a walking beam, and the temperature of the preheating areas is increased from 250 ℃ to 700 ℃; the temperature of a high temperature 1 area in the 5 high temperature areas is 1050-1150 ℃, the temperature of a high temperature 2 area-high temperature 4 area is 1350-1370 ℃, the temperature of a high temperature 5 area is 1150 ℃, and the period of the walking beam is 448-600 s.
2. The molding sintering process of FS-53 high strength alloy according to claim 1, wherein the protective atmosphere in the sintering zone is Ar, the Ar flow is maintained at 28-32 Nm 3 And/h, the furnace pressure is kept between 8 and 12mbar.
3. The molding and sintering process of the FS-53 high strength alloy according to claim 1 or 2, wherein the temperature of the preheating 1 zone is 250-300 ℃, the temperature of the preheating 2 zone is 350-400 ℃, the temperature of the preheating 3 zone is 450-500 ℃, the temperature of the preheating 4 zone is 550-600 ℃, and the temperature of the preheating 5 zone is 650-700 ℃.
4. A process for the shaped sintering of FS-53 high strength alloys as defined in claim 1, wherein the powder feed is transported from the feed section by a conveyor belt into a catalytic degreasing section, wherein nitric acid is used to remove a portion of the binder from the feed, and wherein N2 is used as a shielding gas in the catalytic degreasing section.
5. The molding and sintering process of the FS-53 high-strength alloy according to claim 1, wherein the heat preservation time of the high temperature 2 region to the high temperature 4 region is 120-180min.
6. A molding sintering process of FS-53 high strength alloy according to claim 2, wherein the Ar flow is maintained at 30Nm 3 /h。
7. A molding and sintering process for FS-53 high strength alloys according to claim 2 or 6, wherein the furnace pressure is maintained at 10mbar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311202012.8A CN117206521A (en) | 2023-09-18 | 2023-09-18 | Forming and sintering process of FS-53 high-strength alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311202012.8A CN117206521A (en) | 2023-09-18 | 2023-09-18 | Forming and sintering process of FS-53 high-strength alloy |
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| Publication Number | Publication Date |
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| CN117206521A true CN117206521A (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311202012.8A Pending CN117206521A (en) | 2023-09-18 | 2023-09-18 | Forming and sintering process of FS-53 high-strength alloy |
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| Country | Link |
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| CN (1) | CN117206521A (en) |
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- 2023-09-18 CN CN202311202012.8A patent/CN117206521A/en active Pending
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