WO2012152521A1 - Process for the heat treatment of pressed mouldings - Google Patents
Process for the heat treatment of pressed mouldings Download PDFInfo
- Publication number
- WO2012152521A1 WO2012152521A1 PCT/EP2012/056639 EP2012056639W WO2012152521A1 WO 2012152521 A1 WO2012152521 A1 WO 2012152521A1 EP 2012056639 W EP2012056639 W EP 2012056639W WO 2012152521 A1 WO2012152521 A1 WO 2012152521A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- section
- moulding
- sintering
- sintering section
- evaporation
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010438 heat treatment Methods 0.000 title claims abstract description 6
- 238000005245 sintering Methods 0.000 claims abstract description 59
- 238000000465 moulding Methods 0.000 claims abstract description 36
- 238000001704 evaporation Methods 0.000 claims abstract description 30
- 238000003825 pressing Methods 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 19
- 230000001590 oxidative Effects 0.000 claims abstract description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 39
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 230000001105 regulatory Effects 0.000 claims description 4
- 150000001408 amides Chemical class 0.000 claims 1
- 125000004435 hydrogen atoms Chemical class [H]* 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 239000004071 soot Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 description 10
- 239000000470 constituent Substances 0.000 description 8
- 239000007769 metal material Substances 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 230000001603 reducing Effects 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001681 protective Effects 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-M stearate Chemical class CCCCCCCCCCCCCCCCCC([O-])=O QIQXTHQIDYTFRH-UHFFFAOYSA-M 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N Tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000001419 dependent Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000001771 impaired Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- TXKRDMUDKYVBLB-UHFFFAOYSA-N methane;titanium Chemical compound C.[Ti] TXKRDMUDKYVBLB-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- KREXGRSOTUKPLX-UHFFFAOYSA-N octadecanoic acid;zinc Chemical compound [Zn].CCCCCCCCCCCCCCCCCC(O)=O.CCCCCCCCCCCCCCCCCC(O)=O KREXGRSOTUKPLX-UHFFFAOYSA-N 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
- F27B9/028—Multi-chamber type furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
- F27B9/029—Multicellular type furnaces constructed with add-on modules
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
- F27B9/045—Furnaces with controlled atmosphere
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
- F27B9/045—Furnaces with controlled atmosphere
- F27B9/047—Furnaces with controlled atmosphere the atmosphere consisting of protective gases
Abstract
Process for the heat treatment of at least one moulding 1, which has been pressed from at least one material powder and at least one pressing aid, in a continuous furnace 2 having an evaporation section 3 and a sintering section 4, said process comprising at least the following steps: a)the moulding 1 is introduced into the evaporation section 3, b)the moulding 1 is heated to a temperature which is suitable for the evaporation of the at least one pressing aid in the evaporation section 3, c)the moulding 1 is conveyed from the evaporation section 3 into the sintering section 4, d)the moulding 1 is heated to a temperature which lies below the melting temperature of the at least one material powder in the sintering section 4, e)at least one oxidizing gas, in particular carbon dioxide, is fed into the sintering section 4. With the teaching according to the invention, the targeted introduction of an oxidizing gas into the sintering section 4 of a continuous furnace 2 makes it possible to suppress the deposition of soot in the system and the carburization of metallic components and of the moulding 1 in the sintering section 4.
Description
Process for the heat treatment of pressed mouldings
The present invention relates to a process for the heat treatment of a moulding, which has been pressed from a material powder and a pressing aid, in a continuous furnace. The process is also referred to as sintering.
In sintering, first of all a moulding is pressed from a mixture of material powder, in particular metal or plastic powder, and a pressing aid. The pressed moulding is also referred to as a green compact. The moulding is heat-treated in a continuous furnace having an evaporation section and a sintering section. Before the actual sintering process in the sintering section, the pressing aid first of all has to be removed from the moulding. To remove the pressing aid, the moulding is heated to a temperature in the evaporation section at which the pressing aid evaporates. Then, the temperature of the moulding is increased to a temperature below the melting temperature of the material powder in the sintering section, in which case a bond is formed between the material powder particles by surface diffusion between the material powder particles and thus the moulding is bound. Both the evaporation of the pressing aid and the sintering itself take place in a suitable gas atmosphere, with the composition of the gas being adapted to the requirements in the various sections. The gases or gas mixtures are generally introduced counter to the conveying direction of the moulding. It is known that an oxidizing atmosphere is set in the evaporation section, such that the gases which form during the evaporation of the pressing aid, for example hydrogen (H2), carbon monoxide (CO) and hydrocarbons (CxHy), can be oxidized. In order to generate an oxidizing atmosphere, humidified nitrogen (N2), by way of example, is fed into the evaporation section. US 5,578,147 additionally discloses that the throughput rate of the mouldings or the furnace temperature is regulated during the evaporation process such that if possible all pressing aid constituents oxidize completely.
In order to obtain an optimum sintering result in the actual sintering process, it is necessary for a reducing atmosphere to be present in the sintering section, this being realized for example by feeding in hydrogen (H2).
In spite of the measures described above, such as feeding in the gas counter to the conveying direction of the mouldings and the regulated variation of the evaporation conditions, the evaporated, gaseous constituents of the pressing aid cannot always be prevented from passing into the sintering section. The presence of the evaporated pressing aid constituents and the high temperatures in the sintering section regularly lead to the carburization of metallic materials in the sintering section. Thus, for example, the conveyor belt of the continuous furnace, which is regularly produced from high-alloy, heat-resistant steel, is carburized in the sintering section and decarburized again outside. This intermittent carburization and decarburization of the conveyor belt leads to grain growth, depletion of alloying elements and embrittlement, which in turn can lead to considerable shortening of the service life of the conveyor belt and to loss of production, and this in turn leads to increased production costs. In addition, the sintering process is impaired by the inevitable carburization of the metallic material powder. Thus, inter alia, an excessive formation of soot is observed in the sintering section, as too are a reduction in the density and an increase in the hardness and brittleness of the sintered mouldings.
It is an object of the invention, therefore, to at least partially overcome the problems outlined with reference to the prior art, and in particular to specify a process in which the deposition of soot in the system and the carburization of metallic materials in a sintering section of a continuous furnace are avoided.
These obj ects are achieved by a process according to the features in the independent claim. Advantageous configurations of the process are indicated in the dependent patent claims. The features given individually in the claims can be combined with one another in any desired, technologically meaningful manner, and can be supplemented with explanatory information from the description, presenting further alternative embodiments of the invention.
These objects are achieved by a process for the heat treatment of at least one moulding, which has been pressed from at least one material powder and at least one pressing aid, in a continuous furnace having an evaporation section and a sintering section, said process comprising at least the following steps:
a) the moulding is introduced into the evaporation section,
b) the moulding is heated to a temperature which is suitable for the evaporation of the at least one pressing aid in the evaporation section, c) the moulding is conveyed from the evaporation section into the sintering section,
d) the moulding is heated to a temperature which lies below the melting temperature of the at least one material powder in the sintering section, e) at least one oxidizing gas is fed into the sintering section.
The material powder preferably comprises metallic powders, in particular powders of iron, copper, molybdenum, bronze and/or stainless steels with incorporated hard materials, for example tungsten carbide or titanium carbide.
The pressing aids preferably comprise stearates which contain a very high proportion of bound hydrocarbons. Zinc stearate is used with particular preference as the pressing aid (see for example "Kieback, Bernd (Editor): Pulvermetallurgie. Technologien und Werkstoffe [Powder Metallurgy. Technologies and Materials], 2nd edition").
The continuous furnace can be formed by a plurality of individual furnaces arranged in succession, in which case a temperature which is independent of the other furnaces can be set in each furnace. Alternatively, the furnace can comprise precisely one furnace in which a predefinable temperature profile can be set, where the sections are defined by the temperatures which prevail during operation. If appropriate, the individual sections of the furnace may also be separated from one another by skirts or the like, for example in order to reduce the gas exchange between the individual sections. The mouldings are preferably conveyed from an inlet of the continuous furnace to an outlet of the continuous furnace with the aid of a conveying apparatus, e.g. a conveyor belt. The moulding therefore initially passes through the evaporation section and then the sintering section on the conveyor belt. The sintering section of the continuous furnace is generally followed by cooling zones, in which the sintered moulding is cooled, usually in a protective gas atmosphere.
The temperature which prevails in step b) is at least so high that the pressing aid can evaporate completely, but not so high that a bond is formed with the material powder; in particular, the temperature in step b) is between 250°C and 700°C, preferably between 400°C and 6oo°C.
The temperature which prevails in step d) is in particular so high that a bond is formed with the material powder, but the latter just does not melt; in particular, the temperature in step d) is between 8oo°C and 1500°C, preferably between iooo°C and 1300°C.
According to the invention, and contrary to the opinion available to date, an oxidizing gas is fed into the sintering section. The intention of the oxidizing gas is to oxidize the gaseous pressing aid constituents which have passed into the sintering section, such that carburization of the metallic materials in the sintering section is suppressed. The carbon potential in the sintering section, which is a measure of the possible carburization, is therefore lowered to a non-critical level, and is in particular above the soot limit.
It is preferable for the oxygen partial pressure to be measured in the sintering section. On the basis of the oxygen partial pressure, it is possible to determine in particular the carbon potential in the sintering section, and therefore the amount of oxidizing gas fed in in step e) can preferably be regulated depending on the carbon potential. The oxygen partial pressure can be measured by means of known oxygen probes or known lambda probes. Therefore, the flow rate of the oxidizing gas fed in is increased or lowered until a predefined oxygen partial pressure is reached or until in particular a carbon potential of less than 0.2% is reached.
With very particular preference, carbon dioxide (C02) is fed in as the oxidizing gas in step e).
It is also preferable for a base gas comprising at least nitrogen (N2), hydrogen (H2) and/or methane (CH4) to be fed into the continuous furnace counter to a conveying direction of the moulding. The composition of the base gas can vary depending on the requirements in the individual sections of the continuous furnace. It is therefore preferable for a gas mixture of at most 5% oxidizing gas
with base gas as the remainder to be fed into the sintering section, where the base gas in the sintering section comprises at most 2% methane, 3% to 10% hydrogen and remainder nitrogen. In particular, the composition of the gas mixture depends on the nature of the mouldings, i.e. in particular on the geometry, on the material powder used, on the pressing aid used for the mouldings and on the conveying speed of the mouldings, and so on. It is particularly preferable for the pressing aid to be a stearate.
A further aspect of the invention proposes a continuous furnace for carrying out the process according to the invention, comprising an evaporation section, a sintering section, a conveying device for conveying the mouldings from an inlet to an outlet of the continuous furnace and at least one gas line for feeding gases into the sintering section.
It is preferable for the continuous furnace to comprise a measuring sensor for measuring the oxygen partial pressure in the sintering section.
It is preferable for the continuous furnace to furthermore comprise a control apparatus which is connected at least to the measuring sensor or a controllable valve in the at least one gas line. The details disclosed in relation to the process according to the invention can be transferred and applied to the apparatus according to the invention, and vice versa.
The invention and the technical field will be explained by way of example below on the basis of the figure. It should be pointed out that the figure shows a particularly preferred alternative embodiment of the invention, but the latter is not limited thereto. Schematically:
Fig.: shows a continuous furnace for carrying out the process according to the invention.
The figure schematically shows a continuous furnace 2 having an evaporation section 3, a sintering section 4, a cooling section 7 and a conveying device 5 for conveying at least one moulding 1 through the continuous furnace 2 from an inlet 12 to an outlet 13. The continuous furnace 2 furthermore comprises gas lines 6, by means of which gases or gas mixtures can be fed into the sections of the continuous furnace 2 via valves 10. To measure the oxygen partial pressure in the sintering section 4, provision is made of a measuring sensor 11, which is connected to a control apparatus 8 via a data line 9. The control apparatus 8 is furthermore connected to the valves 10 for providing a gas atmosphere with a gas composition in the sections of the sintering furnace 2.
The moulding 1 which has been pressed from a material powder and a pressing aid passes through the continuous furnace 2 from the inlet 12 to the outlet 13. The moulding 1 is first of all introduced into the evaporation section 3, where the pressing aid evaporates at temperatures of between 400°C and 6oo°C. Then, the moulding 1 passes into the sintering section 4, where the material powder is sintered at temperatures of between 1030°C and 1250°C. The sintered moulding is cooled in the cooling section 7 with the supply of a protective gas atmosphere.
The constituents of the pressing aid evaporate in the evaporation section 3, in particular with the release of hydrogen, carbon monoxide and hydrocarbons. However, since evaporated pressing aid constituents pass into the sintering section 4, carbon dioxide is added to the inherently reducing gas mixture of, for example, hydrogen and nitrogen in the sintering section 4. As a result, the pressing aid constituents which have passed into the sintering section 4 are oxidized, and carburization of the metallic constituents and the deposition of soot in the system in the sintering section 4 are avoided.
With the teaching according to the invention, the targeted introduction of an oxidizing gas into the sintering section 4 of a continuous furnace 2 makes it possible to suppress the deposition of soot in the system and the carburization of metallic materials, in particular of mouldings 1 in the sintering section 4.
List of reference symbols
1 Moulding
2 Continuous furnace
3 Evaporation section
4 Sintering section
5 Conveying device
6 Gas line
7 Cooling section
8 Control apparatus
9 Data line
10 Valve
11 Measuring sensor
12 Inlet
13 Outlet
Claims
Process for the heat treatment of at least one moulding (1), which has been pressed from at least one material powder and at least one pressing aid, in a continuous furnace (2) having an evaporation section (3) and a sintering section (4), said process comprising at least the following steps:
a) the moulding (1) is introduced into the evaporation section (3), b) the moulding (1) is heated to a temperature which is suitable for the evaporation of the at least one pressing aid in the evaporation section (3),
c) the moulding (1) is conveyed from the evaporation section (3) into the sintering section (4),
d) the moulding (1) is heated to a temperature which lies below the melting temperature of the at least one material powder in the sintering section (4),
e) at least one oxidizing gas is fed into the sintering section (4).
Process according to Claim 1, wherein the oxygen partial pressure is measured in the sintering section and the amount of oxidizing gas fed in in step e) is regulated depending on the oxygen partial pressure.
Process according to Claim 1 or 2, wherein carbon dioxide (C02) is fed in in step e).
Process according to one of the preceding claims, wherein a base gas comprising at least nitrogen (N2) and hydrogen (H2) is fed into the continuous furnace (2) counter to a conveying direction of the moulding (1).
Process according to one of the preceding claims, wherein the pressing aid is an amide wax.
6. Continuous furnace (2) for carrying out the process according to one of the preceding claims, comprising an evaporation section (3), a sintering
section (4), a conveying device (5) for conveying the at least one moulding
(I) and at least one gas line (6) for feeding gases into the sintering section (4).
Continuous furnace according to Claim 6, comprising a measuring sensor
(II) for measuring the oxygen partial pressure in the sintering section (4).
8. Continuous furnace according to Claim 6 or 7, having a control apparatus (8) which is connected at least to the measuring sensor (11) or a valve (10) in the at least one gas line (6).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011101264.1 | 2011-05-11 | ||
| DE102011101264.1A DE102011101264B4 (en) | 2011-05-11 | 2011-05-11 | Process for the heat treatment of pressed molded parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012152521A1 true WO2012152521A1 (en) | 2012-11-15 |
Family
ID=45953143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2012/056639 WO2012152521A1 (en) | 2011-05-11 | 2012-04-12 | Process for the heat treatment of pressed mouldings |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102011101264B4 (en) |
| WO (1) | WO2012152521A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3042967A1 (en) * | 2015-01-08 | 2016-07-13 | Linde Aktiengesellschaft | Gas mixture and method for controlling a carbon potential of a furnace atmosphere |
| EP3043135A1 (en) * | 2015-01-08 | 2016-07-13 | Linde Aktiengesellschaft | Apparatus and method for controlling a sintering process |
| JP2016527393A (en) * | 2013-07-01 | 2016-09-08 | アイゼンマン ソシエタス オイロペア | Method for sintering sintered workpieces and equipment therefor |
| CN112404449A (en) * | 2020-10-23 | 2021-02-26 | 中国科学技术大学 | Device and method for continuously synthesizing powder material based on thermal shock |
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|---|---|---|---|---|
| US5578147A (en) | 1995-05-12 | 1996-11-26 | The Boc Group, Inc. | Controlled process for the heat treating of delubed material |
| EP0745446A1 (en) * | 1995-06-01 | 1996-12-04 | Air Products And Chemicals, Inc. | Atmospheres for extending life of wire mesh belts used in sintering powder metal components |
| US6303077B1 (en) * | 1997-05-27 | 2001-10-16 | Höganäs Ab | Method of monitoring and controlling the composition of sintering atmosphere |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS589806B2 (en) * | 1977-03-30 | 1983-02-23 | Sumitomo Electric Industries | |
| DE19960095A1 (en) * | 1999-12-14 | 2001-07-05 | Bosch Gmbh Robert | Sintered soft magnetic composite and method for its production |
| DE102009004829A1 (en) * | 2009-01-13 | 2010-07-22 | Gkn Sinter Metals Holding Gmbh | Mixture to prevent surface stains |
-
2011
- 2011-05-11 DE DE102011101264.1A patent/DE102011101264B4/en active Active
-
2012
- 2012-04-12 WO PCT/EP2012/056639 patent/WO2012152521A1/en active Application Filing
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|---|---|---|---|---|
| US5578147A (en) | 1995-05-12 | 1996-11-26 | The Boc Group, Inc. | Controlled process for the heat treating of delubed material |
| EP0745446A1 (en) * | 1995-06-01 | 1996-12-04 | Air Products And Chemicals, Inc. | Atmospheres for extending life of wire mesh belts used in sintering powder metal components |
| US6303077B1 (en) * | 1997-05-27 | 2001-10-16 | Höganäs Ab | Method of monitoring and controlling the composition of sintering atmosphere |
Non-Patent Citations (1)
| Title |
|---|
| "Practical issues in the sintering of ferrous parts", METAL POWDER REPORT, MPR PUBLISHING SERVICES, SHREWSBURY, GB, vol. 49, no. 2, 1 February 1994 (1994-02-01), pages 26 - 30, XP024089131, ISSN: 0026-0657, [retrieved on 19940201], DOI: 10.1016/0026-0657(94)90421-9 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016527393A (en) * | 2013-07-01 | 2016-09-08 | アイゼンマン ソシエタス オイロペア | Method for sintering sintered workpieces and equipment therefor |
| EP3042967A1 (en) * | 2015-01-08 | 2016-07-13 | Linde Aktiengesellschaft | Gas mixture and method for controlling a carbon potential of a furnace atmosphere |
| EP3043135A1 (en) * | 2015-01-08 | 2016-07-13 | Linde Aktiengesellschaft | Apparatus and method for controlling a sintering process |
| WO2016110450A1 (en) * | 2015-01-08 | 2016-07-14 | Linde Aktiengesellschaft | Gas mixture and method for controlling a carbon potential of a furnace atmosphere |
| WO2016110449A1 (en) * | 2015-01-08 | 2016-07-14 | Linde Aktiengesellschaft | Apparatus and method for controlling a sintering process |
| CN107107197A (en) * | 2015-01-08 | 2017-08-29 | 林德股份公司 | Control the apparatus and method of sintering process |
| CN112404449A (en) * | 2020-10-23 | 2021-02-26 | 中国科学技术大学 | Device and method for continuously synthesizing powder material based on thermal shock |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102011101264A1 (en) | 2012-11-15 |
| DE102011101264B4 (en) | 2022-05-19 |
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