CN101323066A - Powdered alloy for laser beam welding and method for preparing the same as well as use - Google Patents
Powdered alloy for laser beam welding and method for preparing the same as well as use Download PDFInfo
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- CN101323066A CN101323066A CNA2008103028728A CN200810302872A CN101323066A CN 101323066 A CN101323066 A CN 101323066A CN A2008103028728 A CNA2008103028728 A CN A2008103028728A CN 200810302872 A CN200810302872 A CN 200810302872A CN 101323066 A CN101323066 A CN 101323066A
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Abstract
The invention discloses an alloy powder for laser welding, the preparation method of the alloy powder, and the application of the alloy powder as a laser welding transition layer in the manufacturing of powder metallurgical parts and in particular diamond tools. The composition of the powder is Fe73+xCo25Cu2-x, wherein 0 is less than or equal to x and is less than 2; the weight percentages of the metal components are that: Fe is more than or equal to 73 and less than 75, Co is equal to 25, Cu is more than 0 and less than or equal to 2, and other components are unavoidable impurities. Compared with the prior art, the alloy powder of the invention has the advantages that, based on proper components and unique preparation technology, the prepared alloy powder has excellent component uniformity and adequate sintering reaction activity; the property of sinter lumps, and particularly the strength performance of laser welding are powerfully guaranteed, therefore the use safety and reliability of diamond tools are effectively improved, and the objective to reduce production cost by replacing ultra-fine cobalt powder is realized.
Description
(1) technical field:
The present invention relates to a kind of powdered alloy for laser beam welding and preparation method thereof and it application in powdered metal parts, particularly diamond tool are made as the laser weld transition zone.
(2) background technology:
Diamond tool is a kind of cutting and drilling tool that is applied to highway, stone material, art work etc.It is several mainly to be divided into saw blade, coring bit, rope saw etc.It is made mainly is characteristic according to processed material, matches corresponding diamond grade and quantity, and the diamond that apolegamy is good mixes in iron-based, the Ni-based or cobalt-based powder, makes the cutter head of different size through sintering.Because this cutter head hardness height, fragility are big, must be used in combination with steel matrix.Steel alloys such as the matrix adopting 30CrMo of diamond tool and 50Mn2V generally adopt laser welding method in the world at present.In order to guarantee the welding performance of diamond segment and matrix material, between steel matrix and diamond segment, add metal dust as transition zone, the height of 1.5-2mm is arranged usually.Transition zone fusing during laser weld, steel matrix and diamond segment junction partial melting, the alloy liquid after the fusing merges the formation weld seam mutually.Therefore the weld strength of transition zone directly has influence on the quality of laser welded diamond tool, the security and the reliability of use.
At present, using maximum laser weld metal dusts in the diamond tool is super-fine cobalt powder, and its Fisher particle size (FSSS) is less than 7 μ m.Other metal dust commonly used also has the mixture of submicron metal, as the mixture of thin iron powder, cobalt powder, copper powder and nickel powder.
From the angle of technology, use thin cobalt powder that the laser weld of diamond tool has been brought good result; But also there are some shortcomings in the use of a large amount of cobalts: major defect is higher price and strong price fluctuation; Simultaneously, cobalt is also under a cloud harmful to environment.Therefore, the pure cobalt of a large amount of uses is unfavorable for reducing production costs with powder as laser weld in diamond tool.
Use the mixture of submicron metal no doubt can reach the purpose that reduces cost, but, reduced the safety in utilization and the reliability of laser welded diamond tool because there is the defective of uneven components in mixed metal powder.
(3) summary of the invention:
The present invention provides a kind of employing co-precipitation-calcining-reduction technique preparation for reducing the production cost of diamond tool, with Fe, Co be base, Cu is as the alloy powder of solution strengthening element on a small quantity, alternative super-fine cobalt powder is as the laser weld powder.
Technical scheme of the present invention: powdered alloy for laser beam welding, it consist of Fe
73+xCo
25Cu
2-x, 0≤x＜2 wherein, promptly the mass percent of each metal component is: 73≤Fe＜75, Co=25,0＜Cu≤2, all the other components are unavoidable impurities.
The thing of described alloy powder is based on Co
3Fe
7-CoFe two-phase system is at Co
3Fe
7Contain Cu in the-CoFe two-phase as the solution strengthening element.
The Fisher particle size FSSS of described alloy powder≤15 μ m is preferably FSSS≤10 μ m.Thinner powder size can guarantee that powder has bigger table specific area, helps the raising of powder sintered reactivity, helps improving laser weld strength.
Total oxygen content≤the 2wt.% of described alloy powder is preferably total oxygen content≤1wt.% (method according to standard ISO 4491-4:1989 is measured).The existence of oxygen all has adverse effect to the sintering activity of powder and the laser weld strength of agglomerate, so oxygen content requires to be controlled at a lower level.
Powdered alloy for laser beam welding of the present invention is preparation like this: the composite metal salt sediment that at first prepares selected components by liquid phase coprecipitation, the composite metal salt sediment obtains the burning composite powder through calcining, again the burning composite powder is reduced with hydrogen or decomposed ammonia in reduction furnace, finish alloying process in the reduction process simultaneously, promptly obtain powdered alloy for laser beam welding.This preparation method specifically may further comprise the steps:
1) preparation of solution: the interpolation equivalent that calculates each metal ion according to the composition of alloy powder, one or more and deionized water in the solubility villaumite of iron, cobalt, copper, sulfate, the nitrate are mixed with the aqueous solution, import in the liquid feeding still concentration≤1.8mol/L of 0＜each metal ion species; Calculate the interpolation equivalent of precipitating reagent according to the composition of alloy powder, precipitating reagent with excessive 10%～20% and deionized water are mixed with the aqueous solution that equates with the metal salt solution volume, import in another liquid feeding still.
2) coprecipitation reaction: metal salt solution and precipitant solution joined respectively by the liquid feeding still carry out coprecipitation reaction in the reactor, fully stir; The pH value that adds ammoniacal liquor or oxalic acid solution conditioned reaction solution again is faintly acid or alkalescent; React after 20～40 minutes, staticly settled 2～4 hours, get the composite metal salt sediment.
3) filter, washing and dry: the composite metal salt sediment separates after filtration, with deionized water washing and precipitating thing, removes foreign ion, and the electrical conductivity of filtrate places sediment drying box to remove surperficial adsorbed water during less than 20 μ s/cm again.
4) calcining: the composite metal salt sediment is put into the push rod calcining furnace or rotary furnace is calcined, calcining heat is 400～550 ℃, calcination time 50～90 minutes (make part surface water, crystallization water volatilization, impurity, sediment fully decompose), the burning composite powder.
5) reduction: the burning composite powder is changed in push rod reduction furnace or the steel band reduction furnace, reduce, 600～800 ℃ of reduction temperatures, the flow 2～4m of hydrogen or decomposed ammonia with hydrogen or decomposed ammonia
3/ h, 50～90 minutes recovery times, the metal that is reduced is out finished alloying process by diffusion under reduction temperature, gets alloy powder.Powder Fisher particle size value (FSSS) is no more than 15 μ m, preferably is no more than 10 μ m; The powder total oxygen content is no more than 2wt.%, preferably is no more than 1wt.%
Under the sufficient situation of reducing atmosphere, can control the granularity and the oxygen content of alloy powder by adjusting reduction temperature and recovery time.Following two principles are followed in the selection of reduction temperature and recovery time: if 1. the Fisher particle size of alloy powder (FSSS) is too big, then reduce reduction temperature; If 2. the oxygen content of alloy powder is too high, then increase the recovery time.
6) post processing: alloy powder is through crushing and screening, and vacuum packaging gets product.
Above-described precipitating reagent is oxalic acid, oxalates, carbonate or alkali (as NaOH, potassium hydroxide etc.).According to above-mentioned steps 1) narration, precipitating reagent need be mixed with the aqueous solution and use, therefore described precipitating reagent is water-soluble substances.
During as precipitating reagent (acidic precipitation agent), the concentration of precipitant solution is 1.4～2.4mol/L to step 1), step 2 with oxalic acid, oxalates or carbonate) in add pH value to 4.5～6.5 of ammoniacal liquor conditioned reaction solution during coprecipitation reaction; During as precipitating reagent, the concentration of precipitant solution is 3.0～5.0mol/L to step 1), step 2 with alkali) in add pH value to 9.0～10.0 of oxalic acid solution conditioned reaction solution during coprecipitation reaction.
Step 2) metal salt solution and precipitant solution join in the reactor respectively with same rate mutually by the liquid feeding still in.
Powdered alloy for laser beam welding of the present invention can be applicable to powdered metal parts make in as the transition zone of laser weld.
Powdered alloy for laser beam welding of the present invention be particularly suitable for being applied in diamond tool make in as the transition zone of laser weld.
Compared with prior art, alloy powder of the present invention is based on suitable component and special preparation technology, the alloy powder for preparing has good homogeneity of ingredients and enough sintering reaction activity, strong guarantee the performance of agglomerate, laser weld strength performance particularly, thereby effectively improved the safety in utilization and the reliability of diamond tool, reached the purpose of alternative super-fine cobalt powder to reduce production costs.
(4) description of drawings:
Fig. 1 is the exemplary x-ray diffracting spectrum of powdered alloy for laser beam welding of the present invention.
(5) specific embodiment:
Embodiments of the invention 1: with four water frerrous chloride (FeCl
24H
2O), CoCL2 (CoCl
26H
2O), copper chloride dihydrate (CuCl
22H
2O) and oxalic acid (H
2C
2O
42H
2O) be raw material, adopt the pH value of ammoniacal liquor conditioned reaction solution, preparation Fe
73Co
25Cu
2Powdered alloy for laser beam welding, note is made powder 1.
The concrete steps of preparation are as follows:
(1) presses mass ratio (FeCl
24H
2O): (CoCl
26H
2O): (CuCl
22H
2O): (H
2C
2O
42H
2O)=and 2599: 1009: 54: 2667 ratio takes by weighing raw material.Four water frerrous chlorides, CoCL2 and copper chloride dihydrate are poured in the liquid feeding still, and then added deionized water, be mixed with Fe
2+Concentration is 1.17mol/L, Co
2+Concentration is 0.38mol/L, Cu
2+Concentration is the aqueous solution of 0.028mol/L.Pour oxalic acid into another liquid feeding still, add deionized water then, be mixed with the oxalic acid solution that concentration is 1.9mol/L.
(2) metal salt solution and oxalic acid solution are joined respectively with same rate mutually by the liquid feeding still carry out coprecipitation reaction in the reactor, fully stir; Add ammonia spirit and adjust the pH value to 5.5 of reaction solution, react after 20 minutes, staticly settled 2 hours, obtain the compound oxalate precipitation thing of iron, cobalt, copper.
(3) sediment separates after filtration, with deionized water washing and precipitating thing, removes foreign ion, and the electrical conductivity of filtrate places sediment drying box to remove surperficial adsorbed water during less than 20 μ s/cm again.
(4) sediment is put into the push rod calcining furnace and calcined, calcining heat is 500 ℃, and calcination time is 70 minutes, and the compound oxalate precipitation thing of iron, cobalt, copper is fully decomposed, and obtains the composite oxide power of iron, cobalt, copper.
(5) oxide powder is put into the push rod reduction furnace and reduced with decomposed ammonia, 700 ℃ of reduction temperatures, the flow of decomposed ammonia are 2.5m
3/ h, the recovery time is 70 minutes, obtains Fisher particle size value (FSSS) and equals 4.2 μ m, total oxygen content equals the alloy powder of 0.55wt.%.
(6) alloy powder is behind crushing and screening, and vacuum packaging gets product immediately.
Embodiments of the invention 2: with four water frerrous chloride (FeCl
24H
2O), cobalt nitrate hexahydrate (Co (NO
3)
36H
2O), two water copper nitrate (Cu (NO
3)
22H
2O) and oxalic acid (H
2C
2O
42H
2O) be raw material, adopt the pH value of ammoniacal liquor conditioned reaction solution, preparation Fe
73.5Co
25Cu
1.5Powdered alloy for laser beam welding, note is made powder 2.
The concrete steps of preparation are as follows:
(1) presses mass ratio (FeCl
24H
2O): (Co (NO
3)
36H
2O): (Cu (NO
3)
22H
2O): (H
2C
2O
42H
2O)=and 2616: 1235: 57: 2668 ratio takes by weighing raw material.Four water frerrous chlorides, cobalt nitrate hexahydrate and two water copper nitrates are poured in the liquid feeding still, and then added deionized water, be mixed with Fe
2+Concentration is 1.49mol/L, Co
2+Concentration is 0.48mol/L, Cu
2+Concentration is the aqueous solution of 0.027mol/L.Pour oxalic acid into another liquid feeding still, add deionized water then, be mixed with the oxalic acid solution that concentration is 2.4mol/L.
(2) metal salt solution and oxalic acid solution are joined respectively with same rate mutually by the liquid feeding still carry out coprecipitation reaction in the reactor, fully stir; Add ammonia spirit and adjust the pH value to 6.5 of reaction solution, react after 25 minutes, staticly settled 2.5 hours, obtain the compound oxalate precipitation thing of iron, cobalt, copper.
(3) sediment separates after filtration, with deionized water washing and precipitating thing, removes foreign ion, and the electrical conductivity of filtrate places sediment drying box to remove surperficial adsorbed water during less than 20 μ s/cm again.
(4) sediment is put into the push rod calcining furnace and calcined, calcining heat is 550 ℃, and calcination time is 50 minutes, and the compound oxalate precipitation thing of iron, cobalt, copper is fully decomposed, and obtains the composite oxide power of iron, cobalt, copper.
(5) oxide powder is put into the push rod reduction furnace and reduced with decomposed ammonia, 800 ℃ of reduction temperatures, the flow of decomposed ammonia are 4m
3/ h, the recovery time is 50 minutes, obtains Fisher particle size value (FSSS) and equals 4.7 μ m, total oxygen content equals the alloy powder of 0.47wt.%.
(6) alloy powder is behind crushing and screening, and vacuum packaging gets product immediately.
Embodiments of the invention 3: with ferrous sulfate heptahydrate (FeSO
47H
2O), cobalt sulfate (CoSO
47H
2O), cupric sulfate pentahydrate (CuSO
45H
2O) and oxalic acid (H
2C
2O
42H
2O) be raw material, adopt the pH value of ammoniacal liquor conditioned reaction solution, preparation Fe
74Co
25Cu
1Powdered alloy for laser beam welding, note is made powder 3.
The concrete steps of preparation are as follows:
(1) presses mass ratio (FeSO
47H
2O): (CoSO
47H
2O): (CuSO
45H
2O): (H
2C
2O
42H
2O)=and 3684: 1193: 39: 2670 ratio takes by weighing raw material.Ferrous sulfate heptahydrate, cobalt sulfate and cupric sulfate pentahydrate are poured in the liquid feeding still, and then added deionized water, be mixed with Fe
2+Concentration is 0.88mol/L, Co
2+Concentration is 0.28mol/L, Cu
2+Concentration is the aqueous solution of 0.010mol/L.Pour oxalic acid into another liquid feeding still, add deionized water then, be mixed with the oxalic acid solution that concentration is 1.4mol/L.
(2) metal salt solution and oxalic acid solution are joined respectively with same rate mutually by the liquid feeding still carry out coprecipitation reaction in the reactor, fully stir; Add ammonia spirit and adjust the pH value to 4.5 of reaction solution, react after 30 minutes, staticly settled 3 hours, obtain the compound oxalate precipitation thing of iron, cobalt, copper.
(3) sediment separates after filtration, with deionized water washing and precipitating thing, removes foreign ion, and the electrical conductivity of filtrate places sediment drying box to remove surperficial adsorbed water during less than 20 μ s/cm again.
(4) sediment is put into the push rod calcining furnace and calcined, calcining heat is 400 ℃, and calcination time is 80 minutes, and the compound oxalate precipitation thing of iron, cobalt, copper is fully decomposed, and obtains the composite oxide power of iron, cobalt, copper.
(5) oxide powder is put into the push rod reduction furnace and reduced with hydrogen, 650 ℃ of reduction temperatures, the flow of hydrogen are 2m
3/ h, the recovery time is 80 minutes, obtains Fisher particle size value (FSSS) and equals 4.0 μ m, total oxygen content equals the alloy powder of 0.58wt.%.
(6) alloy powder is behind crushing and screening, and vacuum packaging gets product immediately.
Embodiments of the invention 4: with four water frerrous chloride (FeCl
24H
2O), CoCL2 (CoCl
26H
2O), copper chloride dihydrate (CuCl
22H
2O) and NaOH be raw material, adopt oxalic acid (H
2C
2O
42H
2O) the pH value of conditioned reaction solution, preparation Fe
74.5Co
25Cu
0.5Powdered alloy for laser beam welding, note is made powder 4.
The concrete steps of preparation are as follows:
(1) presses mass ratio (FeCl
24H
2O): (CoCl
26H
2O): (CuCl
22H
2O): (NaOH)=2652: 1009: 13: 1554 ratio takes by weighing raw material.Four water frerrous chlorides, CoCL2 and copper chloride dihydrate are poured in the liquid feeding still, and then added deionized water, be mixed with Fe
2+Concentration is 1.37mol/L, Co
2+Concentration is 0.44mol/L, Cu
2+Concentration is the aqueous solution of 0.008mol/L.Pour NaOH into another liquid feeding still, add deionized water then, be mixed with the sodium hydroxide solution that concentration is 4.0mol/L.
(2) metal salt solution and sodium hydroxide solution are joined respectively with same rate mutually by the liquid feeding still carry out coprecipitation reaction in the reactor, fully stir; Add oxalic acid solution and adjust the pH value to 9.5 of reaction solution, react after 35 minutes, staticly settled 3.5 hours, obtain the complex hydroxide precipitation of iron, cobalt, copper.
(3) sediment separates after filtration, with deionized water washing and precipitating thing, removes foreign ion, and the electrical conductivity of filtrate places sediment drying box to remove surperficial adsorbed water during less than 20 μ s/cm again.
(4) sediment is put into the push rod calcining furnace and calcined, calcining heat is 500 ℃, and calcination time is 60 minutes, and the complex hydroxide precipitation of iron, cobalt, copper is fully decomposed, and obtains the composite oxide power of iron, cobalt, copper.
(5) oxide powder is put into the push rod reduction furnace and reduced with hydrogen, 750 ℃ of reduction temperatures, the flow of hydrogen are 3m
3/ h, the recovery time is 60 minutes, obtains Fisher particle size value (FSSS) and equals 4.4 μ m, total oxygen content equals the alloy powder of 0.51wt.%.
(6) alloy powder is behind crushing and screening, and vacuum packaging gets product immediately.
Embodiments of the invention 5: with four water frerrous chloride (FeCl
24H
2O), CoCL2 (CoCl
26H
2O), copper chloride dihydrate (CuCl
22H
2O) and sodium carbonate (Na
2CO
3) be raw material, adopt the pH value of ammoniacal liquor conditioned reaction solution, preparation Fe
73Co
25Cu
2Powdered alloy for laser beam welding, note is made powder 5.
The concrete steps of preparation are as follows:
(1) presses mass ratio (FeCl
24H
2O): (CoCl
26H
2O): (CuCl
22H
2O): (Na
2CO
3)=2599: 1009: 54: 2242 ratio takes by weighing raw material.Four water frerrous chlorides, CoCL2 and copper chloride dihydrate are poured in the liquid feeding still, and then added deionized water, be mixed with Fe
2+Concentration is 1.17mol/L, Co
2+Concentration is 0.38mol/L, Cu
2+Concentration is the aqueous solution of 0.028mol/L.Pour sodium carbonate into another liquid feeding still, add deionized water then, be mixed with the sodium carbonate liquor that concentration is 1.9mol/L.
(2) metal salt solution and sodium carbonate liquor are joined respectively with same rate mutually by the liquid feeding still carry out coprecipitation reaction in the reactor, fully stir; Add ammonia spirit and adjust the pH value to 6.5 of reaction solution, react after 40 minutes, staticly settled 4 hours, obtain the compound carbonate sediment of iron, cobalt, copper.
(3) sediment separates after filtration, with deionized water washing and precipitating thing, removes foreign ion, and the electrical conductivity of filtrate places sediment drying box to remove surperficial adsorbed water during less than 20 μ s/cm again.
(4) sediment is put into rotary furnace and calcine, calcining heat is 500 ℃, and calcination time is 90 minutes, and the compound carbonate sediment of iron, cobalt, copper is fully decomposed, and obtains the composite oxide power of iron, cobalt, copper.
(5) oxide powder is put into the steel band reduction furnace and reduced with decomposed ammonia, 600 ℃ of reduction temperatures, the flow of decomposed ammonia are 3m
3/ h, the recovery time is 90 minutes, obtains Fisher particle size value (FSSS) and equals 4.3 μ m, total oxygen content equals the alloy powder of 0.51wt.%.
(6) alloy powder is behind crushing and screening, and vacuum packaging gets product immediately.
Experimental example: the welding experiment of powdered alloy for laser beam welding
The applicant tests the laser weldability of the prepared powder 1 of embodiment of the invention 1-5, powder 2, powder 3, powder 4, powder 5 and super-fine cobalt powder.BS En13236:2001 Europe safety standard is carried out in the detection of weld strength, and weld strength requires to be not less than 600MPa.
Use powder 1, powder 2, powder 3, powder 4, powder 5 and super-fine cobalt powder to carry out the laser weld test as the transition zone of diamond tool, and detect weld strength, the results are shown in Table 1, table 2, the data in the table are the mean value of 100 weld strengths.
Soldering test equipment: Germany produces the DCO25 CO slab
2Laser instrument (calibration power 2500W, wavelength 10.6 μ m); Korea S produces the LWB15/20 laser beam welding workstation.
Welding condition: laser power 1200W, speed of welding 33.3mm/s, defocusing amount-0.8mm, two-sided welding.
Saw blade condition: (1) matrix material 30CrMo, thickness 2.2mm; The test tip size is 40 * 10 * 3.2 (length * height * thick) mm
3, cutter head all adopts powder 1, powder 2, powder 3, powder 4, powder 5 and super-fine cobalt powder sintering to form; Sintering temperature is respectively 790 ℃, 820 ℃, 850 ℃ and 880 ℃, and sintering pressure is 30MPa; (2) matrix material 50Mn2V, thickness 3.3mm; The test tip size is 40 * 10 * 4.4 (length * height * thick) mm
3, cutter head all adopts powder 1, powder 2, powder 3, powder 4, powder 5 and super-fine cobalt powder sintering to form; Sintering temperature is respectively 790 ℃, 820 ℃, 850 ℃ and 880 ℃, and sintering pressure is 30MPa.
The weld strength of table 1 alloy powder of the present invention (matrix material 30CrMo)
The weld strength of table 2 alloy powder of the present invention (matrix material 50Mn2V)
By table 1 and table 2 as seen, the laser weld strength of powder 1, powder 2, powder 3, powder 4 and powder 5 that the present invention is prepared meets BS En13236:2001 Europe safety standard fully, and the welding performance of the welding performance of alloy powder of the present invention and super-fine cobalt powder is close, can substitute super-fine cobalt powder fully.
Claims (12)
1. powdered alloy for laser beam welding is characterized in that: it consist of Fe73+xCo25Cu2x, 0≤x＜2 wherein, promptly the mass percent of each metal component is: 73≤Fe＜75, Co=25,0＜Cu≤2, all the other components are unavoidable impurities.
2. powdered alloy for laser beam welding according to claim 1 is characterized in that: the thing of described alloy powder contains the Cu as the solution strengthening element based on Co3Fe7-CoFe two-phase system in the Co3Fe7-CoFe two-phase.
3. powdered alloy for laser beam welding according to claim 1 is characterized in that: the Fisher particle size FSSS of described alloy powder≤15 μ m.
4. powdered alloy for laser beam welding according to claim 3 is characterized in that: the Fisher particle size FSSS of described alloy powder≤10 μ m.
5. powdered alloy for laser beam welding according to claim 1 is characterized in that: the total oxygen content≤2wt.% of described alloy powder.
6. powdered alloy for laser beam welding according to claim 5 is characterized in that: the total oxygen content≤1wt.% of described alloy powder.
7. the preparation method of each described powdered alloy for laser beam welding among the claim 1-6 is characterized in that: may further comprise the steps:
1) preparation of solution: the interpolation equivalent that calculates each metal ion according to the composition of alloy powder, one or more and deionized water in the solubility villaumite of iron, cobalt, copper, sulfate, the nitrate are mixed with the aqueous solution, import in the liquid feeding still concentration≤1.8mol/L of 0＜each metal ion species; Calculate the interpolation equivalent of precipitating reagent according to the composition of alloy powder, the precipitating reagent with excessive 10%～20% is mixed with the aqueous solution that equates with the metal salt solution volume with deionized water, imports in another liquid feeding still;
2) coprecipitation reaction: metal salt solution and precipitant solution joined respectively by the liquid feeding still carry out coprecipitation reaction in the reactor, fully stir; The pH value that adds ammoniacal liquor or oxalic acid solution conditioned reaction solution again is faintly acid or alkalescent; React after 20～40 minutes, staticly settled 2～4 hours, get the composite metal salt sediment;
3) filter, washing and dry: the composite metal salt sediment separates after filtration, with deionized water washing and precipitating thing, removes foreign ion, and the electrical conductivity of filtrate places sediment drying box to remove surperficial adsorbed water during less than 20 μ s/cm again;
4) calcining: the composite metal salt sediment is put into the push rod calcining furnace or rotary furnace is calcined, calcining heat is 400～550 ℃, calcination time 50～90 minutes, the burning composite powder;
5) reduction: the burning composite powder is changed in push rod reduction furnace or the steel band reduction furnace, reduce with hydrogen or decomposed ammonia, 600～800 ℃ of reduction temperatures, flow 2～the 4m3/h of hydrogen or decomposed ammonia, 50～90 minutes recovery times, the metal that is reduced is out finished alloying process by diffusion under reduction temperature, get alloy powder;
6) post processing: alloy powder is through crushing and screening, and vacuum packaging gets product.
8. according to the preparation method of the described powdered alloy for laser beam welding of claim 7, it is characterized in that: described precipitating reagent is oxalic acid, oxalates, carbonate or alkali.
9. according to the preparation method of claim 7 or 8 described powdered alloy for laser beam welding, it is characterized in that: step 1) is with oxalic acid, oxalates or carbonate during as precipitating reagent, the concentration of precipitant solution is 1.4～2.4mol/L, step 2) in add pH value to 4.5～6.5 of ammoniacal liquor conditioned reaction solution during coprecipitation reaction; During as precipitating reagent, the concentration of precipitant solution is 3.0～5.0mol/L to step 1), step 2 with alkali) in add pH value to 9.0～10.0 of oxalic acid solution conditioned reaction solution during coprecipitation reaction.
10. according to the preparation method of the described powdered alloy for laser beam welding of claim 7, it is characterized in that: step 2) in metal salt solution and precipitant solution join in the reactor respectively with same rate mutually by the liquid feeding still.
11. among the claim 1-6 each described powdered alloy for laser beam welding in powdered metal parts is made as the application of laser weld transition zone.
12. among the claim 1-6 each described powdered alloy for laser beam welding in diamond tool is made as the application of laser weld transition zone.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102649161A (en) * | 2011-02-23 | 2012-08-29 | 荆门市格林美新材料有限公司 | Nickel powder with large furnace safety supervision system (FSSS) particle size and preparation method thereof |
| CN102649161B (en) * | 2011-02-23 | 2014-11-05 | 荆门市格林美新材料有限公司 | Nickel powder with large furnace safety supervision system (FSSS) particle size and preparation method thereof |
| CN106180744A (en) * | 2016-08-25 | 2016-12-07 | 董晓 | A kind of preparation method of diamond composition pre-alloyed powder |
| CN107243644A (en) * | 2017-05-25 | 2017-10-13 | 河南工业大学 | A kind of preparation method of the diamond tool copper-based prealloy powder of ultra-fine quaternary |
| CN108746656A (en) * | 2018-06-15 | 2018-11-06 | 威海职业学院 | Prealloy powder and preparation method thereof for diamond composition |
| CN109736713A (en) * | 2019-01-08 | 2019-05-10 | 江苏友美工具有限公司 | A kind of diamond core bit and its laser welding preparation process |
| CN109736712A (en) * | 2019-01-08 | 2019-05-10 | 江苏友美工具有限公司 | Laser welding diamond core bit |
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