CN105312556A - Ultrafine high-bending resistance alloy powder used for diamond tool and preparation method for ultrafine high-bending resistance alloy powder - Google Patents
Ultrafine high-bending resistance alloy powder used for diamond tool and preparation method for ultrafine high-bending resistance alloy powder Download PDFInfo
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- CN105312556A CN105312556A CN201510845249.7A CN201510845249A CN105312556A CN 105312556 A CN105312556 A CN 105312556A CN 201510845249 A CN201510845249 A CN 201510845249A CN 105312556 A CN105312556 A CN 105312556A
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- 239000000843 powder Substances 0.000 title claims abstract description 73
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 43
- 239000000956 alloy Substances 0.000 title claims abstract description 43
- 239000010432 diamond Substances 0.000 title claims abstract description 41
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000005452 bending Methods 0.000 title abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 238000009692 water atomization Methods 0.000 claims abstract description 11
- 238000001291 vacuum drying Methods 0.000 claims abstract description 9
- 230000009467 reduction Effects 0.000 claims description 18
- 238000000889 atomisation Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 11
- 229910052718 tin Inorganic materials 0.000 claims description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 10
- 230000018044 dehydration Effects 0.000 claims description 10
- 238000006297 dehydration reaction Methods 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 241001062472 Stokellia anisodon Species 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 229910052746 lanthanum Inorganic materials 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- 229910052758 niobium Inorganic materials 0.000 claims description 5
- 239000000049 pigment Substances 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000007499 fusion processing Methods 0.000 claims description 3
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- 239000003595 mist Substances 0.000 claims description 3
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- 239000007791 liquid phase Substances 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 abstract 1
- ORILYTVJVMAKLC-UHFFFAOYSA-N adamantane Chemical compound C1C(C2)CC3CC1CC2C3 ORILYTVJVMAKLC-UHFFFAOYSA-N 0.000 description 9
- 229910001573 adamantine Inorganic materials 0.000 description 8
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- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 4
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- 150000001875 compounds Chemical class 0.000 description 2
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Abstract
The invention discloses ultrafine high-bending resistance alloy powder used for a diamond tool and a preparation method for the ultrafine high-bending resistance alloy powder. The ultrafine high-bending resistance alloy powder comprises the following components in percentage by weight: 5-75% of Cu, 1-15% of Ni, 1-15% of Sn, 1-5% of Si, 1-15% of Al, 1-10% of Cr, 0.1-3% of B, 0.1-3% of V, 0.1-2% of Nb, 0.1-4% of Zr, 0.1-7% of La and the balance of Fe. According to the preparation method, the prepared metal raw materials are subjected to the following steps of operation: (1), smelting; (2), water atomizing; (3), filter pressing and dewatering; (4), vacuum drying; and (5), restoring. According to the invention, the single power particle component uniformity is improved, and meanwhile, extremely high sintering activity is realized. Especially, micro liquid phase sintering is promoted due to the added low-melting point elements, so that higher density is obtained by a diamond tool bit sintering mould, and the holding force on diamond is enhanced. By adding the metal-structure intensifying alloy elements and rare earth elements, the bending resistance is improved to 1900 Mpa, so that the holding force of the mould on the diamond is finally improved, and the diamond tool bit tool with high cutting performance is obtained.
Description
Technical field
The present invention relates to diamond tool preparing technical field, specifically refer to a kind of diamond tool ultra-fine high-flexural strength alloy powder and preparation method thereof.
Background technology
The cutting mechanism of diamond tool utilizes adamantine hardness cutting hard material, such as stone material, refractory material, pottery, semiconductor, concrete etc.Due in cutting process, diamond is impacted, and plates adamantine part carcass and is destroyed, cause diamond drop-off.Therefore how to strengthen diamond segment carcass to adamantine hold, diamond can not be come off too early in cutting, thus the cutting efficiency of raising diamond tool and working life are the recognized problem in industry.At present, many employing mixed metal powders or water atomization alloy powder are carcass powder raw material, and after mixing with diamond particles, carry out hot pressed sintering, carcass powder raw material holds diamond as binding agent.
The carcass bending strength that diamond tool requires minimumly is greater than 900MPa, otherwise carcass toughness is not enough, easily crackedly in cutting process causes tool failures.Meanwhile, the carcass that bending strength is higher generally acknowledges the fact to better having become in industry of adamantine hold.The multiplex cobalt of early stage Diamond Tool Matrix, as binding agent, is exactly that bending strength can reach more than 1300MPa, and in various metal, cobalt is best to adamantine hold because the combination property of cobalt is fine.But expensive due to cobalt, gradually replace by the compound prescription of the elements such as Fe, Ni, Cu, Sn, in this respect existing a lot of achievement in research and patent open.But weak point has two, the price of first Ni also costly, in order to reduce manufacturing cost, can only reduce the content of Ni; It two is that the sintered body bending strength of this compound prescription is all at 1300-1400MPa, for processing in high-hardness time, often occur that bending strength is not enough, toughness is inadequate, and tyre body abrasion is too fast, not enough to diamond hold, cause the situation that life tools are low, therefore must improve the bending strength of carcass, thus improve the shock-resistant anti-wear performance of carcass, and strengthen adamantine hold.In addition, for different cutting object material, diamond tool producer regulates the component content of cutter head carcass frequently by adding appropriate elemental metals powder.Generally speaking, add elemental powders and can reduce the bending strength of carcass, in order to excessively reduce bending strength, powder based on the alloyed powder needing high-flexural strength, this provides convenient and quality guarantee to regulating the component content of cutter head carcass.
Summary of the invention
The object of the present invention is to provide a kind of diamond tool ultra-fine high-flexural strength alloy powder and preparation method thereof, improve the bending strength of sintering carcass, the final carcass that improves, to adamantine hold, obtains the diamond segment instrument of high cutting ability.
In order to reach above-mentioned purpose, solution of the present invention is:
The ultra-fine high-flexural strength alloy powder of a kind of diamond tool, its chemical composition is composed as follows by weight percentage: Cu:5 ~ 75%, Ni:1 ~ 15%, Sn:1 ~ 15%, Si:1 ~ 5%; Al:1 ~ 15%; Cr:1 ~ 10%; B:0.1 ~ 3%; V:0.1 ~ 3%; Nb:0.1 ~ 2%; Zr:0.1 ~ 4%; La:0.1 ~ 7%; Fe surplus.
The meso-position radius granularity D50 of described alloy powder is 3-15 micron.
Oxygen content≤the 2000ppm of described alloy powder.
A diamond tool preparation method for ultra-fine high-flexural strength alloy powder, its step is as follows:
1) prepare raw material metal, prepare each metal component as follows by weight percentage: Cu:5 ~ 85%, Ni:1 ~ 25%, Sn:1 ~ 20%, Si:0 ~ 8%; Al:1 ~ 15%; Cr:5 ~ 15%; B:0.1 ~ 5%; V:0.1 ~ 6%; Nb:0.1 ~ 5%; Zr:0.1 ~ 5%; La:0.1 ~ 10%; Fe surplus;
2) utilize the raw material metal preparation prepared, 1. smelt successively, 2. water atomization, 3. filter-press dehydration, 4. vacuum drying and 5. reduction step, obtained the present invention's ultra-fine high-flexural strength water atomization alloy powder.
Described 2) in the 1. smelting step of step, need control addition sequence and the joining day node of each raw material metal, be specially, first Fe, Ni, Si, Sn, Cr are put into furnace bottom, power transmission melts; Start to add Cu during about 1/2-2/3 to be melted, finally add V successively in order, Nb, Zr, B, Al and La.
Described 2) in the 1. smelting step of step, smelt and adopt intermediate frequency furnace to smelt, every stove total amount that feeds intake is no more than 220kg, and power controls between 60 ~ 240KW; Furnace lining material is magnesia or quartz sand, and the maximum temperature of fusion process controls at≤1650 DEG C.
Described 2) in the 1. smelting step of step, adopt double deoxidizer silicoglaserite deoxidation and slag making, first by silicoglaserite covering alloy solution top layer, keep melt temperatures to be not less than 1580 DEG C at 5 ~ 15 minutes, then remove the slag of molten surface; Atomization is started when melt temperature is between 1580 ~ 1640 DEG C.
Described 2) the 2. water atomization step of step, it adopts the mode of two groups of nozzle secondary atomizations, and tundish leaks eye diameter 3 ~ 8mm, atomized water flow 80 ~ 140L/min, atomizing pressure 60 ~ 135MPa.
Described 2) the 3. filter-press dehydration step of step is, by the pigment mixture sealing gas supercharging in powder collecting pot after atomization, bottom powder collecting pot, delivery port installs 1200 order filter clothes additional, and under 0.1 ~ 0.5MPa pressure, pressurize is to delivery port is discharged without obvious gas-vapor mix.
Described 2) the 4. vacuum drying step of step is, adopt double conic rotary vacuum dryer, first the wet-milling after dehydration is loaded drier, powder filling port seals, start vavuum pump, start power switch and make the vertical single direction rotation of drier, then start heater switch, vacuum drier setting vacuum is less than-0.09MPa, heating-up temperature 40 ~ 120 DEG C.
Described 2) the 5. reduction step of step is, adopts step-by-step movement to push away boat reduction furnace, and the hydrogen that cracked ammonium produces, the mist reduced powder of nitrogen, reduction temperature is 500 ~ 650 DEG C, and powder is 20 ~ 60 minutes in the reduction furnace isothermal region recovery time.
Described 2) also 6. sieve step in step, sieve according to the screen cloth of corresponding-200 orders of required granularity selection ,-300 orders ,-400 orders or-500 order specifications.
After adopting such scheme, a kind of diamond tool ultra-fine high-flexural strength alloy powder and preparation method thereof of the present invention, advantage is:
1) AL element and Ni form γ '-Ni3AL, and belong to the ordered phase intermetallic compound of L12 type structure, be a kind of face-centred cubic structure, intergranular precipitation, in the tissue of cutter head carcass, enhances the bending strength of carcass; Meanwhile, cutter head produces localized hyperthermia in cutting process, and γ '-Ni3AL can make cutter head keep high temperature toughness.
2) Cr and B element can form stable carbide, Cr
3c
2, BC, sintering the hardening constituent of carcass intra-die and boundary surfaces shape small and dispersed, improves the bending strength of carcass.
3) V, Nb form stable nitride, carbide in sintering carcass, and VC, VN, NbC, NbN can pinning crystal boundaries strongly, and obstruction crystal boundary is grown up, and forms tiny grain structure, thus improves cutter head bending strength.
4) Zr and rare-earth elements La can solid solution in the alloy, play solution strengthening effect; Meanwhile, Zr suitably can improve tyre body hardness, the solid solution that La and Fe is formed, not only bending strength can be improved, can also improve the red hardness of carcass, namely cutter head produces instantaneous high-temperature when being subject to impact friction, and the solid solution of La can keep carcass metal at high temperature to still have higher-strength.
5) alloy powder adopting described process to prepare possesses good low-temperature sintering temperature performance, and within the scope of 760 DEG C ~ 840 DEG C, the relative density of hot pressed sintering carcass block reaches more than 99%, and bending strength is greater than 1900MPa.
To sum up, the present invention can prepare Ultra-fine, the diamond segment of high sintered density, and the Ultra-fine of superfine alloy powder improves beyond the homogeneity of ingredients of single powder, has high sintering activity simultaneously.The low melting point element particularly added promotes micro-liquid-phase sintering, makes diamond segment sinter carcass and obtains higher density, enhance adamantine hold.By adding metal structure reinforced alloys element and rare earth element, the bending strength of Fe-Cu base sintering carcass is brought up to 1900MPa, the final carcass that improves, to adamantine hold, obtains the diamond segment instrument of high cutting ability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of bending strength testing result of the present invention;
Fig. 2 is the schematic diagram of bending strength testing result of the present invention.
Detailed description of the invention
Below in conjunction with detailed description of the invention, this case is described in further detail.
This case relates to the ultra-fine high-flexural strength alloy powder of a kind of diamond tool, and its chemical composition is composed as follows by weight percentage: Cu:5 ~ 75%, Ni:1 ~ 15%, Sn:1 ~ 15%, Si:1 ~ 5%; Al:1 ~ 15%; Cr:1 ~ 10%; B:0.1 ~ 3%; V:0.1 ~ 3%; Nb:0.1 ~ 2%; Zr:0.1 ~ 4%; La:0.1 ~ 7%; Fe surplus.
The meso-position radius granularity D50 of described alloy powder is 3-15 micron.Oxygen content≤the 2000ppm of alloy powder.The thinner powder size limited can activate by acceleration of sintering, and have very high density after sintering, the hypoxemia limited is to improve sintered density equally.
The invention still further relates to the preparation method of a kind of diamond tool with ultra-fine high-flexural strength alloy powder, its step is as follows:
1) prepare raw material metal, prepare each metal component as follows by weight percentage: Cu:5 ~ 85%, Ni:1 ~ 25%, Sn:1 ~ 20%, Si:0 ~ 8%; Al:1 ~ 15%; Cr:5 ~ 15%; B:0.1 ~ 5%; V:0.1 ~ 6%; Nb:0.1 ~ 5%; Zr:0.1 ~ 5%; La:0.1 ~ 10%; Fe surplus;
2) utilize the raw material metal preparation prepared, 1. smelt successively, 2. water atomization, 3. filter-press dehydration, 4. vacuum drying and 5. reduction step, obtained the present invention's ultra-fine high-flexural strength water atomization alloy powder.Below to step 2) in each be described in detail step by step.
1., in smelting step, smelt and adopt intermediate frequency furnace to smelt, every stove total amount that feeds intake is no more than 220kg, and power controls between 60 ~ 240KW (to reach the temperature needed for metal melt); Furnace lining material is that magnesia or quartz sand are (because consider that slag is alkalescence, so select basic lining magnesia or neutral lining quartz sand), the maximum temperature of fusion process controls at≤1650 DEG C that (this temperature controls mainly to take into account lining durability and molten steel flow sex chromosome mosaicism, if temperature is too high can damage lining durability, too low meeting causes molten steel flow deficiency).In atomization process, Control for Kiln Temperature (limits this temperature range at 1580 ~ 1640 DEG C and can ensure that furnace lining is without prejudice, molten steel flow is enough, and be easy to control), power controls 60 ~ 120KW (limit the temperature that this power interval can ensure molten steel, prevent molten steel temperature in atomization process from declining).
1. in smelting step, need control addition sequence and the joining day node of each raw material metal, be specially, first Fe, Ni, Si, Sn, Cr are put into furnace bottom, power transmission melts; Start to add Cu during about 1/2-2/3 to be melted, finally add V successively in order, Nb, Zr, B, Al and La; Limit each raw material metal addition sequence and time point main it is considered that, the metal being not easy to be oxidized adds in melting early stage, and the metal of especially easily oxidation adds later, produces a large amount of slag too early to prevent from adding.
1. in smelting step, adopt double deoxidizer silicoglaserite deoxidation and slag making, first by silicoglaserite covering alloy solution top layer, melt temperature is kept to be not less than 1580 DEG C at 5 ~ 15 minutes, then the slag of molten surface is removed, the restriction of time and temperature, object is beneficial to the deoxidation carrying out molten steel with deoxidier, and form the effect that silico-calcium slag plays poly-slag; Atomization is started when melt temperature is between 1580 ~ 1640 DEG C.
2. water atomization step, it adopts the mode of two groups of nozzle secondary atomizations, and tundish leaks eye diameter 3 ~ 8mm, and atomized water flow 80 ~ 140L/min, atomizing pressure 60 ~ 135MPa, ensure the granularity of atomized powder with this.
3. filter-press dehydration step is, by the pigment mixture sealing gas supercharging in powder collecting pot after atomization, bottom powder collecting pot, delivery port installs 1200 order filter clothes additional, and under 0.1 ~ 0.5MPa pressure, pressurize is to delivery port is discharged without obvious gas-vapor mix.Because powder is comparatively thin, herein must with the filter cloth of high order number, the enough press filtrations of pressure of 0.5MPa.
4. vacuum drying step is, adopt double conic rotary vacuum dryer, first the wet-milling after dehydration is loaded drier, powder filling port seals, and starts vavuum pump, starts power switch and makes the vertical single direction rotation of drier, then heater switch is started, vacuum drier setting vacuum is less than-0.09MPa, guarantees enough vacuum, prevents Powder Oxidation; Heating-up temperature 40 ~ 120 DEG C, allows water rapid evaporation with this.
5. reduction step is, adopts step-by-step movement to push away boat reduction furnace, and the hydrogen that cracked ammonium produces, the mist reduced powder of nitrogen, reduction temperature is 500 ~ 650 DEG C, and powder is 20 ~ 60 minutes in the reduction furnace isothermal region recovery time.The reduction temperature limited can guarantee deoxidation under the non-caking state of powder, can enough deoxidations in 60 minutes.
Described 2) finally also 6. can sieve in step, 7. close and criticize and 8. vacuum packaging step.6. sieve step, sieve according to the screen cloth of corresponding-200 orders of required granularity selection ,-300 orders ,-400 orders or-500 order specifications.7. close batch step, the screenings after screening is concentrated, add the mixing of vacuum mixing machine, make it even particle size distribution.8. vacuum packaging step, adopting plastic vacuum packaging bag vacuum packaging by closing the powder after criticizing, can select every bag of packed weight as required.
Specific embodiment 1
The alloy powder that the present invention makes, is according to through Composition Design formula, raw material is carried out high melt, hydraulic atomized, through vacuum drying and hydrogen deoxidation, obtains product powder after sieving.Product powder hot-pressing is become standard bending strength coupon, carries out three-point bending resistance strength test with bending strength test machine.
Use raw metal and weight as following table:
| Raw material | Fe | Ni | Cu | Si | Sn | Cr | AL | La | V | Nb | Zr | B | Gross weight, kg |
| Weight | 119.3 | 8.8 | 44.0 | 6.6 | 8.8 | 11.0 | 15.4 | 0.25 | 1.65 | 1.32 | 0.24 | 2.64 | 220 |
Use the Medium frequency induction smelting furnace of industrial production 250kg heat size, furnace lining material is magnesia, first Fe, Ni, Si, Sn, Cr is put into furnace bottom, and power transmission melts.Start to add Cu when melting about 1/2-2/3, finally add V successively in order, Nb, Zr, B, Al and La.After melting sources, with the deoxidation of double deoxidizer silicoglaserite and slag making, first by silicoglaserite covering alloy solution top layer, melt temperatures are kept to be not less than 1580 DEG C at 5 ~ 15 minutes; Then remove the slag of molten surface, start atomization when melt temperature is between 1580 ~ 1640 DEG C.Adjustment atomizing pressure is 120MPa.Pigment mixture after atomization is through Compressed Gas press filtration; Wet-milling after dehydration is loaded drier and carries out vacuum drying.Powder after drying is loaded reduction furnace, hydrogen reducing 30 minutes at 600 DEG C.Reduced powder is carried out screening with 400 eye mesh screens and obtains final products powder.
Testing result is as follows:
Bending strength testing result is shown in Figure 1.
Specific embodiment 2
Compared with embodiment 1, embodiment 2 have adjusted raw material addition.
| Raw material | Fe | Ni | Cu | Si | Sn | Cr | AL | La | V | Nb | Zr | B | Gross weight, kg |
| Weight | 77.2 | 22.0 | 66.0 | 6.6 | 4.4 | 22.0 | 11.0 | 0.5 | 2.5 | 2.64 | 0.24 | 4.92 | 220 |
Raw material ordering in launching is identical with embodiment 1 with smelting mode.Adjustment atomizing pressure is 135MPa.Pigment mixture after atomization is through Compressed Gas press filtration.Wet-milling after dehydration is loaded drier and carries out vacuum drying.Powder after drying is loaded reduction furnace, hydrogen reducing 30 minutes at 550 DEG C.Reduced powder is carried out screening with 500 eye mesh screens and obtains final products powder.
Final products powder testing result is as follows:
Bending strength testing result is shown in Figure 2.
The foregoing is only the preferred embodiments of the present invention, all equalizations done with the claims in the present invention scope change and modify, and all should belong to the scope of the claims in the present invention.
Claims (10)
1. the ultra-fine high-flexural strength alloy powder of diamond tool, it is characterized in that, its chemical composition is composed as follows by weight percentage: Cu:5 ~ 75%, Ni:1 ~ 15%, Sn:1 ~ 15%, Si:1 ~ 5%; Al:1 ~ 15%; Cr:1 ~ 10%; B:0.1 ~ 3%; V:0.1 ~ 3%; Nb:0.1 ~ 2%; Zr:0.1 ~ 4%; La:0.1 ~ 7%; Fe surplus.
2. the ultra-fine high-flexural strength alloy powder of a kind of diamond tool as claimed in claim 1, is characterized in that, the meso-position radius granularity D50 of described alloy powder is 3-15 micron.
3. the ultra-fine high-flexural strength alloy powder of a kind of diamond tool as claimed in claim 1, is characterized in that, the oxygen content≤2000ppm of described alloy powder.
4. a diamond tool preparation method for ultra-fine high-flexural strength alloy powder, it is characterized in that, step is as follows:
1) prepare raw material metal, prepare each metal component as follows by weight percentage: Cu:5 ~ 85%, Ni:1 ~ 25%, Sn:1 ~ 20%, Si:0 ~ 8%; Al:1 ~ 15%; Cr:5 ~ 15%; B:0.1 ~ 5%; V:0.1 ~ 6%; Nb:0.1 ~ 5%; Zr:0.1 ~ 5%; La:0.1 ~ 10%; Fe surplus;
2) utilize the raw material metal preparation prepared, 1. smelt successively, 2. water atomization, 3. filter-press dehydration, 4. vacuum drying and 5. reduction step, obtained the present invention's ultra-fine high-flexural strength water atomization alloy powder.
5. a kind of diamond tool as claimed in claim 4 preparation method of ultra-fine high-flexural strength alloy powder, it is characterized in that, described 2), in the 1. smelting step of step, addition sequence and the joining day node of each raw material metal need be controlled, be specially, first by Fe, Ni, Si, Sn, Cr puts into furnace bottom, and power transmission melts; Start to add Cu during about 1/2-2/3 to be melted, finally add V successively in order, Nb, Zr, B, Al and La.
6. the preparation method of ultra-fine high-flexural strength alloy powder of a kind of diamond tool as described in claim 4 or 5, it is characterized in that, described 2) in the 1. smelting step of step, smelt and adopt intermediate frequency furnace to smelt, every stove total amount that feeds intake is no more than 220kg, and power controls between 60 ~ 240KW; Furnace lining material is magnesia or quartz sand, and the maximum temperature of fusion process controls at≤1650 DEG C.
7. the preparation method of ultra-fine high-flexural strength alloy powder of a kind of diamond tool as described in claim 4 or 5, it is characterized in that, described 2) in the 1. smelting step of step, adopt double deoxidizer silicoglaserite deoxidation and slag making, first by silicoglaserite covering alloy solution top layer, keep melt temperature to be not less than 1580 DEG C at 5 ~ 15 minutes, then remove the slag of molten surface; Atomization is started when melt temperature is between 1580 ~ 1640 DEG C.
8. a kind of diamond tool as claimed in claim 4 preparation method of ultra-fine high-flexural strength alloy powder, it is characterized in that, described 2) the 2. water atomization step of step, it adopts the mode of two groups of nozzle secondary atomizations, tundish leaks eye diameter 3 ~ 8mm, atomized water flow 80 ~ 140L/min, atomizing pressure 60 ~ 135MPa.
9. a kind of diamond tool as claimed in claim 4 preparation method of ultra-fine high-flexural strength alloy powder, it is characterized in that, described 2) the 3. filter-press dehydration step of step is, by the pigment mixture sealing gas supercharging in powder collecting pot after atomization, bottom powder collecting pot, delivery port installs 1200 order filter clothes additional, and under 0.1 ~ 0.5MPa pressure, pressurize is to delivery port is discharged without obvious gas-vapor mix.
10. a kind of diamond tool as claimed in claim 4 preparation method of ultra-fine high-flexural strength alloy powder, it is characterized in that, described 2) the 5. reduction step of step is, step-by-step movement is adopted to push away boat reduction furnace, the hydrogen that cracked ammonium produces, the mist reduced powder of nitrogen, reduction temperature is 500 ~ 650 DEG C, and powder is 20 ~ 60 minutes in the reduction furnace isothermal region recovery time.
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| CN105834417B (en) | 2018-04-13 |
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