CN102634683A - Sintering technology for high-specific gravity tungsten alloy - Google Patents
Sintering technology for high-specific gravity tungsten alloy Download PDFInfo
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Abstract
The invention discloses a sintering technology for a high-specific gravity tungsten alloy, which comprises the following steps of: 1) preparing materials according to a nominal composition of the high-specific gravity tungsten alloy, mixing materials according to a conventional method, and then pressing, thereby obtaining an alloy pressed blank; 2) primarily sintering the alloy pressed blank and cooling in furnace, thereby obtaining a pre-sintered blank; and 3) secondarily sintering the pre-sintered blank and cooling in furnace, thereby obtaining an alloy. According to the sintering technology for the high-specific gravity tungsten alloy, twice sintering is adopted, deformation of materials in the sintering process is reduced and the use ratio of raw materials is increased, so that the production cost of the products is lowered. By adopting the temperature of the twice sintering according to the sintering technology provided by the invention, the volume of sintering liquid phase in the tungsten alloy material is effectively controlled, the viscosity of a sintered body is increased, the mobility of the sintered body is reduced, and the sintering blank at high temperature has the capability of maintaining the shape of the original pressed blank and avoiding serious deformation.
Description
Technical field
The invention belongs to powder metallurgical technology, be specifically related to a kind of sintering process of high-specific gravity tungsten alloy.
Background technology
90WNiFe alloy and 93WNiFe alloy belong to low W content high-specific gravity tungsten alloy; The sintering process of existing high-specific gravity tungsten alloy generally adopts once sintered; The product scrap rate that sintering obtains is high, and raw material availability is low, makes the production cost of high-specific gravity tungsten alloy can not be in any more always.With the 90WNiFe alloy of tungstenic amount 90wt% and the 93WNiFe alloy of tungstenic amount 93% is example; Adopt existing technology agglomerating 90WNiFe alloy materials utilization ratio to be merely 60%; Adopt existing technology agglomerating 93WNiFe alloy materials utilization ratio to be merely 63%, wastage of material is serious.
Summary of the invention
Technical problem to be solved by this invention is the deficiency to above-mentioned prior art, and a kind of sintering process of high-specific gravity tungsten alloy is provided.Twice sintering of this process using; Reduce the sintering warpage amount, improved utilization ratio of raw materials, thereby reduced production cost of products; Adopt the alloy of sintering process preparation of the present invention; Scrap rate is extremely low, and raw material availability is greatly improved, and the alloy of preparation meets relevant standard of materials requirement.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of sintering process of high-specific gravity tungsten alloy is characterized in that this technology may further comprise the steps:
Step 1, according to the nominal composition of high-specific gravity tungsten alloy 90WNiFe alloy batching, die mould obtains 90WNiFe alloy pressed compact behind conventional method batch mixing;
Step 2, the alloy of 90WNiFe described in step 1 pressed compact being sent in the retort furnace, is 1400 ℃～1420 ℃ in sintering temperature, pushes away to carry out once sinteredly under the condition that boat speed is 7mm/s～10mm/s, and furnace cooling obtains the presintering base then; Perhaps the alloy of 90WNiFe described in step 1 pressed compact being placed the Medium frequency induction sintering oven, is 1400 ℃～1420 ℃ in sintering temperature, and soaking time is to carry out once sinteredly under the condition of 30min～50min, and furnace cooling obtains the presintering base then;
Step 3, the base of presintering described in the step 2 being sent in the retort furnace, is 1410 ℃～1430 ℃ in sintering temperature, pushes away under the condition that boat speed is 7mm/s～10mm/s and carries out double sintering, obtains the 90WNiFe alloy behind the furnace cooling; Perhaps the base of presintering described in the step 2 being placed the Medium frequency induction sintering oven, is 1410 ℃～1430 ℃ in sintering temperature, and soaking time is to carry out double sintering under the condition of 30min～50min, obtains the 90WNiFe alloy behind the furnace cooling.
The sintering process of above-mentioned a kind of high-specific gravity tungsten alloy all adopts decomposed ammonia as shielding gas in once sintered process described in the step 2 and the furnace cooling process.
The sintering process of above-mentioned a kind of high-specific gravity tungsten alloy all adopts decomposed ammonia or hydrogen as shielding gas in process of double sintering described in the step 3 and the furnace cooling process.
The sintering process of another kind of high-specific gravity tungsten alloy of the present invention is characterized in that, this technology may further comprise the steps:
Step 1, according to the nominal composition of high-specific gravity tungsten alloy 93WNiFe alloy batching, die mould obtains 93WNiFe alloy pressed compact behind conventional method batch mixing;
Step 2, the alloy of 93WNiFe described in step 1 pressed compact being sent in the retort furnace, is 1400 ℃～1450 ℃ in sintering temperature, pushes away to carry out once sinteredly under the condition that boat speed is 7mm/s～10mm/s, and furnace cooling obtains the presintering base then; Perhaps the alloy of 93WNiFe described in step 1 pressed compact being placed the Medium frequency induction sintering oven, is 1400 ℃～1450 ℃ in sintering temperature, and soaking time is to carry out once sinteredly under the condition of 30min～50min, and furnace cooling obtains the presintering base then;
Step 3, the base of presintering described in the step 2 being sent in the retort furnace, is 1440 ℃～1480 ℃ in sintering temperature, pushes away under the condition that boat speed is 7mm/s～10mm/s and carries out double sintering, obtains the 93WNiFe alloy behind the furnace cooling; Perhaps the base of presintering described in the step 2 being placed the Medium frequency induction sintering oven, is 1440 ℃～1480 ℃ in sintering temperature, and soaking time is to carry out double sintering under the condition of 30min～50min, obtains the 93WNiFe alloy behind the furnace cooling.
The sintering process of above-mentioned a kind of high-specific gravity tungsten alloy all adopts decomposed ammonia as shielding gas in once sintered process described in the step 2 and the furnace cooling process.
The sintering process of above-mentioned a kind of high-specific gravity tungsten alloy all adopts decomposed ammonia or hydrogen as shielding gas in process of double sintering described in the step 3 and the furnace cooling process.
The present invention compared with prior art has the following advantages:
1, is higher than normal powder sintered required activation energy owing to destroy the required activation energy of W skeleton formation particle rearrangement; Therefore the present invention once sintered through lesser temps earlier forms the alloy pressed compact and has the W skeleton of certain geometric shape, and the Van der Waals force between the powder particle become have certain intensity metal bonding force; Carry out double sintering then; Because double sintering temperature and once sintered temperature deviation are not very big, W skeleton is difficult to destroy in the double sintering process, thereby makes tungstenalloy keep the shape of original pressed compact; Guarantee the deflection of product, reach the purpose that reduces sintering warpage.
2, adopt twice agglomerating temperature of the present invention, can effectively control the sintering amount of liquid phase in the tungsten alloy material, increase sintered compact viscosity, it is mobile to reduce sintered compact, makes that sintered blank has the ability that keeps former pressed compact shape under the high temperature, and moderate finite deformation does not take place.
3, the present invention adopts sintering twice, has reduced the deflection of material in sintering process, has improved utilization ratio of raw materials, thereby has reduced production cost of products.
4, adopt the high-specific gravity tungsten alloy scrap rate extremely low (less than 1%) of sintering process preparation of the present invention, raw material availability is greatly improved, and the high-specific gravity tungsten alloy of preparation meets GJB1074, MIL-T-21014, relevant industries standards such as B777.
5, adopt sintering process of the present invention to produce 2 tons of 90WNiFe alloy products, the sintering warpage amount is reduced to below 17% from 23% of existing common process, and material use efficiency is increased to more than 73% by 60% of existing common process.Compare with existing normal sintering technology, more than the conservation 400kg, practice thrift cost more than 50,000 yuan; Adopt sintering process of the present invention to produce 2 tons of 93WNiFe alloy products, the sintering warpage amount is reduced to below 14% from 20% of existing common process, and material use efficiency is increased to more than 75% by 63% of existing common process.Compare with existing normal sintering technology, more than the conservation 300kg, practice thrift cost more than 40,000 yuan.
Through embodiment, technical scheme of the present invention is done further detailed description below.
Embodiment
Embodiment 1
Step 1, according to name (90W-7Ni-3Fe) ingredient composition of high-specific gravity tungsten alloy 90WNiFe alloy, die mould obtains 90WNiFe alloy pressed compact behind conventional method batch mixing;
Step 2, the alloy of 90WNiFe described in step 1 pressed compact is sent in the retort furnace; Under decomposed ammonia protection, sintering temperature is 1400 ℃, push away carry out under the condition that boat speed is 7mm/s once sintered; Furnace cooling under the decomposed ammonia protection obtains the presintering base then;
Step 3, the base of presintering described in the step 2 is sent in the retort furnace, in the decomposed ammonia protection down, sintering temperature is 1410 ℃, pushes away under the condition that boat speed is 7mm/s to carry out double sintering, and furnace cooling under decomposed ammonia is protected obtains the 90WNiFe alloy then.
Adopt the sintering process of present embodiment to produce 2 tons of 90WNiFe alloy products, the sintering warpage amount is reduced to 14% from 23% of existing common process, and material use efficiency is increased to 75% by 60% of existing common process.Compare with existing normal sintering technology, conservation 500kg practices thrift cost more than 60,000 yuan.
Embodiment 2
Present embodiment is identical with embodiment 1, and wherein difference is: said once sintered sintering temperature is 1420 ℃, and the once sintered boat speed that pushes away is 10mm/s; The sintering temperature of said double sintering is 1430 ℃, and the boat speed that pushes away of double sintering is 10mm/s.
Adopt the sintering process of present embodiment to produce 2 tons of 90WNiFe alloy products, the sintering warpage amount is reduced to 14% from 23% of existing common process, and material use efficiency is increased to 75% by 60% of existing common process.Compare with existing normal sintering technology, conservation 500kg practices thrift cost more than 60,000 yuan.
Embodiment 3
Present embodiment is identical with embodiment 1, and wherein difference is: said once sintered sintering temperature is 1410 ℃, and the once sintered boat speed that pushes away is 8mm/s; The sintering temperature of said double sintering is 1420 ℃, and the boat speed that pushes away of double sintering is 8mm/s.
Adopt the sintering process of present embodiment to produce 2 tons of 90WNiFe alloy products, the sintering warpage amount is reduced to 14% from 23% of existing common process, and material use efficiency is increased to 75% by 60% of existing common process.Compare with existing normal sintering technology, conservation 500kg practices thrift cost more than 60,000 yuan.
Embodiment 4
Step 1, according to the nominal composition (90W-7Ni-3Fe) of high-specific gravity tungsten alloy 90WNiFe alloy batching, die mould obtains 90WNiFe alloy pressed compact behind conventional method batch mixing;
Step 2, the alloy of 90WNiFe described in step 1 pressed compact is placed the Medium frequency induction sintering oven; Under the decomposed ammonia protection; Sintering temperature is that insulation 40min carries out once sinteredly under 1410 ℃ the condition, and furnace cooling under the decomposed ammonia protection obtains the presintering base then;
Step 3, the base of presintering described in the step 2 is placed medium-frequency induction furnace, under hydrogen shield, sintering temperature is that insulation 40min carries out double sintering under 1420 ℃ the condition, and furnace cooling under hydrogen shield obtains the 90WNiFe alloy then.
Adopt the sintering process of present embodiment to produce 2 tons of 90WNiFe alloy products, the sintering warpage amount is reduced to 17% from 23% of existing common process, and material use efficiency is increased to 73% by 60% of existing common process.Compare with existing normal sintering technology, conservation 400kg practices thrift cost more than 50,000 yuan.
Embodiment 5
Present embodiment is identical with embodiment 4, and wherein difference is: said once sintered sintering temperature is 1400 ℃, and once sintered soaking time is 50min; The sintering temperature of said double sintering is 1410 ℃, and the soaking time of double sintering is 50min.
Adopt the sintering process of present embodiment to produce 2 tons of 90WNiFe alloy products, the sintering warpage amount is reduced to 17% from 23% of existing common process, and material use efficiency is increased to 73% by 60% of existing common process.Compare with existing normal sintering technology, conservation 400kg practices thrift cost more than 50,000 yuan.
Embodiment 6
Present embodiment is identical with embodiment 4, and wherein difference is: said once sintered sintering temperature is 1420 ℃, and once sintered soaking time is 30min; The sintering temperature of said double sintering is 1430 ℃, and the soaking time of double sintering is 30min.
Adopt the sintering process of present embodiment to produce 2 tons of 90WNiFe alloy products, the sintering warpage amount is reduced to 17% from 23% of existing common process, and material use efficiency is increased to 73% by 60% of existing common process.Compare with existing normal sintering technology, conservation 400kg practices thrift cost more than 50,000 yuan.
Embodiment 7
Step 1, according to the nominal composition (90W-7Ni-3Fe) of high-specific gravity tungsten alloy 90WNiFe alloy batching, die mould obtains 90WNiFe alloy pressed compact behind conventional method batch mixing;
Step 2, the alloy of 90WNiFe described in step 1 pressed compact being sent in the retort furnace, is 1420 ℃ in sintering temperature, pushes away to carry out once sinteredly under the condition that boat speed is 10mm/s, and furnace cooling obtains the presintering base then;
Step 3, the base of presintering described in the step 2 being placed the Medium frequency induction sintering oven, is that insulation 40min carries out double sintering under 1430 ℃ the condition in sintering temperature, and furnace cooling obtains the 90WNiFe alloy then.
Adopt the sintering process of present embodiment to produce 2 tons of 90WNiFe alloy products, the sintering warpage amount is reduced to 14% from 23% of existing common process, and material use efficiency is increased to 75% by 60% of existing common process.Compare with existing normal sintering technology, conservation 400kg practices thrift cost more than 50,000 yuan.
Embodiment 8
Present embodiment is identical with embodiment 7, and wherein difference is: said once sintered sintering temperature is 1400 ℃, and the once sintered boat speed that pushes away is 8mm/s; The sintering temperature of said double sintering is 1420 ℃, and the soaking time of double sintering is 30min.
Adopt the sintering process of present embodiment to produce 2 tons of 90WNiFe alloy products, the sintering warpage amount is reduced to 14% from 23% of existing common process, and material use efficiency is increased to 75% by 60% of existing common process.Compare with existing normal sintering technology, conservation 400kg practices thrift cost more than 50,000 yuan.
Embodiment 9
Present embodiment is identical with embodiment 7, and wherein difference is: said once sintered sintering temperature is 1410 ℃, and the once sintered boat speed that pushes away is 7mm/s; The sintering temperature of said double sintering is 1410 ℃, and the soaking time of double sintering is 50min.
Adopt the sintering process of present embodiment to produce 2 tons of 90WNiFe alloy products, the sintering warpage amount is reduced to 14% from 23% of existing common process, and material use efficiency is increased to 75% by 60% of existing common process.Compare with existing normal sintering technology, conservation 400kg practices thrift cost more than 50,000 yuan.
Embodiment 10
Step 1, according to the nominal composition (93W-4.9Ni-2.1Fe) of high-specific gravity tungsten alloy 93WNiFe alloy batching, die mould obtains 93WNiFe alloy pressed compact behind conventional method batch mixing;
Step 2, the alloy of 93WNiFe described in step 1 pressed compact being placed the Medium frequency induction sintering oven, is that insulation 50min carries out once sinteredly under 1400 ℃ the condition in sintering temperature, and furnace cooling obtains the presintering base then;
Step 3, the base of presintering described in the step 2 being sent in the retort furnace, is 1440 ℃ in sintering temperature, pushes away under the condition that boat speed is 7mm/s and carries out double sintering, and furnace cooling obtains the 93WNiFe alloy then.
Adopt the sintering process of present embodiment to produce 2 tons of 93WNiFe alloy products, the sintering warpage amount is reduced to 13% from 20% of existing common process, and material use efficiency is increased to 78% by 63% of existing common process.Compare with existing normal sintering technology, conservation 500kg practices thrift cost more than 50,000 yuan.
Embodiment 11
Present embodiment is identical with embodiment 10, and wherein difference is: said once sintered sintering temperature is 1450 ℃, and soaking time is 30min; The sintering temperature of said double sintering is 1480 ℃, and pushing away boat speed is 10mm/s.
Adopt the sintering process of present embodiment to produce 2 tons of 93WNiFe alloy products, the sintering warpage amount is reduced to 13% from 20% of existing common process, and material use efficiency is increased to 78% by 63% of existing common process.Compare with existing normal sintering technology, conservation 500kg practices thrift cost more than 50,000 yuan.
Embodiment 12
Present embodiment is identical with embodiment 10, and wherein difference is: said once sintered sintering temperature is 1430 ℃, and soaking time is 40min; The sintering temperature of said double sintering is 1460 ℃, and pushing away boat speed is 9mm/s.
Adopt the sintering process of present embodiment to produce 2 tons of 93WNiFe alloy products, the sintering warpage amount is reduced to 13% from 20% of existing common process, and material use efficiency is increased to 78% by 63% of existing common process.Compare with existing normal sintering technology, conservation 500kg practices thrift cost more than 50,000 yuan.
Embodiment 13
Step 1, according to the nominal composition (93W-4.9Ni-2.1Fe) of high-specific gravity tungsten alloy 93WNiFe alloy batching, die mould obtains 93WNiFe alloy pressed compact behind conventional method batch mixing;
Step 2, the alloy of 93WNiFe described in step 1 pressed compact is sent in the retort furnace; Under decomposed ammonia protection, sintering temperature is 1450 ℃, push away carry out under the condition that boat speed is 10mm/s once sintered; Furnace cooling under the decomposed ammonia protection obtains the presintering base then;
Step 3, the base of presintering described in the step 2 is sent in the retort furnace, under hydrogen shield, sintering temperature is 1480 ℃, pushes away under the condition that boat speed is 10mm/s to carry out double sintering, and furnace cooling under hydrogen shield obtains the 93WNiFe alloy then.
Adopt the sintering process of present embodiment to produce 2 tons of 93WNiFe alloy products, the sintering warpage amount is reduced to 14% from 20% of existing common process, and material use efficiency is increased to 75% by 63% of existing common process.Compare with existing normal sintering technology, conservation 300kg practices thrift cost more than 40,000 yuan.
Embodiment 14
Present embodiment is identical with embodiment 13, and wherein difference is: said once sintered sintering temperature is 1440 ℃, and pushing away boat speed is 9mm/s; The sintering temperature of said double sintering is 1450 ℃, and pushing away boat speed is 8mm/s.
Adopt the sintering process of present embodiment to produce 2 tons of 93WNiFe alloy products, the sintering warpage amount is reduced to 14% from 20% of existing common process, and material use efficiency is increased to 75% by 63% of existing common process.Compare with existing normal sintering technology, conservation 300kg practices thrift cost more than 40,000 yuan.
Embodiment 15
Present embodiment is identical with embodiment 13, and wherein difference is: said once sintered sintering temperature is 1400 ℃, and pushing away boat speed is 7mm/s; The sintering temperature of said double sintering is 1440 ℃, and pushing away boat speed is 7mm/s.
Adopt the sintering process of present embodiment to produce 2 tons of 93WNiFe alloy products, the sintering warpage amount is reduced to 14% from 20% of existing common process, and material use efficiency is increased to 75% by 63% of existing common process.Compare with existing normal sintering technology, conservation 300kg practices thrift cost more than 40,000 yuan.
Embodiment 16
Step 1, according to the nominal composition (93W-4.9Ni-2.1Fe) of high-specific gravity tungsten alloy 93WNiFe alloy batching, die mould obtains 93WNiFe alloy pressed compact behind conventional method batch mixing;
Step 2, the alloy of 93WNiFe described in step 1 pressed compact is placed the Medium frequency induction sintering oven; Under the decomposed ammonia protection; Sintering temperature is that insulation 45min carries out once sinteredly under 1420 ℃ the condition, and furnace cooling under the decomposed ammonia protection obtains the presintering base then;
Step 3, the base of presintering described in the step 2 is placed the Medium frequency induction sintering oven; Under the decomposed ammonia protection; Sintering temperature is that insulation 35min carries out double sintering under 1450 ℃ the condition, and furnace cooling under the decomposed ammonia protection obtains the 93WNiFe alloy then.
Adopt the sintering process of present embodiment to produce 2 tons of 93WNiFe alloy products, the sintering warpage amount is reduced to 14% from 20% of existing common process, and material use efficiency is increased to 75% by 63% of existing common process.Compare with existing normal sintering technology, conservation 300kg practices thrift cost more than 50,000 yuan.
Embodiment 17
Present embodiment is identical with embodiment 16, and wherein difference is: said once sintered sintering temperature is 1400 ℃, and soaking time is 50min; The sintering temperature of said double sintering is 1440 ℃, and soaking time is 50min.
Adopt the sintering process of present embodiment to produce 2 tons of 93WNiFe alloy products, the sintering warpage amount is reduced to 14% from 20% of existing common process, and material use efficiency is increased to 75% by 63% of existing common process.Compare with existing normal sintering technology, conservation 300kg practices thrift cost more than 50,000 yuan.
Embodiment 18
Present embodiment is identical with embodiment 16, and wherein difference is: said once sintered sintering temperature is 1450 ℃, and soaking time is 30min; The sintering temperature of said double sintering is 1480 ℃, and soaking time is 30min.
Adopt the sintering process of present embodiment to produce 2 tons of 93WNiFe alloy products, the sintering warpage amount is reduced to 14% from 20% of existing common process, and material use efficiency is increased to 75% by 63% of existing common process.Compare with existing normal sintering technology, conservation 300kg practices thrift cost more than 50,000 yuan.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any restriction, every technical spirit changes any simple modification, change and the equivalent structure that above embodiment did according to the present invention, all still belongs in the protection domain of technical scheme of the present invention.
Claims (6)
1. the sintering process of a high-specific gravity tungsten alloy is characterized in that, this technology may further comprise the steps:
Step 1, according to the nominal composition of high-specific gravity tungsten alloy 90WNiFe alloy batching, die mould obtains 90WNiFe alloy pressed compact behind conventional method batch mixing;
Step 2, the alloy of 90WNiFe described in step 1 pressed compact being sent in the retort furnace, is 1400 ℃～1420 ℃ in sintering temperature, pushes away to carry out once sinteredly under the condition that boat speed is 7mm/s～10mm/s, and furnace cooling obtains the presintering base then; Perhaps the alloy of 90WNiFe described in step 1 pressed compact being placed the Medium frequency induction sintering oven, is 1400 ℃～1420 ℃ in sintering temperature, and soaking time is to carry out once sinteredly under the condition of 30min～50min, and furnace cooling obtains the presintering base then;
Step 3, the base of presintering described in the step 2 being sent in the retort furnace, is 1410 ℃～1430 ℃ in sintering temperature, pushes away under the condition that boat speed is 7mm/s～10mm/s and carries out double sintering, obtains the 90WNiFe alloy behind the furnace cooling; Perhaps the base of presintering described in the step 2 being placed the Medium frequency induction sintering oven, is 1410 ℃～1430 ℃ in sintering temperature, and soaking time is to carry out double sintering under the condition of 30min～50min, obtains the 90WNiFe alloy behind the furnace cooling.
2. the sintering process of a kind of high-specific gravity tungsten alloy according to claim 1 is characterized in that, all adopts decomposed ammonia as shielding gas in once sintered process described in the step 2 and the furnace cooling process.
3. the sintering process of a kind of high-specific gravity tungsten alloy according to claim 1 is characterized in that, all adopts decomposed ammonia or hydrogen as shielding gas in process of double sintering described in the step 3 and the furnace cooling process.
4. the sintering process of a high-specific gravity tungsten alloy is characterized in that, this technology may further comprise the steps:
Step 1, according to the nominal composition of high-specific gravity tungsten alloy 93WNiFe alloy batching, die mould obtains 93WNiFe alloy pressed compact behind conventional method batch mixing;
Step 2, the alloy of 93WNiFe described in step 1 pressed compact being sent in the retort furnace, is 1400 ℃～1450 ℃ in sintering temperature, pushes away to carry out once sinteredly under the condition that boat speed is 7mm/s～10mm/s, and furnace cooling obtains the presintering base then; Perhaps the alloy of 93WNiFe described in step 1 pressed compact being placed the Medium frequency induction sintering oven, is 1400 ℃～1450 ℃ in sintering temperature, and soaking time is to carry out once sinteredly under the condition of 30min～50min, and furnace cooling obtains the presintering base then;
Step 3, the base of presintering described in the step 2 being sent in the retort furnace, is 1440 ℃～1480 ℃ in sintering temperature, pushes away under the condition that boat speed is 7mm/s～10mm/s and carries out double sintering, obtains the 93WNiFe alloy behind the furnace cooling; Perhaps the base of presintering described in the step 2 being placed the Medium frequency induction sintering oven, is 1440 ℃～1480 ℃ in sintering temperature, and soaking time is to carry out double sintering under the condition of 30min～50min, obtains the 93WNiFe alloy behind the furnace cooling.
5. the sintering process of a kind of high-specific gravity tungsten alloy according to claim 4 is characterized in that, all adopts decomposed ammonia as shielding gas in once sintered process described in the step 2 and the furnace cooling process.
6. the sintering process of a kind of high-specific gravity tungsten alloy according to claim 4 is characterized in that, all adopts decomposed ammonia or hydrogen as shielding gas in process of double sintering described in the step 3 and the furnace cooling process.
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| CN106148745A (en) * | 2015-04-14 | 2016-11-23 | 上海六晶科技股份有限公司 | Use the method that zone sintering method prepares tungsten nickel iron alloy |
| CN106148745B (en) * | 2015-04-14 | 2018-06-12 | 上海六晶科技股份有限公司 | The method that tungsten nickel iron alloy is prepared using zone sintering method |
| CN107309430A (en) * | 2017-08-10 | 2017-11-03 | 攀枝花学院 | A kind of large parts metal powder injection molding method |
| CN109950015A (en) * | 2019-04-23 | 2019-06-28 | 惠州市福益乐永磁科技有限公司 | The sintering method of cylindrical sintered NdFeB |
| CN113462942A (en) * | 2021-07-02 | 2021-10-01 | 西安华力装备科技有限公司 | Preparation method of high-yield tungsten alloy material |
| CN114107714A (en) * | 2021-11-26 | 2022-03-01 | 西安华山钨制品有限公司 | Production process for improving mechanical property of tungsten-nickel-copper alloy |
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