CN104588640A - High-hardness ferrum-based powder metallurgy material for valve and preparing method thereof - Google Patents
High-hardness ferrum-based powder metallurgy material for valve and preparing method thereof Download PDFInfo
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- CN104588640A CN104588640A CN201410819016.5A CN201410819016A CN104588640A CN 104588640 A CN104588640 A CN 104588640A CN 201410819016 A CN201410819016 A CN 201410819016A CN 104588640 A CN104588640 A CN 104588640A
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Abstract
The invention discloses a high-hardness ferrum-based powder metallurgy material for a valve. The high-hardness ferrum-based powder metallurgy material for the valve comprises, by weight, 0.6-0.9 part of colloidal graphite, 0.2-0.4 part of carbon powder, 5-7 parts of molybdenum dioxide, 1.2-1.5 parts of nanometer rare earth oxide, 7-9 parts of black silicon carbide, 1-2 parts of lithium, 0.5-0.9 part of sodium borohydride, 2-4 parts of calcium silicon powder, 5-6 parts of copper, 4-6 parts of zinc, 1.2-1.5 parts of silica fume, 0.6-0.8 part of silane coupling agent kh-550, a proper amount of 1% sodium carbonate solution, a proper amount of water, 2.5-3.5 parts of sodium hypophosphite, 0.4-0.6 part of polyethylene glycol, 30-35 parts of 2Mol/L copper sulphate solution, 2-3 parts of wetting assistant, and 60-64 parts of iron powder. The high-hardness ferrum-based powder metallurgy material for the valve has the advantages of being fully compact, high in hardness, high in indoor-temperature bending strength and excellent in high-temperature mechanical property, the performance cost ratio is high, and the industrial production prospect is good.
Description
Technical field
The present invention relates to powder metallurgical technology, particularly relate to a kind of valve high rigidity iron-base powder metallurgy material and preparation method thereof.
Background technology
Valve is in fluid system, is used for controlling the device of the direction of fluid, pressure, flow, is the medium in pipe arrangement and equipment (liquid, gas, powder) is flowed or stops and controlling the device of its flow.
Valve material therefor is a lot, and wherein powdered metallurgical material manufacture craft is simple, makes precision high, saved cost, but powder metallurgy exists a lot of problem.Such as common iron-base powder metallurgy material is heat-resisting, corrosion resistance is poor, and bearing is poor, and the mechanical properties such as intensity, hardness, resistance to impact are not high enough.
Metal has thermal shock resistance, the feature of good toughness, but metal is easily oxidized, and elevated temperature strength is not high.Ceramic material has high rigidity, good heat resistance, the feature such as corrosion-resistant.By metal and Ceramic bond, can obtain that hardness is large, elevated temperature strength is high, high temperature creep is good, the material of good thermal shock, many excellent properties such as anti-oxidant, corrosion-resistant, wear-resistant, make valve be more suitable for the change of environment, longer service life.But due to nonmetallic phase and Metal Phase poor compatibility, easily make composition occur segregation, structural homogenity is poor, intensity is uneven, occur piebald, running-in ability is poor, wears no resistance, larger pressure can not be born, heat declines seriously, and cracking resistance can be poor, and thermal fatigue resistance can be poor, reduce serviceability, shorten service life.
The performance of iron-base powder metallurgy material can be improved by feed change, the performance of material can also be improved by the compatibility improving nonmetallic phase and Metal Phase.
Summary of the invention
The object of the present invention is to provide a kind of valve high rigidity iron-base powder metallurgy material and preparation method thereof, the feature such as this valve material has full densification, hardness is high, room temperature bending strength good and mechanical behavior under high temperature is excellent, cost performance is high, industrial production prospect good.
Technical scheme of the present invention is as follows:
A kind of valve high rigidity iron-base powder metallurgy material, it is characterized in that being made up of the raw material of following weight portion: aquadag 0.6-0.9, carbon dust 0.2-0.4, molybdenum dioxide 5-7, oxide nano rare earth 1.2-1.5, black silicon carbide 7-9, lithium 1-2, sodium borohydride 0.5-0.9, calcium-silicon powder 2-4, copper 5-6, zinc 4-6, SILICA FUME 1.2-1.5, silane coupler kh-550 0.6-0.8, 1% sodium carbonate liquor is appropriate, water is appropriate, inferior sodium phosphate 2.5-3.5, polyethylene glycol 0.4-0.6, 2Mol/L copper-bath 30-35, wetting aid 2-3, iron powder 60-64,
Described wetting aid is made up of the raw material of following weight portion: SrCl 0.1-0.2, P2O5 0.2-0.4, sodium stannate 0.4-0.6, K
2zrF
62.3-2.8, Mo1.3-1.6, nanometer LA2O3 0.6-0.9, ceria nanopowder 0.3-0.5, nano-sized carbon 0.2-0.4, aluminium powder 0.6-0.9, NaF0.1-0.2, acetone 8-10, PEG400 0.1-0.2; Preparation method is: added by PEG400 in acetone, stir, add nanometer LA2O3, ceria nanopowder again, under 8000-10000 rev/min, stir 10-15 minute, ultrasonic disperse 4-5 minute, then add other residual components stirring 10-15 minute, ultrasonic disperse 4-5 minute, spraying dry, sends in vacuum high temperature furnace, be evacuated to≤10
-2pa, then pass into argon gas, be heated to 1300-1400 DEG C, insulation 20-30 minute, cooling, pulverizes, to obtain final product.
The preparation method of described valve high rigidity iron-base powder metallurgy material, is characterized in that comprising the following steps:
(1) by molybdenum dioxide, SILICA FUME, black silicon carbide, oxide nano rare earth mixing, add in 1% sodium carbonate liquor of 3-4 times of weight portion, be heated to 40-50 DEG C, stir 10-15 minute, filter, add the water washing of 3-4 times of weight portion, repeated washing 2-3 time, filters, obtains filter cake;
(2) mixed with wetting aid by filter cake, grinding 30-40 minute, adds the water of 4-5 times of weight portion, add silane coupler kh-550, stir 10-15 minute, be heated to 60-70 DEG C, then add the iron powder of copper, zinc, 0.5-0.9 weight portion, stir 30-40 minute, filter, spraying dry under an atmosphere of hydrogen, pulverize, cross 130 mesh sieves, obtain powder;
(3) powder that (2) step obtains is added in 2Mol/L copper-bath, add polyethylene glycol, inferior sodium phosphate, be heated to 60-70 DEG C, stirring reaction 1-2 hour, filter, be washed with water to neutrality, pass into hot hydrogen and dry, pulverize, obtain powder;
(4) powder that (3) step obtains is mixed with other residual components, ball milling, shaping, sintering, finished machined, to obtain final product.
Beneficial effect of the present invention
The feature such as valve material of the present invention has full densification, hardness is high, room temperature bending strength good and mechanical behavior under high temperature is excellent, cost performance is high, industrial production prospect good; Manufacture craft of the present invention makes Metal Phase and nonmetallic phase mutually intert, and combines closely, and adds wetability and the caking property of nonmetallic phase and Metal Phase, can prevent component segregation, makes material structure even, adds intensity and toughness; The wetting aid of the application of the invention, can increase the wettability of metal pair nonmetallic phase, increases fatigue strength and the toughness of valve.
Detailed description of the invention
A kind of valve high rigidity iron-base powder metallurgy material, is made up of the raw material of following weight portion (kilogram): aquadag 0.7, carbon dust 0.3, molybdenum dioxide 6, oxide nano rare earth 1.3, black silicon carbide 8, lithium 1.5, sodium borohydride 0.6, calcium-silicon powder 3, copper 5.5, zinc 5, SILICA FUME 1.3, silane coupler kh-550 0.7,1% sodium carbonate liquor are appropriate, water appropriate, inferior sodium phosphate 3, polyethylene glycol 0.5,2Mol/L copper-bath 33, wetting aid 2.5, iron powder 62;
Described wetting aid is made up of the raw material of following weight portion (kilogram): SrCl 0.1, P2O5 0.3, sodium stannate 0.5, K
2zrF
62.5, Mo1.5, nanometer LA2O3 0.7, ceria nanopowder 0.4, nano-sized carbon 0.3, aluminium powder 0.7, NaF0.1, acetone 9, PEG400 0.1; Preparation method is: added by PEG400 in acetone, stir, add nanometer LA2O3, ceria nanopowder again, stir 13 minutes under 9000 revs/min, ultrasonic disperse 4 minutes, then add other residual components and stir 14 minutes, ultrasonic disperse 5 minutes, spraying dry, sends in vacuum high temperature furnace, be evacuated to≤10
-2pa, then pass into argon gas, be heated to 1350 DEG C, be incubated 25 minutes, cooling, pulverize, to obtain final product.
The preparation method of described valve high rigidity iron-base powder metallurgy material, comprises the following steps:
(1) by molybdenum dioxide, SILICA FUME, black silicon carbide, oxide nano rare earth mixing, add in 1% sodium carbonate liquor of 3.5 times of weight portions, be heated to 45 DEG C, stir 13 minutes, filter, add the water washing of 3.5 times of weight portions, repeated washing 2 times, filters, obtains filter cake;
(2) filter cake is mixed with wetting aid, grind 35 minutes, add the water of 4.5 times of weight portions, add silane coupler kh-550, stir 13 minutes, be heated to 65 DEG C, then add the iron powder of copper, zinc, 0.7 weight portion, stir 35 minutes, filter, spraying dry under an atmosphere of hydrogen, pulverize, cross 130 mesh sieves, obtain powder;
(3) powder that (2) step obtains is added in 2Mol/L copper-bath, add polyethylene glycol, inferior sodium phosphate, be heated to 65 DEG C, stirring reaction 1.5 hours, filter, be washed with water to neutrality, pass into hot hydrogen and dry, pulverize, obtain powder;
(4) powder that (3) step obtains is mixed with other residual components, ball milling, shaping, sintering, finished machined, to obtain final product.
Experimental data:
The hardness HB of this embodiment valve material is 66 after tested, and density is 96.19%, voidage 9.11%, and fracture toughness is 14.9MPam
1/2, compression strength is 157MPa, and bending strength is 507MPa.
Claims (2)
1. a valve high rigidity iron-base powder metallurgy material, it is characterized in that being made up of the raw material of following weight portion: aquadag 0.6-0.9, carbon dust 0.2-0.4, molybdenum dioxide 5-7, oxide nano rare earth 1.2-1.5, black silicon carbide 7-9, lithium 1-2, sodium borohydride 0.5-0.9, calcium-silicon powder 2-4, copper 5-6, zinc 4-6, SILICA FUME 1.2-1.5, silane coupler kh-550 0.6-0.8, 1% sodium carbonate liquor is appropriate, water is appropriate, inferior sodium phosphate 2.5-3.5, polyethylene glycol 0.4-0.6, 2Mol/L copper-bath 30-35, wetting aid 2-3, iron powder 60-64,
Described wetting aid is made up of the raw material of following weight portion: SrCl 0.1-0.2, P2O5 0.2-0.4, sodium stannate 0.4-0.6, K
2zrF
62.3-2.8, Mo1.3-1.6, nanometer LA2O3 0.6-0.9, ceria nanopowder 0.3-0.5, nano-sized carbon 0.2-0.4, aluminium powder 0.6-0.9, NaF0.1-0.2, acetone 8-10, PEG400 0.1-0.2; Preparation method is: added by PEG400 in acetone, stir, add nanometer LA2O3, ceria nanopowder again, under 8000-10000 rev/min, stir 10-15 minute, ultrasonic disperse 4-5 minute, then add other residual components stirring 10-15 minute, ultrasonic disperse 4-5 minute, spraying dry, sends in vacuum high temperature furnace, be evacuated to≤10
-2pa, then pass into argon gas, be heated to 1300-1400 DEG C, insulation 20-30 minute, cooling, pulverizes, to obtain final product.
2. the valve preparation method of high rigidity iron-base powder metallurgy material according to claim 1, is characterized in that comprising the following steps:
(1) by molybdenum dioxide, SILICA FUME, black silicon carbide, oxide nano rare earth mixing, add in 1% sodium carbonate liquor of 3-4 times of weight portion, be heated to 40-50 DEG C, stir 10-15 minute, filter, add the water washing of 3-4 times of weight portion, repeated washing 2-3 time, filters, obtains filter cake;
(2) mixed with wetting aid by filter cake, grinding 30-40 minute, adds the water of 4-5 times of weight portion, add silane coupler kh-550, stir 10-15 minute, be heated to 60-70 DEG C, then add the iron powder of copper, zinc, 0.5-0.9 weight portion, stir 30-40 minute, filter, spraying dry under an atmosphere of hydrogen, pulverize, cross 130 mesh sieves, obtain powder;
(3) powder that (2) step obtains is added in 2Mol/L copper-bath, add polyethylene glycol, inferior sodium phosphate, be heated to 60-70 DEG C, stirring reaction 1-2 hour, filter, be washed with water to neutrality, pass into hot hydrogen and dry, pulverize, obtain powder;
(4) powder that (3) step obtains is mixed with other residual components, ball milling, shaping, sintering, finished machined, to obtain final product.
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| CN201410819016.5A CN104588640A (en) | 2014-12-25 | 2014-12-25 | High-hardness ferrum-based powder metallurgy material for valve and preparing method thereof |
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| CN201410819016.5A CN104588640A (en) | 2014-12-25 | 2014-12-25 | High-hardness ferrum-based powder metallurgy material for valve and preparing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105251980A (en) * | 2015-10-21 | 2016-01-20 | 李学峰 | High-hardness automotive connection rod forged through ferrum-based powder in metallurgical manner and manufacturing method thereof |
| CN105328194A (en) * | 2015-10-21 | 2016-02-17 | 马聪 | High-tensile-strength ferrum-based powder metallurgy forging automobile connecting rod and manufacturing method thereof |
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| CN105328194A (en) * | 2015-10-21 | 2016-02-17 | 马聪 | High-tensile-strength ferrum-based powder metallurgy forging automobile connecting rod and manufacturing method thereof |
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Application publication date: 20150506 |