CN105838999A - Casting method of combined valve body adopting nickel-titanium alloy surface modification - Google Patents
Casting method of combined valve body adopting nickel-titanium alloy surface modification Download PDFInfo
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- CN105838999A CN105838999A CN201610343114.5A CN201610343114A CN105838999A CN 105838999 A CN105838999 A CN 105838999A CN 201610343114 A CN201610343114 A CN 201610343114A CN 105838999 A CN105838999 A CN 105838999A
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- casting
- valve body
- coating
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- oozed
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2251/00—Treating composite or clad material
- C21D2251/02—Clad material
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a casting method of a combined valve body adopting nickel-titanium alloy surface modification. The casting method comprises steps as follows: (1), a pouring liquid is prepared and comprises chemical components in percentage by weight as follows: 0.22%-0.26% of C, 0.25%-0.45% of Si, 0.60%-0.80% of Mn, 0.20%-0.30% of Ti, 0.05%-0.10% of Ce, 0.20%-0.40% of Cu, 0.10%-0.15% of Nb, smaller than or equal to 0.03% of P, smaller than or equal to 0.02% of S and the balance of Fe; step (2), a casting-infiltration coating is prepared; (3), valve pouring is performed; (4), heat treatment and finishing are performed. According to the valve body obtained with the casting method, the uniform and stable casting-infiltration composite layer is formed on the surface; furthermore, the valve body has the advantage of high toughness, excellent wear resistance and anti-corrosion performance, high finished product ratio, stable quality, good appearance quality and usability, long service life and wide applicable range.
Description
Technical field
The present invention relates to valve casting technology field, particularly relate to a kind of Nitinol surface modification and be combined the casting method of valve body.
Background technology
Valve is flowable materials conveying and the vitals controlled, and in use, in addition to the requirement of the technical specifications such as temperature to be met, pressure, is also adapted to the different needs of heterogeneity material, such as corrosion, wear, adhesion etc..Meanwhile, sealing property and the service life of valve is also highly important technical specification.
Casting infiltration is at mo(U)ld face by raw material furnishing coating application such as alloyed powders, parent metal immersion antireflective coating material capillary porosity during cast, rely on molten metal heat to make alloy powder melt, melt, combine together with parent metal, thus form the surface composite layer with superperformance at cast(ing) surface.Infiltration technology is promoting while cast properties, has and need not the advantage that special equipment, technique are simple, with short production cycle, with low cost.But, it is susceptible to the problems such as pore, slag inclusion and surface composite layer uneven thickness due to Infiltration technology, causes casting flaw when being applied to valve body production, affect presentation quality and the service life of valve body.Document " research of casting infiltration raising cast steel valve wearability " uses technology of infiltration casting to prepare the valve that flushing resistance is good, improves the service life of valve, but it also indicates that simultaneously, and the problem of casting quality layer poor stability yet suffers from, and need to improve further.Therefore, selecting suitable processing temperature, suitable base material and casting to ooze coating, optimize casting method, improving technology of infiltration casting, to be combined the quality stability of valve body moulding most important.
Summary of the invention
The object of the invention is contemplated to make up the defect of prior art, it is provided that a kind of steady quality, presentation quality and serviceability are good, the Nitinol surface modification of length in service life is combined the casting method of valve body.
The present invention is achieved by the following technical solutions:
A kind of Nitinol surface modification is combined the casting method of valve body, comprises the following steps:
(1) preparation potting syrup, the chemical component weight percentage ratio of described potting syrup is as follows: C:0.22%-0.26%, Si:0.25%-0.45%, Mn:0.60%-0.80%, Ti:0.20%-0.30%, Ce:0.05%-0.10%, Cu:0.20%-0.40%, Nb:0.10%-0.15%, P≤0.03%, S≤0.02%, surplus is Fe, each raw material is i.e. obtained potting syrup in medium-frequency induction furnace after 1580-1620 DEG C of melting, adjustment chemical composition;
(2) coating is oozed in preparation casting, described casting is oozed coating and is prepared by the raw materials in: 200-300 mesh molybdenum-iron powder 35-45,200-300 mesh Nitinol powder 10-15, polyvinyl alcohol 0.5-1, acrylic acid 0.1-0.2, cellulose acetate 0.1-0.2, Ammonium persulfate. 0.01-0.015, Lithium metasilicate 2-4, sodium fluoride 1-2, CNT 1-2, silane resin acceptor kh-550 0.5-1, aqueous polyurethane emulsion R-3607 0.5-1;It is first by uniform for dispersed with stirring in CNT, cellulose acetate and silane resin acceptor kh-550 addition ethanol in proper amount that the preparation method of coating is oozed in described casting, it is subsequently adding molybdenum-iron powder, Nitinol powder stirring 1-2h, it is dried and removes 100-120 DEG C of process 0.5-1h after ethanol, obtain component A;Polyvinyl alcohol first adds 85-95 DEG C of dissolving in suitable quantity of water completely, be subsequently adding acrylic acid and Ammonium persulfate. 60-70 DEG C stirring 2-4h, after cooling, obtain B component;Component A, B component is uniform with remaining raw material mixed grinding, obtain casting and ooze coating;
(3) cast valve body, first by core in 220-240 DEG C of drying and processing 4-6h, then casting is oozed coating and is coated uniformly on core surface, coating thickness is 1.5-2.5mm, process 1-2h, then mould assembling then at 160-180 DEG C, then potting syrup is poured into a mould under the conditions of 1520-1560 DEG C, it is cooled to room temperature with 20-30 DEG C/h, then carries out finishing;
(4) heat treatment, valve body after step (3) being processed is in 200-300 DEG C of isothermal holding 2-4h, then it is to slowly warm up to 800-850 DEG C of isothermal holding 6-8h with 60-80 DEG C/h, again with 30-50 DEG C/h of slow cooling to 600-650 DEG C of isothermal holding 4-6h, finally it is slowly dropped to room temperature with 50-60 DEG C/h, again obtains finished product after finishing.
The invention have the advantage that
The present invention utilizes CNT, cellulose acetate and silane resin acceptor kh-550 that molybdenum-iron powder, Nitinol powder are carried out surface coating modification as casting infiltration layer material; alloy powder is had good surface protection effect; improve the wettability with molten metal, strengthen metallurgical interface bond strength;Using acrylic acid modified polyvinyl alcohol as binding agent, bond strength is high, and can form stable capillary gap, improves molten metal and wettability that casting is oozed between coating, advantageously forms uniform, stable casting infiltration layer;Being processed by the mixed grinding of remaining raw material, the casting obtained is oozed coating and is fused with metallic matrix through cast, and the compound valve body matrix obtained, through the subsequent processing steps such as Overheating Treatment, finishing, finally gives finished product again.The valve body obtained by casting method of the present invention, surface forms uniform, stable casting and oozes composite bed, and has high tenacity and excellent wear-resistant, corrosion resistance, and yield rate is high, steady quality, presentation quality and serviceability are good, service life is long, applied widely.
Detailed description of the invention
A kind of Nitinol surface modification is combined the casting method of valve body, comprises the following steps:
(1) preparation potting syrup, wherein the chemical component weight percentage ratio of potting syrup is as follows: C:0.22%, Si:0.25%, Mn:0.60%, Ti:0.20%, Ce:0.05%, Cu:0.20%, Nb:0.10%, P:0.03%, S:0.02%, surplus is Fe, each raw material is i.e. obtained potting syrup in medium-frequency induction furnace after 1580 DEG C of meltings, adjustment chemical composition;
(2) coating is oozed in preparation casting, wherein casting is oozed coating and is made up of the raw material of following weight (kg): 200 mesh molybdenum-iron powder 35,200 mesh Nitinol powder 10, polyvinyl alcohol 0.5, acrylic acid 0.1, cellulose acetate 0.1, Ammonium persulfate. 0.01, Lithium metasilicate 2, sodium fluoride 1, CNT 1, silane resin acceptor kh-550
0.5, aqueous polyurethane emulsion R-3607 0.5;It is first by uniform for dispersed with stirring in CNT, cellulose acetate and silane resin acceptor kh-550 addition ethanol in proper amount that the preparation method of coating is oozed in described casting, it is subsequently adding molybdenum-iron powder, Nitinol powder stirring 1h, it is dried and removes 100 DEG C of process 0.5h after ethanol, obtain component A;Polyvinyl alcohol first adds 85 DEG C of dissolvings in suitable quantity of water completely, be subsequently adding acrylic acid and Ammonium persulfate. 60 DEG C stirring 2h, after cooling, obtain B component;Component A, B component is uniform with remaining raw material mixed grinding, obtain casting and ooze coating;
(3) cast valve body, first by core in 220 DEG C of drying and processing 4h, then oozes casting coating and is coated uniformly on core surface, coating thickness is 1.5mm, processes 1h, then mould assembling then at 160 DEG C, again potting syrup is poured into a mould under the conditions of 1520 DEG C, be cooled to room temperature with 20 DEG C/h, then carry out finishing;
(4) heat treatment, valve body after step (3) being processed, in 200 DEG C of isothermal holding 2h, is then to slowly warm up to 800 DEG C of isothermal holding 6h with 60 DEG C/h, then with 30 DEG C/h of slow coolings to 600 DEG C of isothermal holding 4h, finally it is slowly dropped to room temperature with 50 DEG C/h, again obtains finished product after finishing.
Wherein the model of molybdenum-iron powder selects FeMo60.
The performance test results of the said goods is as follows:
Casting infiltration layer intensity is 61.4HRC, and service life is 6 times of common WCB valve body, and during actual condition uses, composite bed will not peel off, ftracture, and operation conditions is good.
Claims (1)
1. a Nitinol surface modification is combined the casting method of valve body, it is characterised in that comprise the following steps:
(1) preparation potting syrup, the chemical component weight percentage ratio of described potting syrup is as follows: C:0.22%-0.26%, Si:0.25%-0.45%, Mn:0.60%-0.80%, Ti:0.20%-0.30%, Ce:0.05%-0.10%, Cu:0.20%-0.40%, Nb:0.10%-0.15%, P≤0.03%, S≤0.02%, surplus is Fe, each raw material is i.e. obtained potting syrup in medium-frequency induction furnace after 1580-1620 DEG C of melting, adjustment chemical composition;
(2) coating is oozed in preparation casting, described casting is oozed coating and is prepared by the raw materials in: 200-300 mesh molybdenum-iron powder 35-45,200-300 mesh Nitinol powder 10-15, polyvinyl alcohol 0.5-1, acrylic acid 0.1-0.2, cellulose acetate 0.1-0.2, Ammonium persulfate. 0.01-0.015, Lithium metasilicate 2-4, sodium fluoride 1-2, CNT 1-2, silane resin acceptor kh-550 0.5-1, aqueous polyurethane emulsion R-3607 0.5-1;It is first by uniform for dispersed with stirring in CNT, cellulose acetate and silane resin acceptor kh-550 addition ethanol in proper amount that the preparation method of coating is oozed in described casting, it is subsequently adding molybdenum-iron powder, Nitinol powder stirring 1-2h, it is dried and removes 100-120 DEG C of process 0.5-1h after ethanol, obtain component A;Polyvinyl alcohol first adds 85-95 DEG C of dissolving in suitable quantity of water completely, be subsequently adding acrylic acid and Ammonium persulfate. 60-70 DEG C stirring 2-4h, after cooling, obtain B component;Component A, B component is uniform with remaining raw material mixed grinding, obtain casting and ooze coating;
(3) cast valve body, first by core in 220-240 DEG C of drying and processing 4-6h, then casting is oozed coating and is coated uniformly on core surface, coating thickness is 1.5-2.5mm, process 1-2h, then mould assembling then at 160-180 DEG C, then potting syrup is poured into a mould under the conditions of 1520-1560 DEG C, it is cooled to room temperature with 20-30 DEG C/h, then carries out finishing;
(4) heat treatment, valve body after step (3) being processed is in 200-300 DEG C of isothermal holding 2-4h, then it is to slowly warm up to 800-850 DEG C of isothermal holding 6-8h with 60-80 DEG C/h, again with 30-50 DEG C/h of slow cooling to 600-650 DEG C of isothermal holding 4-6h, finally it is slowly dropped to room temperature with 50-60 DEG C/h, again obtains finished product after finishing.
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101412097A (en) * | 2008-12-03 | 2009-04-22 | 西安建筑科技大学 | Method for preparing cyclone separator steel bushing inner lining wear-resistant composite bed |
CN104310388A (en) * | 2014-10-15 | 2015-01-28 | 宁波墨西科技有限公司 | Graphene composite powder material and preparation method thereof |
JP2015193874A (en) * | 2014-03-31 | 2015-11-05 | Jfeスチール株式会社 | Thick steel plate excellent in abrasion resistance and manufacturing method therefor |
CN105081285A (en) * | 2015-09-29 | 2015-11-25 | 河南科技大学 | Cast-infiltration method for improving surface corrosion resistance of casting |
CN105268909A (en) * | 2015-10-21 | 2016-01-27 | 南京润屹电子科技有限公司 | Graphene enhanced type valve casting-penetration composition and application method thereof |
-
2016
- 2016-05-23 CN CN201610343114.5A patent/CN105838999A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101412097A (en) * | 2008-12-03 | 2009-04-22 | 西安建筑科技大学 | Method for preparing cyclone separator steel bushing inner lining wear-resistant composite bed |
JP2015193874A (en) * | 2014-03-31 | 2015-11-05 | Jfeスチール株式会社 | Thick steel plate excellent in abrasion resistance and manufacturing method therefor |
CN104310388A (en) * | 2014-10-15 | 2015-01-28 | 宁波墨西科技有限公司 | Graphene composite powder material and preparation method thereof |
CN105081285A (en) * | 2015-09-29 | 2015-11-25 | 河南科技大学 | Cast-infiltration method for improving surface corrosion resistance of casting |
CN105268909A (en) * | 2015-10-21 | 2016-01-27 | 南京润屹电子科技有限公司 | Graphene enhanced type valve casting-penetration composition and application method thereof |
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