CN104789917A - High-chrome steel powder for thermal spraying and preparation method thereof - Google Patents
High-chrome steel powder for thermal spraying and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high-chrome steel powder for thermal spraying and a preparation method thereof. The high-chrome steel powder is prepared from the following chemical components in percentage by weight: 0.33-0.39 percent of C, 0.47-1.22 percent of Si, 2.87-2.95 percent of Cr, 1.5-3.0 percent of Mn, 0.42-0.58 percent of Cu, 0.25-0.37 percent of Ti, 0.46-0.57 percent of Mo, 0.25-0.37 percent of Zr, 0.55-0.69 percent of Pd, 0.5-2.0 percent of Ni, 0.12-0.23 percent of lanthanides and the balance of Fe and inevitable impurities, wherein the sum of the weight percentage of Mn and Ni is 3.2-4.6 percent; the total content of the impurities is less than or equal to 0.1 percent, and the impurities comprise the following ingredients in percentage by weight: less than or equal to 0.015 percent of P, less than or equal to 0.028 percent of S, less than or equal to 0.01 percent of H, less than or equal to 0.002 percent of N and less than or equal to 0.015 percent of O; the lanthanides comprise the following ingredients in percentage by weight: 22-27 percent of Ce, 8-12 percent of Eu, 5-12 percent of Gd, 10-17 percent of Pr, 2-4 percent of Sm, 10-16 percent of Ho and the balance of La, and the sum of the weight percentage of the ingredients is 100 percent. Compared with other materials used in the thermal spraying technology, the thermal spraying powder provides good oxidation resistance and wear resistance with low cost. The thermal spraying powder has a lower melting point, so that the thermal spraying powder saves energy and only needs lower temperature in the thermal spraying technology.
Description
Technical field
The present invention relates to a kind of heat spray coating layer material and preparation method thereof, a kind of high chromium steel powder for thermospray and preparation method thereof, belongs to technical field of hot specifically.
Background technology
The coating applied by thermospray is used to many application known morning.Such as, in vehicular engine, the surface of the cylinder running surface of oil lubrication is particularly undertaken being coated with the quite a long time by plasma spraying, described coating especially significantly can reduce the frictional coefficient between piston ring and cylinder wall, thus significantly reduce the wearing and tearing of piston ring and cylinder, service life of aeroengine is increased, and maintenance period (such as changing oil) extends, and also makes motor performance significantly improve.
Compared with other coating, iron base heat spray coating has more excellent mechanical property, magnetic performance and corrosion resistance nature.Meanwhile, iron-based families of coatings has abundant natural resources, cheap material cost, thus causes the research boom of people.But the same with other coatings, in the test of traditional macro-mechanical property, often there is inhomogeneous deformation in iron-based coating, concentration of plastic deformation, at the shear zone of minority, shows as macroscopical fragility.This feature of iron-based coating limits its application in engineering field to a great extent.Therefore, how under the prerequisite keeping Fe-based amorphous high strength, improving Fe-based amorphous plastic deformation ability, increase toughness, is promote the realistic problem needing solution in iron-based coating application process badly.
Summary of the invention
Technical problem to be solved by this invention is, proposes a kind of high chromium steel powder for thermospray and preparation method thereof, can carry out toughness reinforcing improvement, retain the high strength that it is intrinsic simultaneously, high-wearing feature feature to coating, for large-scale engineer applied provides possibility.
The present invention solves the technical scheme of above technical problem: provide a kind of high chromium steel powder for thermospray, its chemical component weight per-cent is: C:0.33-0.39%, Si:0.47-1.22%, Cr:2.87-2.95%, Mn:1.5-3.0%, Cu:0.42-0.58%, Ti:0.25-0.37%, Mo:0.46-0.57%, Zr:0.25-0.37%, Pd:0.55-0.69%, Ni:0.5-2.0%, and to meet Mn and Ni sum be 3.2-4.6%, lanthanide rare: 0.12-0.23%, all the other are Fe and inevitable impurity; Total content≤0.1% of described impurity, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%; The constituent mass per-cent of described lanthanide rare is: cerium: 22-27%, europium: 8-12%, gadolinium: 5-12%, praseodymium: 10-17%, samarium: 2-4%, holmium: 10-16%, and surplus is lanthanum, and above each component sum is 100%.
Further restriction technical scheme of the present invention, the aforesaid high chromium steel powder for thermospray, its chemical component weight per-cent is: C:0.33%, Si:0.47%, Cr:2.87%, Mn:1.5%, Cu:0.42%, Ti:0.25%, Mo:0.46%, Zr:0.25%, Pd:0.55%, Ni:0.5%, lanthanide rare: 0.12%, all the other are Fe and inevitable impurity; The total content of described impurity: 0.1%, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%;
The constituent mass per-cent of described lanthanide rare is: cerium: 22%, europium: 8%, gadolinium: 5%, praseodymium: 10%, samarium: 2%, holmium: 10%, and surplus is lanthanum, and above each component sum is 100%.
The aforesaid high chromium steel powder for thermospray, its chemical component weight per-cent is: C:0.35%, Si:0.67%, Cr:2.91%, Mn:2.1%, Cu:0.52%, Ti:0.31%, Mo:0.52%, Zr:0.34%, Pd:0.61%, Ni:1.2%, lanthanide rare: 0.18%, all the other are Fe and inevitable impurity; The total content of described impurity: 0.08%, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%; The constituent mass per-cent of described lanthanide rare is: cerium: 25%, europium: 10%, gadolinium: 9%, praseodymium: 14%, samarium: 3%, holmium: 14%, and surplus is lanthanum, and above each component sum is 100%.
The aforesaid high chromium steel powder for thermospray, its chemical component weight per-cent is: C:0.39%, Si:1.22%, Cr:2.95%, Mn:3.0%, Cu:0.58%, Ti:0.37%, Mo:0.57%, Zr:0.37%, Pd:0.69%, Ni:2.0%, lanthanide rare: 0.23%, all the other are Fe and inevitable impurity; The total content of described impurity: 0.09%, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%;
The constituent mass per-cent of described lanthanide rare is: cerium: 27%, europium: 12%, gadolinium: 12%, praseodymium: 17%, samarium: 4%, holmium: 16%, and surplus is lanthanum, and above each component sum is 100%.
The preparation method of the aforesaid high chromium steel powder for thermospray, comprises the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 18-22 DEG C, and soak time is 1-1.5h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 130-150 DEG C, time of drying 35-55min;
(3) metal pulverization process: dried metal cools is to normal temperature, put into ball mill to pulverize, in ball mill, ball material mass ratio is 3-4:1, and the ball mill pulverizing time is 10-15h, rotating speed 210-250r/min, injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 6-8:1, the ball mill pulverizing time is 5-7h, and rotating speed 300-350r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
The preparation method of the aforesaid high chromium steel powder for thermospray, comprises the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 18 DEG C, and soak time is 1.5h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 130 DEG C, time of drying 55min;
(3) metal pulverization process: dried metal cools, to normal temperature, is put into ball mill and pulverized, in ball mill, ball material mass ratio is 3:1, and the ball mill pulverizing time is 15h, and rotating speed 210r/min injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 6:1, and the ball mill pulverizing time is 5h, and rotating speed 350r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
The preparation method of the aforesaid high chromium steel powder for thermospray, comprises the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 20 DEG C, and soak time is 1h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 140 DEG C, time of drying 40min;
(3) metal pulverization process: dried metal cools, to normal temperature, is put into ball mill and pulverized, in ball mill, ball material mass ratio is 4:1, and the ball mill pulverizing time is 14h, and rotating speed 230r/min injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 7:1, and the ball mill pulverizing time is 6h, and rotating speed 320r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
Further, the preparation method of the aforesaid high chromium steel powder for thermospray, comprises the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 22 DEG C, and soak time is 1h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 150 DEG C, time of drying 35min;
(3) metal pulverization process: dried metal cools, to normal temperature, is put into ball mill and pulverized, in ball mill, ball material mass ratio is 4:1, and the ball mill pulverizing time is 15h, and rotating speed 210r/min injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 8:1, and the ball mill pulverizing time is 7h, and rotating speed 300r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
Beneficial effect of the present invention:
The powder that the present invention uses in hot-spraying techniques is compared with other material, this hot spray powder provides excellent resistance to oxidation and wear resisting property inexpensively, this hot spray powder also has lower fusing point, and therefore in hot-spraying techniques, save energy ground only needs lower temperature.This hot spray powder also can be applied on metal body and can not cause damage to body.In addition, compared with other iron used in hot-spraying techniques, this hot spray powder can provide the antioxidant property of improvement in hot-spraying techniques.
Embodiment
embodiment 1
The present embodiment is a kind of high chromium steel powder for thermospray, and its chemical component weight per-cent is: C:0.33%, Si:0.47%, Cr:2.87%, Mn:1.5%, Cu:0.42%, Ti:0.25%, Mo:0.46%, Zr:0.25%, Pd:0.55%, Ni:0.5%, lanthanide rare: 0.12%, all the other are Fe and inevitable impurity; The total content of described impurity: 0.1%, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%;
The constituent mass per-cent of described lanthanide rare is: cerium: 22%, europium: 8%, gadolinium: 5%, praseodymium: 10%, samarium: 2%, holmium: 10%, and surplus is lanthanum, and above each component sum is 100%.
The present embodiment provides a kind of preparation method of the high chromium steel powder for thermospray, comprises the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 18 DEG C, and soak time is 1.5h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 130 DEG C, time of drying 55min;
(3) metal pulverization process: dried metal cools, to normal temperature, is put into ball mill and pulverized, in ball mill, ball material mass ratio is 3:1, and the ball mill pulverizing time is 15h, and rotating speed 210r/min injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 6:1, and the ball mill pulverizing time is 5h, and rotating speed 350r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
embodiment 2
A kind of high chromium steel powder for thermospray of the present embodiment, its chemical component weight per-cent is: C:0.35%, Si:0.67%, Cr:2.91%, Mn:2.1%, Cu:0.52%, Ti:0.31%, Mo:0.52%, Zr:0.34%, Pd:0.61%, Ni:1.2%, lanthanide rare: 0.18%, all the other are Fe and inevitable impurity; The total content of described impurity: 0.08%, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%; The constituent mass per-cent of described lanthanide rare is: cerium: 25%, europium: 10%, gadolinium: 9%, praseodymium: 14%, samarium: 3%, holmium: 14%, and surplus is lanthanum, and above each component sum is 100%.
The present embodiment provides a kind of preparation method of the high chromium steel powder for thermospray, comprises the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 20 DEG C, and soak time is 1h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 140 DEG C, time of drying 40min;
(3) metal pulverization process: dried metal cools, to normal temperature, is put into ball mill and pulverized, in ball mill, ball material mass ratio is 4:1, and the ball mill pulverizing time is 14h, and rotating speed 230r/min injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 7:1, and the ball mill pulverizing time is 6h, and rotating speed 320r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
embodiment 3
The present embodiment is a kind of high chromium steel powder for thermospray, and its chemical component weight per-cent is: C:0.39%, Si:1.22%, Cr:2.95%, Mn:3.0%, Cu:0.58%, Ti:0.37%, Mo:0.57%, Zr:0.37%, Pd:0.69%, Ni:2.0%, lanthanide rare: 0.23%, all the other are Fe and inevitable impurity; The total content of described impurity: 0.09%, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%;
The constituent mass per-cent of described lanthanide rare is: cerium: 27%, europium: 12%, gadolinium: 12%, praseodymium: 17%, samarium: 4%, holmium: 16%, and surplus is lanthanum, and above each component sum is 100%.
The present embodiment provides a kind of preparation method of the high chromium steel powder for thermospray, comprises the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 22 DEG C, and soak time is 1h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 150 DEG C, time of drying 35min;
(3) metal pulverization process: dried metal cools, to normal temperature, is put into ball mill and pulverized, in ball mill, ball material mass ratio is 4:1, and the ball mill pulverizing time is 15h, and rotating speed 210r/min injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 8:1, and the ball mill pulverizing time is 7h, and rotating speed 300r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (8)
1. for a high chromium steel powder for thermospray, it is characterized in that: its chemical component weight per-cent is: C:0.33-0.39%, Si:0.47-1.22%, Cr:2.87-2.95%, Mn:1.5-3.0%, Cu:0.42-0.58%, Ti:0.25-0.37%, Mo:0.46-0.57%, Zr:0.25-0.37%, Pd:0.55-0.69%, Ni:0.5-2.0%, and to meet Mn and Ni sum be 3.2-4.6%, lanthanide rare: 0.12-0.23%, all the other are Fe and inevitable impurity; Total content≤0.1% of described impurity, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%;
The constituent mass per-cent of described lanthanide rare is: cerium: 22-27%, europium: 8-12%, gadolinium: 5-12%, praseodymium: 10-17%, samarium: 2-4%, holmium: 10-16%, and surplus is lanthanum, and above each component sum is 100%.
2., as claimed in claim 1 for the high chromium steel powder of thermospray, it is characterized in that: its chemical component weight per-cent is: C:0.33%, Si:0.47%, Cr:2.87%, Mn:1.5%, Cu:0.42%, Ti:0.25%, Mo:0.46%, Zr:0.25%, Pd:0.55%, Ni:0.5%, lanthanide rare: 0.12%, all the other are Fe and inevitable impurity; The total content of described impurity: 0.1%, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%;
The constituent mass per-cent of described lanthanide rare is: cerium: 22%, europium: 8%, gadolinium: 5%, praseodymium: 10%, samarium: 2%, holmium: 10%, and surplus is lanthanum, and above each component sum is 100%.
3., as claimed in claim 1 for the high chromium steel powder of thermospray, it is characterized in that: its chemical component weight per-cent is: C:0.35%, Si:0.67%, Cr:2.91%, Mn:2.1%, Cu:0.52%, Ti:0.31%, Mo:0.52%, Zr:0.34%, Pd:0.61%, Ni:1.2%, lanthanide rare: 0.18%, all the other are Fe and inevitable impurity; The total content of described impurity: 0.08%, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%;
The constituent mass per-cent of described lanthanide rare is: cerium: 25%, europium: 10%, gadolinium: 9%, praseodymium: 14%, samarium: 3%, holmium: 14%, and surplus is lanthanum, and above each component sum is 100%.
4. the high chromium steel powder for thermospray as described in claim 1, is characterized in that: its chemical component weight per-cent is: C:0.39%, Si:1.22%, Cr:2.95%, Mn:3.0%, Cu:0.58%, Ti:0.37%, Mo:0.57%, Zr:0.37%, Pd:0.69%, Ni:2.0%, lanthanide rare: 0.23%, all the other are Fe and inevitable impurity; The total content of described impurity: 0.09%, its composition is by weight percentage, P≤0.015%, S≤0.028%, H≤0.01%, N≤0.002%, O≤0.015%;
The constituent mass per-cent of described lanthanide rare is: cerium: 27%, europium: 12%, gadolinium: 12%, praseodymium: 17%, samarium: 4%, holmium: 16%, and surplus is lanthanum, and above each component sum is 100%.
5., as claimed in claim 1 for the preparation method of the high chromium steel powder of thermospray, it is characterized in that comprising the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 18-22 DEG C, and soak time is 1-1.5h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 130-150 DEG C, time of drying 35-55min;
(3) metal pulverization process: dried metal cools is to normal temperature, put into ball mill to pulverize, in ball mill, ball material mass ratio is 3-4:1, and the ball mill pulverizing time is 10-15h, rotating speed 210-250r/min, injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 6-8:1, the ball mill pulverizing time is 5-7h, and rotating speed 300-350r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
6., as claimed in claim 5 for the preparation method of the high chromium steel powder of thermospray, it is characterized in that comprising the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 18 DEG C, and soak time is 1.5h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 130 DEG C, time of drying 55min;
(3) metal pulverization process: dried metal cools, to normal temperature, is put into ball mill and pulverized, in ball mill, ball material mass ratio is 3:1, and the ball mill pulverizing time is 15h, and rotating speed 210r/min injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 6:1, and the ball mill pulverizing time is 5h, and rotating speed 350r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
7., as claimed in claim 5 for the preparation method of the high chromium steel powder of thermospray, it is characterized in that comprising the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 20 DEG C, and soak time is 1h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 140 DEG C, time of drying 40min;
(3) metal pulverization process: dried metal cools, to normal temperature, is put into ball mill and pulverized, in ball mill, ball material mass ratio is 4:1, and the ball mill pulverizing time is 14h, and rotating speed 230r/min injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 7:1, and the ball mill pulverizing time is 6h, and rotating speed 320r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
8., as claimed in claim 5 for the preparation method of the high chromium steel powder of thermospray, it is characterized in that comprising the following steps:
(1) metal pre-process: adopt oxalic acid to mix with the ratio of propylene glycol by weight 2:3, make metal surface cleaning agent, carry out surface cleaning to process metal, solution temperature keeps 22 DEG C, and soak time is 1h;
(2) metal drying treatment: drain after pending metal is taken out from solution, place in baking oven and carry out drying treatment, oven temperature is 150 DEG C, time of drying 35min;
(3) metal pulverization process: dried metal cools, to normal temperature, is put into ball mill and pulverized, in ball mill, ball material mass ratio is 4:1, and the ball mill pulverizing time is 15h, and rotating speed 210r/min injects liquid nitrogen cooling in crushing process in ball mill;
(4) metal powder process process: the metal powder material after pulverizing is put into ball mill again and carried out powder process process, in ball mill, ball material mass ratio is 8:1, and the ball mill pulverizing time is 7h, and rotating speed 300r/min injects liquid nitrogen cooling in crushing process in ball mill;
(5) to sieve process: the powder after ball milling sieves according to spraying demand, can obtain finished product.
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Application publication date: 20150722 |