阅读说明：本技术 一种渣浆泵叶轮的制备方法 (Preparation method of slurry pump impeller ) 是由 王亚磊 刘伟 王建宏 何佳 于 2020-12-21 设计创作，主要内容包括：本发明公开了一种渣浆泵叶轮的制备方法,包括以下原料及其重量分数：聚乙烯吡咯烷酮为15—25％质量份；纳米级氧化铝为15—25％质量份；镍粉为8—12％质量份；钴粉为6—10％质量份；钼粉为8—12％质量份；硌粉为7—9％质量份、高碳铬铁为25—35％质量份、表面活性剂为2—4％质量份和分散剂为1—3％质量份。本发明能够有效地改善叶轮组织结构,强化表面层,从而对叶轮表面层成分、组织、性能进行了极大的改善,提高叶轮的表面耐磨性和耐疲劳性,延伸长了叶轮的使用寿命。(The invention discloses a preparation method of a slurry pump impeller, which comprises the following raw materials in parts by weight: 15-25% of polyvinylpyrrolidone; 15-25% of nano-alumina by mass; 8-12% of nickel powder by mass; 6-10% of cobalt powder by mass; 8-12% of molybdenum powder by mass; 7-9% of powdered red iron, 25-35% of high-carbon ferrochrome, 2-4% of surfactant and 1-3% of dispersant. The invention can effectively improve the structure of the impeller and strengthen the surface layer, thereby greatly improving the components, the structure and the performance of the surface layer of the impeller, improving the surface wear resistance and the fatigue resistance of the impeller and prolonging the service life of the impeller.)

1. A preparation method of a slurry pump impeller is characterized by comprising the following steps: comprises the following raw materials in parts by weight: 15-25% of polyvinylpyrrolidone; 15-25% of nano-alumina by mass; 8-12% of nickel powder by mass; 6-10% of cobalt powder by mass; 8-12% of molybdenum powder by mass; 7-9% of powdered red iron, 25-35% of high-carbon ferrochrome, 2-4% of surfactant and 1-3% of dispersant.

2. The method for preparing the slurry pump impeller according to claim 1, wherein the method comprises the following steps: comprises the following raw materials in parts by weight: 20% of polyvinylpyrrolidone by mass; the mass part of the nano-alumina is 15 percent; 10% of nickel powder by mass; 7% of cobalt powder by mass; the molybdenum powder accounts for 8 mass percent; 8 percent of red-iron powder, 29 percent of high-carbon ferrochrome, 2 percent of surfactant and 1 percent of dispersant.

3. The method for preparing the slurry pump impeller according to claim 1, wherein the method comprises the following steps: comprises the following raw materials in parts by weight: the mass portion of the polyvinylpyrrolidone is 18%; the mass part of the nano-alumina is 15 percent; 8% of nickel powder by mass; 6% of cobalt powder by mass; the molybdenum powder accounts for 8 mass percent; 7 mass percent of red-iron powder, 35 mass percent of high-carbon ferrochrome, 2 mass percent of surfactant and 1 mass percent of dispersant.

4. The method for preparing the slurry pump impeller according to claim 1, wherein the method comprises the following steps: the preparation steps are as follows:

a. firstly, putting nanoscale aluminum oxide, nickel powder, cobalt powder, molybdenum powder, chromium powder and high-carbon ferrochrome into a melting furnace for heating and melting until the raw materials are completely melted into metal liquid;

b. after the step a is finished, adding polyvinylpyrrolidone, surfactant and dispersant into the metal liquid, and maintaining the temperature of a melting furnace for melting to prepare impeller metal raw material liquid;

c. after the step b is finished, pouring metal raw material liquid of the impeller into a prepared impeller mold, cooling until the impeller is completely molded, then removing the mold to take out the impeller, mechanically cutting the impeller to a required shape, and then precisely polishing the impeller to obtain the impeller;

d. after the step c is finished, soaking and cleaning the impeller by using alkali liquor, taking out the impeller, soaking the impeller in absolute ethyl alcohol, taking out the impeller and drying the impeller;

e. after the step d is finished, carrying out solid solution modification treatment on the impeller in an electric heating furnace, then introducing mixed gas of neon and nitrogen, heating to 900 ℃ at the heating rate of 0.5 ℃/s, carrying out heat preservation treatment for 50-55 min, then reducing the temperature to 350 ℃ at the cooling rate of 0.7 ℃/s, carrying out heat preservation for 45min, then continuously reducing the temperature to 65 ℃ at the same cooling rate, carrying out heat preservation, then soaking the impeller in a soaking solution at the temperature of 42 ℃, taking out the impeller after soaking for 35min, cleaning the impeller by using deionized water, and drying to constant weight;

f. and e, after the step e is finished, placing the impeller into an ion nitriding furnace, vacuumizing the air pressure in the ion nitriding furnace to 15Pa, introducing helium into the ion nitriding furnace for ion bombardment, stopping introducing the helium when the temperature in the ion nitriding furnace reaches 400-450 ℃, preserving the heat for 1.5 hours, then introducing nitrogen and hydrogen, performing low-pressure ion nitriding, adjusting the introduction pressure of the nitrogen and the hydrogen to ensure that the pressure in the ion nitriding furnace is 200-220 Pa, treating for 4 hours, naturally cooling to room temperature, and then taking out.

5. The method for preparing the slurry pump impeller according to claim 4, wherein the method comprises the following steps: and d, performing soaking and cleaning treatment on the impeller by using alkali liquor for 30-40 min, wherein the soaking and cleaning time is 5-10 min.

6. The method for preparing the slurry pump impeller according to claim 4, wherein the method comprises the following steps: the process conditions of the solid solution modification treatment in the step e are as follows: heating to 225 ℃ at the heating rate of 1.5 ℃/s, and keeping the temperature for 10-20 min.

7. The method for preparing the slurry pump impeller according to claim 4, wherein the method comprises the following steps: the impregnation liquid in the step e is prepared from the following components: triethyl hexyl phosphoric acid, nitric acid, alkylphenol polyoxyethylene, a silane coupling agent, ethanol and deionized water.

Technical Field

The invention relates to the technical field of slurry pumps, in particular to a preparation method of a slurry pump impeller.

Background

The slurry pump is a machine which increases the energy of a solid-liquid mixed medium by the rotation of an impeller of the pump, and is mainly used in the fields of mines, power plants, dredging, metallurgy, chemical industry, building materials, petroleum and the like. The operation principle of the slurry pump is that under the action of centrifugal force, liquid is thrown from the center of an impeller to the outer edge and obtains energy, and the liquid leaves the edge of the impeller at high speed and enters a volute pump shell. In the volute pump casing, the liquid is decelerated due to the gradual expansion of the flow passage, part of kinetic energy is converted into static pressure energy, and finally the static pressure energy flows into a discharge pipeline at higher pressure and is sent to a required place. When the liquid flows from the center of the impeller to the outer edge, a certain vacuum is formed in the center of the impeller, and the liquid is continuously pressed into the impeller because the pressure above the liquid level of the storage tank is higher than the pressure at the inlet of the pump.

Currently, existing slurry pump impellers have some disadvantages, for example; the existing slurry pump impeller does not improve the organization structure and strengthen the surface layer in the preparation process, so that the components, the organization and the performance of the surface layer of the impeller cannot be greatly improved, the surface wear resistance and the fatigue resistance of the impeller are reduced, and the service life of the impeller is shortened; in addition, the prior slurry pump impeller has the defects of common microhardness of the surface of a coating layer, uneven thickness of the coating layer, weaker combination capability of a base material, and poorer fatigue resistance and stress cracking resistance in the preparation process.

Disclosure of Invention

The invention aims to provide a preparation method of a slurry pump impeller, which solves the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the preparation method of the slurry pump impeller comprises the following raw materials in parts by weight: 15-25% of polyvinylpyrrolidone; 15-25% of nano-alumina by mass; 8-12% of nickel powder by mass; 6-10% of cobalt powder by mass; 8-12% of molybdenum powder by mass; 7-9% of powdered red iron, 25-35% of high-carbon ferrochrome, 2-4% of surfactant and 1-3% of dispersant.

As a preferred embodiment of the invention, the preparation method of the slurry pump impeller comprises the following raw materials in parts by weight: 20% of polyvinylpyrrolidone by mass; the mass part of the nano-alumina is 15 percent; 10% of nickel powder by mass; 7% of cobalt powder by mass; the molybdenum powder accounts for 8 mass percent; 8 percent of red-iron powder, 29 percent of high-carbon ferrochrome, 2 percent of surfactant and 1 percent of dispersant.

As a preferred embodiment of the invention, the preparation method of the slurry pump impeller comprises the following raw materials in parts by weight: the mass portion of the polyvinylpyrrolidone is 18%; the mass part of the nano-alumina is 15 percent; 8% of nickel powder by mass; 6% of cobalt powder by mass; the molybdenum powder accounts for 8 mass percent; 7 mass percent of red-iron powder, 35 mass percent of high-carbon ferrochrome, 2 mass percent of surfactant and 1 mass percent of dispersant.

As a preferred embodiment of the present invention, the preparation method of the slurry pump impeller comprises the following preparation steps:

a. firstly, putting nanoscale aluminum oxide, nickel powder, cobalt powder, molybdenum powder, chromium powder and high-carbon ferrochrome into a melting furnace for heating and melting until the raw materials are completely melted into metal liquid;

b. after the step a is finished, adding polyvinylpyrrolidone, surfactant and dispersant into the metal liquid, and maintaining the temperature of a melting furnace for melting to prepare impeller metal raw material liquid;

c. after the step b is finished, pouring metal raw material liquid of the impeller into a prepared impeller mold, cooling until the impeller is completely molded, then removing the mold to take out the impeller, mechanically cutting the impeller to a required shape, and then precisely polishing the impeller to obtain the impeller;

d. after the step c is finished, soaking and cleaning the impeller by using alkali liquor, taking out the impeller, soaking the impeller in absolute ethyl alcohol, taking out the impeller and drying the impeller;

e. after the step d is finished, carrying out solid solution modification treatment on the impeller in an electric heating furnace, then introducing mixed gas of neon and nitrogen, heating to 900 ℃ at the heating rate of 0.5 ℃/s, carrying out heat preservation treatment for 50-55 min, then reducing the temperature to 350 ℃ at the cooling rate of 0.7 ℃/s, carrying out heat preservation for 45min, then continuously reducing the temperature to 65 ℃ at the same cooling rate, carrying out heat preservation, then soaking the impeller in a soaking solution at the temperature of 42 ℃, taking out the impeller after soaking for 35min, cleaning the impeller by using deionized water, and drying to constant weight;

f. and e, after the step e is finished, placing the impeller into an ion nitriding furnace, vacuumizing the air pressure in the ion nitriding furnace to 15Pa, introducing helium into the ion nitriding furnace for ion bombardment, stopping introducing the helium when the temperature in the ion nitriding furnace reaches 400-450 ℃, preserving the heat for 1.5 hours, then introducing nitrogen and hydrogen, performing low-pressure ion nitriding, adjusting the introduction pressure of the nitrogen and the hydrogen to ensure that the pressure in the ion nitriding furnace is 200-220 Pa, treating for 4 hours, naturally cooling to room temperature, and then taking out.

In a preferred embodiment of the present invention, in step d, the impeller is subjected to a soaking and cleaning treatment with alkali liquor, wherein the soaking and cleaning time is 30-40 min, and the soaking and cleaning time is 5-10 min.

As a preferred embodiment of the present invention, the process conditions of the solution modification treatment in the step e are as follows: heating to 225 ℃ at the heating rate of 1.5 ℃/s, and keeping the temperature for 10-20 min.

As a preferred embodiment of the present invention, the impregnation liquid in step e is prepared from the following components: triethyl hexyl phosphoric acid, nitric acid, alkylphenol polyoxyethylene, a silane coupling agent, ethanol and deionized water.

Compared with the prior art, the invention has the following beneficial effects:

1. the impeller of the invention can effectively improve the organization structure of the impeller and strengthen the surface layer through surface treatment in the manufacturing process of the impeller, thereby greatly improving the composition, the organization and the performance of the surface layer of the impeller, improving the surface wear resistance and the fatigue resistance of the impeller and prolonging the service life of the impeller.

2. After the heat treatment and tempering modification treatment, the impeller coating has the advantages of highest surface microhardness, uniform coating thickness, uniform distribution, compactness and integrity, stronger bonding capability of the coating and a base material, finer internal structure grains of the impeller, obviously enhanced structure performance and capability of further improving fatigue resistance and stress cracking resistance.

Detailed Description

Technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.

The invention provides a technical scheme that: the preparation method of the slurry pump impeller comprises the following raw materials in parts by weight: 15-25% of polyvinylpyrrolidone; 15-25% of nano-alumina by mass; 8-12% of nickel powder by mass; 6-10% of cobalt powder by mass; 8-12% of molybdenum powder by mass; 7-9% of powdered red iron, 25-35% of high-carbon ferrochrome, 2-4% of surfactant and 1-3% of dispersant.

Further, the preparation method of the slurry pump impeller comprises the following raw materials in parts by weight: 20% of polyvinylpyrrolidone by mass; the mass part of the nano-alumina is 15 percent; 10% of nickel powder by mass; 7% of cobalt powder by mass; the molybdenum powder accounts for 8 mass percent; 8 percent of red-iron powder, 29 percent of high-carbon ferrochrome, 2 percent of surfactant and 1 percent of dispersant.

Further, the preparation method of the slurry pump impeller comprises the following raw materials in parts by weight: the mass portion of the polyvinylpyrrolidone is 18%; the mass part of the nano-alumina is 15 percent; 8% of nickel powder by mass; 6% of cobalt powder by mass; the molybdenum powder accounts for 8 mass percent; 7 mass percent of red-iron powder, 35 mass percent of high-carbon ferrochrome, 2 mass percent of surfactant and 1 mass percent of dispersant.

Further, the preparation method of the slurry pump impeller comprises the following preparation steps:

a. firstly, putting nanoscale aluminum oxide, nickel powder, cobalt powder, molybdenum powder, chromium powder and high-carbon ferrochrome into a melting furnace for heating and melting until the raw materials are completely melted into metal liquid;

b. after the step a is finished, adding polyvinylpyrrolidone, surfactant and dispersant into the metal liquid, and maintaining the temperature of a melting furnace for melting to prepare impeller metal raw material liquid;

c. after the step b is finished, pouring metal raw material liquid of the impeller into a prepared impeller mold, cooling until the impeller is completely molded, then removing the mold to take out the impeller, mechanically cutting the impeller to a required shape, and then precisely polishing the impeller to obtain the impeller;

d. after the step c is finished, soaking and cleaning the impeller by using alkali liquor, taking out the impeller, soaking the impeller in absolute ethyl alcohol, taking out the impeller and drying the impeller;

e. after the step d is finished, carrying out solid solution modification treatment on the impeller in an electric heating furnace, then introducing mixed gas of neon and nitrogen, heating to 900 ℃ at the heating rate of 0.5 ℃/s, carrying out heat preservation treatment for 50-55 min, then reducing the temperature to 350 ℃ at the cooling rate of 0.7 ℃/s, carrying out heat preservation for 45min, then continuously reducing the temperature to 65 ℃ at the same cooling rate, carrying out heat preservation, then soaking the impeller in a soaking solution at the temperature of 42 ℃, taking out the impeller after soaking for 35min, cleaning the impeller by using deionized water, and drying to constant weight;

f. and e, after the step e is finished, placing the impeller into an ion nitriding furnace, vacuumizing the air pressure in the ion nitriding furnace to 15Pa, introducing helium into the ion nitriding furnace for ion bombardment, stopping introducing the helium when the temperature in the ion nitriding furnace reaches 400-450 ℃, preserving the heat for 1.5 hours, then introducing nitrogen and hydrogen, performing low-pressure ion nitriding, adjusting the introduction pressure of the nitrogen and the hydrogen to ensure that the pressure in the ion nitriding furnace is 200-220 Pa, treating for 4 hours, naturally cooling to room temperature, and then taking out.

Further, in the step d, the impeller is soaked and cleaned by using alkali liquor, the soaking and cleaning time is 30-40 min, and the soaking and cleaning time is 5-10 min.

Further, the process conditions of the solid solution modification treatment in the step e are as follows: heating to 225 ℃ at the heating rate of 1.5 ℃/s, and keeping the temperature for 10-20 min.

Further, the steeping liquor in the step e is prepared from the following components: triethyl hexyl phosphoric acid, nitric acid, alkylphenol polyoxyethylene, a silane coupling agent, ethanol and deionized water.

Example one

The preparation method of the slurry pump impeller comprises the following raw materials in parts by weight: 20% of polyvinylpyrrolidone by mass; the mass part of the nano-alumina is 15 percent; 10% of nickel powder by mass; 7% of cobalt powder by mass; the molybdenum powder accounts for 8 mass percent; 8 percent of red-iron powder, 29 percent of high-carbon ferrochrome, 2 percent of surfactant and 1 percent of dispersant.

The preparation steps are as follows:

a. firstly, putting nanoscale aluminum oxide, nickel powder, cobalt powder, molybdenum powder, chromium powder and high-carbon ferrochrome into a melting furnace for heating and melting until the raw materials are completely melted into metal liquid;

b. after the step a is finished, adding polyvinylpyrrolidone, surfactant and dispersant into the metal liquid, and maintaining the temperature of a melting furnace for melting to prepare impeller metal raw material liquid;

c. after the step b is finished, pouring metal raw material liquid of the impeller into a prepared impeller mold, cooling until the impeller is completely molded, then removing the mold to take out the impeller, mechanically cutting the impeller to a required shape, and then precisely polishing the impeller to obtain the impeller;

d. after the step c is finished, soaking and cleaning the impeller by using alkali liquor, taking out the impeller, soaking the impeller in absolute ethyl alcohol, taking out the impeller and drying the impeller;

e. after the step d is finished, carrying out solid solution modification treatment on the impeller in an electric heating furnace, then introducing mixed gas of neon and nitrogen, heating to 900 ℃ at the heating rate of 0.5 ℃/s, carrying out heat preservation treatment for 50-55 min, then reducing the temperature to 350 ℃ at the cooling rate of 0.7 ℃/s, carrying out heat preservation for 45min, then continuously reducing the temperature to 65 ℃ at the same cooling rate, carrying out heat preservation, then soaking the impeller in a soaking solution at the temperature of 42 ℃, taking out the impeller after soaking for 35min, cleaning the impeller by using deionized water, and drying to constant weight;

f. and e, after the step e is finished, placing the impeller into an ion nitriding furnace, vacuumizing the air pressure in the ion nitriding furnace to 15Pa, introducing helium into the ion nitriding furnace for ion bombardment, stopping introducing the helium when the temperature in the ion nitriding furnace reaches 400-450 ℃, preserving the heat for 1.5 hours, then introducing nitrogen and hydrogen, performing low-pressure ion nitriding, adjusting the introduction pressure of the nitrogen and the hydrogen to ensure that the pressure in the ion nitriding furnace is 200-220 Pa, treating for 4 hours, naturally cooling to room temperature, and then taking out.

Example two

The preparation method of the slurry pump impeller comprises the following raw materials in parts by weight: the mass portion of the polyvinylpyrrolidone is 18%; the mass part of the nano-alumina is 15 percent; 8% of nickel powder by mass; 6% of cobalt powder by mass; the molybdenum powder accounts for 8 mass percent; 7 mass percent of red-iron powder, 35 mass percent of high-carbon ferrochrome, 2 mass percent of surfactant and 1 mass percent of dispersant.

The preparation steps are as follows:

a. firstly, putting nanoscale aluminum oxide, nickel powder, cobalt powder, molybdenum powder, chromium powder and high-carbon ferrochrome into a melting furnace for heating and melting until the raw materials are completely melted into metal liquid;

b. after the step a is finished, adding polyvinylpyrrolidone, surfactant and dispersant into the metal liquid, and maintaining the temperature of a melting furnace for melting to prepare impeller metal raw material liquid;

c. after the step b is finished, pouring metal raw material liquid of the impeller into a prepared impeller mold, cooling until the impeller is completely molded, then removing the mold to take out the impeller, mechanically cutting the impeller to a required shape, and then precisely polishing the impeller to obtain the impeller;

d. after the step c is finished, soaking and cleaning the impeller by using alkali liquor, taking out the impeller, soaking the impeller in absolute ethyl alcohol, taking out the impeller and drying the impeller;

e. after the step d is finished, carrying out solid solution modification treatment on the impeller in an electric heating furnace, then introducing mixed gas of neon and nitrogen, heating to 900 ℃ at the heating rate of 0.5 ℃/s, carrying out heat preservation treatment for 50-55 min, then reducing the temperature to 350 ℃ at the cooling rate of 0.7 ℃/s, carrying out heat preservation for 45min, then continuously reducing the temperature to 65 ℃ at the same cooling rate, carrying out heat preservation, then soaking the impeller in a soaking solution at the temperature of 42 ℃, taking out the impeller after soaking for 35min, cleaning the impeller by using deionized water, and drying to constant weight;

f. and e, after the step e is finished, placing the impeller into an ion nitriding furnace, vacuumizing the air pressure in the ion nitriding furnace to 15Pa, introducing helium into the ion nitriding furnace for ion bombardment, stopping introducing the helium when the temperature in the ion nitriding furnace reaches 400-450 ℃, preserving the heat for 1.5 hours, then introducing nitrogen and hydrogen, performing low-pressure ion nitriding, adjusting the introduction pressure of the nitrogen and the hydrogen to ensure that the pressure in the ion nitriding furnace is 200-220 Pa, treating for 4 hours, naturally cooling to room temperature, and then taking out.

Conventional impeller data parameters table 1 is as follows:

test items	Wear resistance	Resistance to stress cracking	Fatigue resistance performance	Service life
					Parameter index	Is poor	In general	In general	In general

Example-impeller data parameters table 2 is as follows:

test items	Wear resistance	Resistance to stress cracking	Fatigue resistance performance	Service life
					Parameter index	Is stronger	Good effect	Is stronger	Is longer

Example two-wheel data parameters table 3 is as follows:

test items	Wear resistance	Resistance to stress cracking	Fatigue resistance performance	Service life
					Parameter index	High strength	Superior food	High strength	Long and long

In conclusion, the data in tables 1, 2 and 3 are compared to obtain, and the impeller of the invention can effectively improve the organization structure of the impeller and strengthen the surface layer through surface treatment in the manufacturing process of the impeller, thereby greatly improving the components, the organization and the performance of the surface layer of the impeller, improving the surface wear resistance and the fatigue resistance of the impeller and prolonging the service life of the impeller; after the heat treatment and tempering modification treatment, the impeller coating has the advantages of highest surface microhardness, uniform coating thickness, uniform distribution, compactness and integrity, stronger bonding capability of the coating and a base material, finer internal structure grains of the impeller, obviously enhanced structure performance and capability of further improving fatigue resistance and stress cracking resistance.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.