CN118007050A - Wear-resistant corrosion-resistant spraying powder and application thereof - Google Patents
Wear-resistant corrosion-resistant spraying powder and application thereof Download PDFInfo
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- CN118007050A CN118007050A CN202410136614.6A CN202410136614A CN118007050A CN 118007050 A CN118007050 A CN 118007050A CN 202410136614 A CN202410136614 A CN 202410136614A CN 118007050 A CN118007050 A CN 118007050A
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- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses wear-resistant and corrosion-resistant spraying powder which comprises 70-80% of a Ha-type alloy and 20-30% of tungsten carbide according to mass percent, wherein the particle size of the Ha-type alloy is 5-50 mu m, and the particle size of the tungsten carbide is 0.6-2 mu m. The spray powder provided by the invention has high wear resistance and high corrosion resistance, and solves the technical problems that the wear resistance and corrosion resistance of the spray powder in the prior art are poor, and the actual use requirement is difficult to meet.
Description
Technical Field
The invention relates to the technical field of injection molding screws, in particular to wear-resistant and corrosion-resistant spraying powder and application thereof.
Background
The screw plasticizing component is a main core unit of the injection molding machine, and directly reflects the performance of the injection molding machine. The screw, which is called "heart", is a critical component, and its performance determines the quality, efficiency, and other indexes of the processed product.
The common screw materials comprise No. 45 steel, 40Cr, ammoniated steel, 38CrMOAl, high-temperature alloy and the like, and the screw is easy to aggravate abrasion and corrosion and cause failure when being used for processing glass fiber products with higher hardness and flame retardant products containing corrosive components due to extremely severe use conditions of the screw. In order to improve the wear resistance and corrosion resistance of the screw, a method commonly adopted in the industry is to carry out chromium plating treatment and nitriding treatment on the surface of the screw, but the bonding strength of a plating layer obtained by the chromium plating treatment and a matrix is low, and the plating layer is easy to locally fall off in the use process, so that the plating layer is quickly worn or corroded, namely the wear resistance and corrosion resistance of the screw are difficult to ensure by adopting a chromium plating process. In addition, although the nitriding layer obtained by nitriding treatment has high bonding strength with the substrate, the surface hardness of the nitriding layer is poor, and the poor hardness means that the wear resistance is poor, and the requirements of high-speed extrusion, injection molding and processing of reinforced plastics are still difficult to meet.
In order to overcome the defect that the traditional chromium plating treatment and nitriding treatment are difficult to effectively improve the wear resistance and corrosion resistance of the screw, powder is sprayed on the surface of a screw substrate, so that a coating with high wear resistance and corrosion resistance is formed on the surface of the screw substrate, and the screw is endowed with excellent wear resistance and corrosion resistance. Because tungsten carbide has relatively good wear resistance and corrosion resistance, the spraying powder in the prior art is generally tungsten carbide or powder formed by mixing tungsten carbide serving as a main raw material with other raw materials such as NiCrMo alloy according to a certain proportion, and the coating obtained by spraying the spraying powder has better bonding strength, and the wear resistance and corrosion resistance are improved compared with those of a plating layer and a nitriding layer in the traditional treatment, but because the wear resistance and corrosion resistance of the tungsten carbide are limited, and the tungsten carbide is easy to form cracks, moisture is easy to seal in pores when the tungsten carbide is taken as a main component, hidden danger of matrix corrosion is formed, the bubbling and spalling probability of the coating is increased, the wear resistance and corrosion resistance of the coating are limited compared with those of the plating layer and the nitriding layer, and the application places with higher requirements on the wear resistance and the corrosion resistance are still difficult to meet.
Disclosure of Invention
One of the purposes of the invention is to provide a spray powder which has high wear resistance and high corrosion resistance, and solves the technical problems that the spray powder in the prior art has poor wear resistance and corrosion resistance and is difficult to meet the actual use demands.
The second purpose of the invention is to apply the wear-resistant and corrosion-resistant spraying powder to the preparation of the screw rod, so that the obtained screw rod has high wear resistance and high corrosion resistance, and the practical use requirement is met.
To achieve the purpose, the invention adopts the following technical scheme:
The wear-resistant corrosion-resistant spraying powder comprises 70-80% of a Ha-type alloy and 20-30% of tungsten carbide according to mass percentage, wherein the particle size of the Ha-type alloy is 5-50 mu m, and the particle size of the tungsten carbide is 0.6-2 mu m.
Further, the hastelloy is a C22 hastelloy.
Further, the alloy comprises 75% of C22 Ha-type alloy and 25% of tungsten carbide according to mass percentage, wherein the particle size of the C22 Ha-type alloy is 35 mu m, and the particle size of the tungsten carbide is 1 mu m.
The application of the wear-resistant and corrosion-resistant spraying powder in preparing the screw rod comprises the following steps of:
s1, carrying out heat preservation treatment on a screw to be processed in a heat treatment furnace, and cooling to room temperature;
S2, carrying out sand blasting on the surface to be sprayed of the screw to be processed until the surface to be sprayed has no metallic reflection and no oil stain;
S3, spraying the abrasion-resistant and corrosion-resistant spraying powder on the to-be-sprayed area of the screw to be processed after the surface sanding treatment, sealing the hole of the screw to be processed after the spraying is finished by using a hole sealing agent, wrapping the screw to be processed after the hole sealing treatment by using a film, and obtaining the screw with the coating after the curing treatment and the polishing treatment.
Further, in step S3, the specific method of the hole sealing treatment is as follows: cooling the screw to be processed after the spraying to 20-45 ℃, then placing the screw to be processed on a rotary bracket, and then uniformly brushing hole sealing agent on the surface of the screw to be processed by using a hairbrush in rotation;
the concrete method of the curing treatment comprises the following steps: placing the screw to be processed wrapped by the film on a rotary bracket with the rotation speed of 5-15 r/min, and curing for 24-36 h at normal temperature;
The polishing treatment method comprises the following steps: grinding the solidified screw to be processed for 5-10 min by adopting a cylindrical grinder, and polishing the screw groove by using a diamond abrasive belt.
Further, in the step S3, the thickness of the coating layer of the screw rod with the coating layer is 0.03-0.25 mm.
Further, in the step S3, the spraying process is a supersonic flame spraying process, the kerosene flow of the supersonic flame spraying process is 24-26L/h, the oxygen flow is 930-970L/min, the carrier gas flow is 7-9L/min, the spraying distance is 320-380 mm, the powder feeding amount is 50-150 g/min, and the spraying temperature is less than or equal to 120 ℃.
In step S2, the sand blasting pressure in the sand blasting step is 0.3-0.5 MPa, and the sand grain used in the sand blasting is 46# zirconia corundum or 46# white corundum.
Further, in the step S1, the heat preservation temperature in the heat preservation treatment step is 100-120 ℃, and the heat preservation time is 1.5-2 h.
Further, in the step S3, the bonding strength of the coating is more than or equal to 70MPa, the porosity is less than or equal to 0.5%, the hardness HV0.3 is more than or equal to 1000, and the roughness is less than or equal to 0.2 mu m.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
1. According to the technical scheme, the Ha-type alloy and the tungsten carbide are compounded, the proportion of the Ha-type alloy and the tungsten carbide is limited, tungsten carbide particles are dispersed and distributed, and on the premise that the coating obtained by spraying the spraying powder has good bonding strength and low porosity, the spraying powder can utilize the characteristics of high wear resistance, corrosion resistance and cost performance of the tungsten carbide, and can also utilize the excellent wear resistance and corrosion resistance of the Ha-type alloy, and the wear resistance and corrosion resistance of the spraying powder are greatly improved through the mutual matching of the two, so that the actual use requirement is met, and meanwhile, the cost performance of the spraying powder is improved. In addition, the toughness of the Ha-type alloy is high, brittle fracture is not easy to occur, the spraying powder is endowed with high toughness, and the service life of the spraying powder is prolonged.
2. The properties of the spray powder are related to the types and the proportions of the raw materials and the particle sizes of the raw materials, so the technology limits the particle sizes of the Ha-type alloy and the tungsten carbide to ensure that the obtained spray powder has high wear resistance and high corrosion resistance and meets the use places with higher requirements on the wear resistance and the corrosion resistance.
Detailed Description
The technical scheme provides wear-resistant and corrosion-resistant spraying powder which comprises 70-80% of a Ha-type alloy and 20-30% of tungsten carbide according to mass percent, wherein the particle size of the Ha-type alloy is 5-50 mu m, and the particle size of the tungsten carbide is 0.6-2 mu m.
In order to solve the technical problems that the abrasion resistance and corrosion resistance of the spraying powder in the prior art are poor and the actual use requirement is difficult to meet, the technical scheme provides the abrasion-resistant and corrosion-resistant spraying powder, which comprises a hash alloy and tungsten carbide, wherein the particle size of the hash alloy is 5-50 mu m, and the particle size of the tungsten carbide is 0.6-2 mu m.
The nickel-based alloy mainly comprises nickel, chromium, molybdenum, iron and other elements, has certain strength and oxidation corrosion resistance at the high temperature of 650-1000 ℃, and is widely applied to the fields of aviation, rocket and the like. The nickel-based alloy adopted in the prior art mainly comprises the following two types: (1) The nickel-based heat-resistant alloy has certain tensile, creep, fatigue performance, physical, chemical and technological properties at high temperature, but has limited wear resistance and corrosion resistance, belongs to low wear resistance and low corrosion resistance alloy, and can only meet the use requirement of low wear resistance and corrosion resistance; (2) Nickel-based wear-resistant alloy has good wear resistance, but half of the corrosion resistance is difficult to meet the use requirements of high wear resistance and corrosion resistance. In order to improve the wear resistance and corrosion resistance of the spray powder, the special nickel-based corrosion resistant alloy, such as the Hatype alloy, is particularly preferred to be added into a formula, compared with the nickel-based heat resistant alloy and the nickel-based wear resistant alloy, the Hatype alloy has extremely low silicon content and carbon content, and the extremely low silicon content and carbon content enable the Hastelloy to have excellent pitting corrosion resistance, crevice corrosion resistance and stress corrosion resistance. Meanwhile, the higher molybdenum content and chromium content in the hastelloy can enable the hastelloy to resist chloride ion corrosion, and the tungsten element further improves corrosion resistance, so that the hastelloy can be used in various strong acid environments. In addition, the hastelloy has extremely high hardness, excellent wear resistance, excellent plasticity and toughness, and stable performance under high-temperature and high-pressure conditions, so that the spray powder prepared by the hastelloy has excellent toughness and is not easy to generate brittle fracture.
Further, tungsten carbide is a compound composed of tungsten and carbon, is a black hexagonal crystal, has high hardness, wear resistance and corrosion resistance, and can not only improve the wear resistance of a screw rod by 4-7 times when being used for treating the surface of the screw rod, but also improve the corrosion resistance of a metal material, thereby prolonging the service life of the screw rod.
Further, according to the mass percentage, the spraying powder in the technical scheme comprises 70-80% of the hashtag and 20-30% of the tungsten carbide, when the adding amount of the hashtag is less than 70%, the hashtag is used as a binding phase, tungsten carbide particles are difficult to disperse, the bonding strength of a coating obtained by using the spraying powder is reduced, the porosity of the coating obtained by using the spraying powder is larger, the compactness of the coating is poor due to the larger porosity, and therefore the wear resistance and corrosion resistance of the coating are reduced, namely, when the adding amount of the hashtag is less than 70%, the spraying powder cannot meet the use requirement. When the addition amount of the hastelloy is more than 80%, the hardness of the coating obtained by using the spraying powder is reduced, and the reduction of the hardness means that the wear resistance of the coating is reduced, and the spraying powder cannot meet the actual use requirement.
Therefore, the spraying powder in the prior art is generally tungsten carbide or powder formed by mixing tungsten carbide serving as a main raw material with other raw materials such as NiCrMo alloy according to a certain proportion, and the coating obtained by spraying the spraying powder has better bonding strength, and has higher wear resistance and corrosion resistance than a plating layer and a nitriding layer in the traditional treatment, but still is difficult to meet the use places with higher requirements on wear resistance and corrosion resistance.
According to the technical scheme, the Ha-type alloy and the tungsten carbide are compounded, the proportion of the Ha-type alloy and the tungsten carbide is limited, tungsten carbide particles are dispersed and distributed, and on the premise that the coating obtained by spraying the spraying powder has good bonding strength and low porosity, the spraying powder can utilize the characteristics of high wear resistance, corrosion resistance and cost performance of the tungsten carbide, and can also utilize the excellent wear resistance and corrosion resistance of the Ha-type alloy, and the wear resistance and corrosion resistance of the spraying powder are greatly improved through the mutual matching of the two, so that the actual use requirement is met, and meanwhile, the cost performance of the spraying powder is improved. In addition, the toughness of the Ha-type alloy is high, brittle fracture is not easy to occur, the spraying powder is endowed with high toughness, and the service life of the spraying powder is prolonged.
Furthermore, the properties of the spray powder are related to the types and proportions of the raw materials and the particle sizes of the raw materials, so that the particle sizes of the Ha-type alloy and the particle sizes of the tungsten carbide are limited by the technology, the spray powder is ensured to have high wear resistance and high corrosion resistance, and the application places with higher requirements on the wear resistance and the corrosion resistance are met.
Specifically, when the grain size of the hastelloy is smaller than 5 μm, the fluidity of the spray powder is poor, the spray effect is poor, the wear resistance and corrosion resistance are affected, and the manufacturing cost of the spray powder is also excessively high; when the grain diameter of the Ha-type alloy is larger than 50 mu m, unmelted phenomenon is easy to occur in the spraying process of the spraying powder, unmelted particles are easy to occur in the coating, the spraying effect is poor, and the wear resistance and the corrosion resistance are difficult to ensure. Therefore, the grain diameter of the Ha-type alloy is limited to 5-50 mu m in the technical scheme, so that the Ha-type alloy is ensured to be sufficiently melted in the spraying process, and the wear resistance and corrosion resistance of spraying powder are ensured.
Meanwhile, the existing pulverizing technology divides tungsten carbide into three types, wherein 0.6-1 mu m is small-particle-size tungsten carbide, 1-2 mu m is medium-particle-size tungsten carbide, and more than 2 mu m is large-particle-size tungsten carbide. And as the tungsten carbide with large particle size is larger in particle size, excessive porosity is easy to generate, so that the porosity of the prepared spray powder is too large, and the wear resistance and corrosion resistance of the spray powder are affected. Therefore, in the technical scheme, the particle size of the tungsten carbide is 0.6-2 mu m, namely the technical scheme adopts the tungsten carbide with medium particle size and the tungsten carbide with small particle size as raw materials to be mixed, so that the spray powder with high wear resistance and high corrosion resistance is obtained at lower cost.
Further illustratively, the hastelloy is a C22 hastelloy.
The C22 Ha-type alloy comprises the following components in percentage by mass: less than or equal to 0.015 percent of C, less than or equal to 0.008 percent of Si, less than or equal to 0.050 percent of Mn, 20.0 to 22.5 percent of Cr, 12.5 to 14.5 percent of Mo, less than or equal to 2.5 percent of Co, 2.5 to 23.5 percent of W and the balance of Ni. The reasonable collocation of the elements ensures that the C22 hastelloy has more excellent corrosion resistance and wear resistance compared with other hastelloy, and simultaneously ensures that the C22 hastelloy has better toughness, so that brittle fracture is not easy to occur, and the performance of the C22 hastelloy is ensured. Thus, in a preferred embodiment of the present solution, the hashtag is defined as a C22 hashtag, which is advantageous for improving the wear and corrosion resistance of the spray powder.
Further illustratively, the alloy comprises 75% by mass of C22 Ha-type alloy and 25% by mass of tungsten carbide, wherein the particle size of the C22 Ha-type alloy is 35 μm and the particle size of the tungsten carbide is 1 μm.
In a preferred embodiment of the technical scheme, the addition proportion of the C22 Ha-type alloy and the tungsten carbide and the particle size of the C22 Ha-type alloy and the tungsten carbide are limited, so that high-performance spraying powder is obtained at lower cost, and the wear resistance, corrosion resistance and cost performance of the spraying powder are optimized.
The application of the wear-resistant and corrosion-resistant spraying powder in preparing the screw rod comprises the following steps of:
s1, carrying out heat preservation treatment on a screw to be processed in a heat treatment furnace, and cooling to room temperature;
S2, carrying out sand blasting on the surface to be sprayed of the screw to be processed until the surface to be sprayed has no metallic reflection and no oil stain;
S3, spraying the abrasion-resistant and corrosion-resistant spraying powder on the to-be-sprayed area of the screw to be processed after the surface sanding treatment, sealing the hole of the screw to be processed after the spraying is finished by using a hole sealing agent, wrapping the screw to be processed after the hole sealing treatment by using a film, and obtaining the screw with the coating after the curing treatment and the polishing treatment.
The technical scheme also provides application of the wear-resistant and corrosion-resistant spraying powder in preparing the screw, which comprises the following steps:
S1, after the screw to be processed is subjected to heat preservation treatment in a heat treatment furnace, cooling the screw to be processed to room temperature, so that stress is removed before spraying, and bending of the screw to be processed due to stress release in a spraying process and a subsequent process is avoided.
S2, carrying out sand blasting on the surface to be sprayed of the screw to be processed until the surface to be sprayed is free of metallic reflection and oil stains, so that the surface of the screw to be processed is clean, meanwhile, the roughness of the surface of the screw to be processed can be increased, the contact area between a coating and the screw to be processed is increased, the adhesiveness between the coating and the screw to be processed is increased, and the screw after processing is high in wear resistance and corrosion resistance.
S3, spraying abrasion-resistant and corrosion-resistant spraying powder on a to-be-sprayed area of the screw to be processed after the surface sanding treatment, sealing the sprayed screw to be processed by using a hole sealing agent, and wrapping the screw to be processed by using a film, so that on one hand, the penetration depth of the hole sealing agent can be increased, on the other hand, the hole sealing agent can be enabled to be in contact with moisture in the air as little as possible in the penetration process, the moisture is prevented from being sealed inside a hole, hidden danger of matrix corrosion is formed, the bubbling and peeling probability of a coating is increased, and meanwhile, the moisture or dew causes acidification of the hole sealing agent, so that the hole sealing agent also has corrosion performance and cannot be used. And then, the screw rod with the coating is obtained after the curing treatment and the polishing treatment, the preparation method is simple, the operability is strong, and the prepared screw rod has high wear resistance and corrosion resistance, and can be used under extremely severe working conditions so as to meet the actual use requirements.
The manufacturer of the sealing agent is Dalianyi technology Co., ltd, and the brand is Diamant 1532 sealing agent.
Further described, in step S3, the specific method of the hole sealing treatment is as follows: cooling the screw to be processed after the spraying to 20-45 ℃, then placing the screw to be processed on a rotary bracket, and then uniformly brushing hole sealing agent on the surface of the screw to be processed by using a hairbrush in rotation;
the concrete method of the curing treatment comprises the following steps: placing the screw to be processed wrapped by the film on a rotary bracket with the rotation speed of 5-15 r/min, and curing for 24-36 h at normal temperature;
The polishing treatment method comprises the following steps: grinding the solidified screw to be processed for 5-10 min by adopting a cylindrical grinder, and polishing the screw groove by using a diamond abrasive belt.
In a preferred embodiment of the present technical solution, the specific method of hole sealing treatment is as follows: and cooling the screw to be processed after the spraying is finished to 20-45 ℃, placing the screw to be processed on a rotary bracket, then uniformly brushing the hole sealing agent on the surface of the screw to be processed by using a hairbrush in rotation, penetrating the hole sealing agent into the micropores of the coating, sealing the micropores of the coating after solidification, avoiding corrosive components from entering the coating through the micropores, and ensuring the corrosion resistance of the coating.
Further, the temperature of the screw to be processed in hole sealing treatment is controlled to be 20-45 ℃, and the permeability of the hole sealing agent is increased under the condition that the surface energy of the hole sealing agent is minimum, so that the depth of a permeable layer of the hole sealing agent is improved, and the corrosion resistance of the screw is improved.
Further, the concrete method of the curing treatment is as follows: and (3) placing the screw to be processed wrapped by the film on a rotary bracket with the rotation speed of 5-15 r/min, and curing for 24-36 hours at normal temperature, so that the hole sealing agent can be fully cured, the hole sealing performance is ensured, and further the wear resistance and corrosion resistance of the screw are ensured. In addition, the rotation speed is limited to be 5-15 r/min, so that the hole sealing agent can uniformly permeate each surface of the screw to be processed, and meanwhile, the centrifugal force throwing effect can not occur, and the hole sealing effect is ensured.
Further, the polishing treatment method comprises the following steps: and grinding the cured screw to be processed by adopting a cylindrical grinding machine, polishing a screw groove by using a diamond abrasive belt, ensuring the roughness of the screw, ensuring that the prepared screw is not easy to be sticky and discolored, and having good injection molding smoothness.
Further, in the step S3, the thickness of the coating layer of the coated screw is 0.03 to 0.25mm.
The thickness of the coating influences the wear resistance and corrosion resistance of the screw, and the screw has different requirements on the thickness of the coating according to different actual use requirements, and 0.03mm is used as the lower limit of the thickness of the coating, so that the screw is suitable for the use requirements of good working conditions and strict cost control; the upper limit of the thickness of the coating is 0.25mm, and the coating is suitable for the use requirements of severe working conditions and loose cost control. Therefore, the technical scheme limits the thickness of the coating of the screw rod with the coating to 0.03-0.25 mm so as to meet different practical use requirements.
Further illustrated, in the step S3, the spraying process is a supersonic flame spraying process, the kerosene flow of the supersonic flame spraying process is 24-26L/h, the oxygen flow is 930-970L/min, the carrier gas flow is 7-9L/min, the spraying distance is 320-380 mm, the powder feeding amount is 50-150 g/min, and the spraying temperature is less than or equal to 120 ℃.
The working principle of the supersonic flame spraying process is as follows: liquid entering the combustion chamber from the small holes burns, such as kerosene, and is atomized, mixed with oxygen and ignited to produce strong gas phase reaction, and the heat energy produced by the combustion makes the product expand violently. The flame flow heats the spray powder particles to a molten state and sprays them onto the substrate surface to obtain a coating. Compared with a laser cladding spraying process and a flame remelting spraying process, the coating obtained by the supersonic flame spraying process has higher bonding strength and higher compactness and hardness, so that the prepared screw has better wear resistance and corrosion resistance, and the screw to be processed receives little heat in the spraying process and is not easy to deform.
Further, in the step S2, the sand blasting pressure in the sand blasting step is 0.3 to 0.5MPa, and the sand grain used in the sand blasting is 46# zirconia corundum or 46# white corundum.
When the sand blasting pressure is larger than 0.5MPa, the sand blasting pressure is too large, so that the roughness is too large, the surface finish of the screw after sand blasting is too poor, and the uniformity of spray powder coating is affected; when the sand blasting pressure is less than 0.3MPa, the paint is not easy to purify and roughen to the required roughness, and the bonding strength of the coating and the screw substrate is affected. Therefore, in a preferred embodiment of the present technical solution, the blasting pressure in the blasting step is limited to 0.3-0.5 MPa, so that the surface of the screw after the blasting is cleaned and burr-free, and the screw has a certain roughness, which is beneficial to ensuring the bonding strength with the coating.
Further, the 46# zirconia corundum is prepared by smelting alumina and zirconia serving as raw materials at a high temperature of more than 2000 ℃ in an electric arc furnace, and comprises the following chemical components by mass percent, 10-40% of zirconia and 60-90% of alumina; the No. 46 white corundum is prepared by taking aluminum oxide as a raw material and carrying out electrofusion refining crystallization, wherein the chemical components of the No. 46 white corundum comprise more than or equal to 98% of ferric oxide and silicon dioxide according to mass percent, and the balance of the No. 46 white corundum is ferric oxide and silicon dioxide.
In a preferred embodiment of the present technical solution, the sand grain used in the sand blasting treatment is 46# zirconia corundum or 46# white corundum, so that the surface of the screw to be processed is clean, and the surface roughness of the screw to be processed is increased, and the contact area between the coating and the screw to be processed is increased, so that the adhesion between the coating and the screw to be processed is increased, and the screw after the processing has high wear resistance and high corrosion resistance.
Further, in the step S1, the heat preservation temperature in the heat preservation treatment step is 100-120 ℃, and the heat preservation time is 1.5-2 h.
In a preferred embodiment of the technical scheme, the heat preservation temperature is limited to 100-120 ℃, and the heat preservation time is limited to 1.5-2 hours, so that the screw to be processed is more beneficial to removing stress before spraying, and bending of the screw due to stress release in the spraying process and the subsequent process is avoided.
Further described, in the step S3, the bonding strength of the coating is more than or equal to 70MPa, the porosity is less than or equal to 0.5%, the hardness HV 0.3 is more than or equal to 1000, and the roughness is less than or equal to 0.2 mu m.
In a preferred embodiment of the present technical solution, the bonding strength characterizes the bonding firmness of the coating and the substrate, so that the coating is ensured not to fall off under a larger shearing force of the coating; the smaller the clearance rate of the coating hole is, the higher the coating compactness is, and the higher the corrosion resistance and the wear resistance of the coating are; the higher the hardness of the coating, the higher the wear resistance of the coating; the smaller the surface roughness of the screw, the less likely it is to cause sticking and discoloration, and the better the injection molding smoothness. Therefore, in a preferred embodiment of the technical scheme, the bonding strength of the coating is more than or equal to 70MPa, the porosity is less than or equal to 0.5%, the hardness HV 0.3 is more than or equal to 1000, and the roughness is less than or equal to 0.2 mu m, so that the screw is more beneficial to having high wear resistance and high corrosion resistance so as to meet the actual use requirements.
Performance test:
1. Thickness measurement: the coating thickness was measured according to the experimental method of GB/T6462-2005 metal and oxide coating thickness measurement microscopy.
2. Binding strength determination: the coating bond strength was tested according to the test method of astm c633-2001 standard test for adhesion or bond strength of thermal spray coatings.
3. Porosity measurement: the porosity of the coating was determined according to the experimental method of ASTM E2019-2014, standard experimental method for determining the area percent porosity of thermal spray coatings.
4. Hardness measurement: according to GB/T4340.1-2009 Vickers hardness test section 1: test methods the hardness of the coating was determined by the experimental method of test methods.
5. Roughness measurement: according to section 4 of steel surface roughness characteristics after spray cleaning of steel surface treatment before coating of GB/T13288.4-2013: calibration of ISO surface roughness comparison sample and measurement of surface roughness the coating roughness was measured by the experimental method of stylus method.
6. And (3) measuring the service life of the screw: the screw was used to process a glass fiber product containing 60% glass fibers, and the service life thereof was measured.
Group of examples
Example 1
S1, carrying out heat preservation treatment on a screw to be processed in a heat treatment furnace at 100 ℃ for 1.5 hours, and cooling to room temperature;
S2, carrying out sand blasting on the surface to be sprayed of the screw to be processed until the surface to be sprayed has no metallic reflection and no oil stain; wherein the sand blasting pressure in the sand blasting step is 0.4MPa, and sand grains used in the sand blasting are 46# zirconia corundum;
s3, spraying wear-resistant and corrosion-resistant spraying powder on a to-be-sprayed area of the screw to be processed subjected to surface sanding treatment, sealing the sprayed screw to be processed by using a hole sealing agent, wrapping the screw to be processed subjected to hole sealing treatment by using a film, and obtaining a screw with a coating after curing treatment and polishing treatment; wherein, according to the mass percentage, the wear-resistant and corrosion-resistant spraying powder comprises 70 percent of C22 Ha-type alloy and 30 percent of tungsten carbide, the grain diameter of the C22 Ha-type alloy is 5 mu m, and the grain diameter of the tungsten carbide is 0.6 mu m; the spraying process is a supersonic flame spraying process, the kerosene flow of the supersonic flame spraying process is 24L/h, the oxygen flow is 930L/min, the carrier gas flow is 7L/min, the spraying distance is 320mm, the powder feeding amount is 50g/min, and the spraying temperature is 120 ℃; the specific method for hole sealing treatment comprises the following steps: cooling the screw to be processed after the spraying is finished to 20 ℃, then placing the screw to be processed on a rotary bracket, and then uniformly brushing the hole sealing agent on the surface of the screw to be processed by using a hairbrush in the rotation; wherein, the manufacturer of the hole sealing agent is Dalianyi technology limited company, and the brand is Diamant 1532 hole sealing agent; the concrete method of the curing treatment is as follows: placing the screw to be processed wrapped by the film on a rotating bracket with the rotating speed of 5r/min, and curing for 24 hours at normal temperature; the polishing treatment method comprises the following steps: grinding the solidified screw to be processed for 8min by adopting a cylindrical grinder, and polishing the screw groove by using a diamond abrasive belt.
Example 2
S1, carrying out heat preservation treatment on a screw to be processed in a heat treatment furnace at 110 ℃ for 2 hours, and cooling to room temperature;
S2, carrying out sand blasting on the surface to be sprayed of the screw to be processed until the surface to be sprayed has no metallic reflection and no oil stain; wherein the sand blasting pressure in the sand blasting step is 0.3MPa, and sand grains used in the sand blasting are 46# zirconia corundum;
s3, spraying wear-resistant and corrosion-resistant spraying powder on a to-be-sprayed area of the screw to be processed subjected to surface sanding treatment, sealing the sprayed screw to be processed by using a hole sealing agent, wrapping the screw to be processed subjected to hole sealing treatment by using a film, and obtaining a screw with a coating after curing treatment and polishing treatment; wherein, according to the mass percentage, the wear-resistant and corrosion-resistant spraying powder comprises 75 percent of C22 Ha-type alloy and 25 percent of tungsten carbide, the grain diameter of the C22 Ha-type alloy is 35 mu m, and the grain diameter of the tungsten carbide is 1 mu m; the spraying process is a supersonic flame spraying process, the kerosene flow of the supersonic flame spraying process is 26L/h, the oxygen flow is 970L/min, the carrier gas flow is 9L/min, the spraying distance is 380mm, the powder feeding amount is 150g/min, and the spraying temperature is 120 ℃; the specific method for hole sealing treatment comprises the following steps: cooling the screw to be processed after the spraying is finished to 30 ℃, then placing the screw to be processed on a rotary bracket, and then uniformly brushing the hole sealing agent on the surface of the screw to be processed by using a hairbrush in the rotation; wherein, the manufacturer of the hole sealing agent is Dalianyi technology limited company, and the brand is Diamant 1532 hole sealing agent; the concrete method of the curing treatment is as follows: placing the screw to be processed wrapped by the film on a rotary bracket with the rotation speed of 15r/min, and curing for 30 hours at normal temperature; the polishing treatment method comprises the following steps: grinding the solidified screw to be processed for 10min by adopting a cylindrical grinder, and polishing the screw groove by using a diamond abrasive belt.
Example 3
S1, carrying out heat preservation treatment on a screw to be processed in a heat treatment furnace at 120 ℃ for 1.8 hours, and cooling to room temperature;
S2, carrying out sand blasting on the surface to be sprayed of the screw to be processed until the surface to be sprayed has no metallic reflection and no oil stain; wherein the sand blasting pressure in the sand blasting step is 0.5MPa, and sand grains used in the sand blasting are 46# zirconia corundum;
S3, spraying wear-resistant and corrosion-resistant spraying powder on a to-be-sprayed area of the screw to be processed subjected to surface sanding treatment, sealing the sprayed screw to be processed by using a hole sealing agent, wrapping the screw to be processed subjected to hole sealing treatment by using a film, and obtaining a screw with a coating after curing treatment and polishing treatment; ; wherein, according to the mass percentage, the wear-resistant and corrosion-resistant spraying powder comprises 80 percent of C22 Ha-type alloy and 20 percent of tungsten carbide, the grain diameter of the C22 Ha-type alloy is 50 mu m, and the grain diameter of the tungsten carbide is 2 mu m; the spraying process is a supersonic flame spraying process, the kerosene flow of the supersonic flame spraying process is 25L/h, the oxygen flow is 950L/min, the carrier gas flow is 8L/min, the spraying distance is 350mm, the powder feeding amount is 100g/min, and the spraying temperature is 100 ℃; the specific method for hole sealing treatment comprises the following steps: cooling the screw to be processed after the spraying is finished to 30 ℃, then placing the screw to be processed on a rotary bracket, and then uniformly brushing the hole sealing agent on the surface of the screw to be processed by using a hairbrush in the rotation; wherein, the manufacturer of the hole sealing agent is Dalianyi technology limited company, and the brand is Diamant 1532 hole sealing agent; the concrete method of the curing treatment is as follows: placing the screw to be processed wrapped by the film on a rotary bracket with the rotation speed of 10r/min, and curing for 36h at normal temperature; the polishing treatment method comprises the following steps: grinding the solidified screw to be processed for 10min by adopting a cylindrical grinder, and polishing the screw groove by using a diamond abrasive belt.
Comparative example group
Comparative example 1
The method of application of comparative example 1 was the same as in example 2, except that comparative example 1 included 65% by mass of C22 Ha-type alloy and 35% by mass of tungsten carbide.
Comparative example 2
The raw material formulation and application method of comparative example 2 were the same as in example 2, except that the particle size of the C22 Ha-type alloy in comparative example 2 was 55. Mu.m.
Comparative example 3
The raw material formulation and the application method of comparative example 3 were the same as in example 2, except that the particle size of tungsten carbide in comparative example 3 was 2.2. Mu.m.
Comparative example 4
The method of application of comparative example 4 was the same as in example 2, except that the formulation of the spray powder in comparative example 4 was different from the abrasion-resistant and corrosion-resistant spray powder in example 2, specifically: the spray powder comprises 85% and 15% of tungsten carbide and 15% of NiCrMo alloy, wherein the particle size of the 15% of NiCrMo alloy is 35 mu m, and the particle size of the tungsten carbide is 1 mu m.
The screws obtained in the above example group and comparative example group were subjected to performance tests, and specific test results are shown in table 1 below:
TABLE 1 screw related Performance test results
The screw working condition is extremely complex and difficult to simulate and has no corresponding standard; the existing wear resistance test and corrosion resistance test are far away from the actual working condition of the screw rod and cannot be referred to. Therefore, the technical scheme reflects the wear resistance and corrosion resistance of the prepared screw with the coating from the hardness of the coating, the bonding strength of the coating and the service life. As shown in the test results of Table 1, the coating obtained by the application method of the technical scheme has the bonding strength of more than or equal to 70MPa, the porosity of less than or equal to 0.5%, the hardness HV 0.3 of more than or equal to 1000 and the roughness of less than or equal to 0.2 mu m, and the hardness is closely related to the wear resistance of the coating, and the higher the hardness is, the stronger the wear resistance is; meanwhile, the smaller the porosity is, the higher the compactness of the coating is, and the higher the corrosion resistance and the wear resistance of the coating are. Therefore, the coating obtained by the technical scheme has higher wear resistance and corrosion resistance, thereby being beneficial to prolonging the service life of the screw rod with the coating, leading the service life to be longer than 25 months even when the screw rod is used for processing glass fiber products containing 60 percent of glass fibers, and greatly improving the service life compared with the screw rod to be processed without any treatment.
Comparative example 1 since the ratio of C22 hashtag and tungsten carbide is not within the range of the present example, the hardness of the coating layer is decreased and the porosity is increased, and the hardness is closely related to the wear resistance of the coating layer, the lower the hardness is, the worse the wear resistance is; the greater the porosity, the poorer the coating density, and the poorer the corrosion and wear resistance of the coating. Therefore, the reduced hardness and increased porosity of the coating reduce both the wear resistance and corrosion resistance of the coating, thereby making the screw with the coating shorter in service life.
Comparative example 2 because the particle size of the C22 hashtag was too large, unmelted particles easily appeared in the coating during the spray-coating of the spray powder, and the spray effect was deteriorated, resulting in a decrease in the hardness and an increase in the porosity of the coating, thereby decreasing both the wear resistance and corrosion resistance of the coating, and further making the screw having the above-mentioned coating shorter in service life.
In comparative example 3, the particle size of tungsten carbide is too large, so that the porosity of the prepared spray powder is too large, the hardness of the coating is reduced, the porosity is increased, the wear resistance and corrosion resistance of the coating are reduced, and the service life of the screw with the coating is shortened.
In comparative example 4, although the hardness of the obtained coating was high, the addition amount of tungsten carbide was too large, and since tungsten carbide was liable to form cracks, moisture was liable to be enclosed in the pores, forming a hidden trouble of corrosion of the matrix, increasing the probability of bubbling and peeling of the coating, and decreasing the wear resistance and corrosion resistance thereof, thereby shortening the service life of the screw having the above coating.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (10)
1. The wear-resistant corrosion-resistant spraying powder is characterized by comprising 70-80% of a Ha-type alloy and 20-30% of tungsten carbide according to mass percentage, wherein the particle size of the Ha-type alloy is 5-50 mu m, and the particle size of the tungsten carbide is 0.6-2 mu m.
2. A wear-resistant and corrosion-resistant spray powder as claimed in claim 1, wherein: the Ha-type alloy is C22 Ha-type alloy.
3. A wear-resistant and corrosion-resistant spray powder as claimed in claim 2, wherein: according to mass percentage, the alloy comprises 75% of C22 Ha-type alloy and 25% of tungsten carbide, wherein the particle size of the C22 Ha-type alloy is 35 mu m, and the particle size of the tungsten carbide is 1 mu m.
4. Use of a wear-resistant and corrosion-resistant spray powder according to any one of claims 1 to 3 for the preparation of a screw, comprising the steps of:
s1, carrying out heat preservation treatment on a screw to be processed in a heat treatment furnace, and cooling to room temperature;
S2, carrying out sand blasting on the surface to be sprayed of the screw to be processed until the surface to be sprayed has no metallic reflection and no oil stain;
S3, spraying the abrasion-resistant and corrosion-resistant spraying powder on the to-be-sprayed area of the screw to be processed after the surface sanding treatment, sealing the hole of the screw to be processed after the spraying is finished by using a hole sealing agent, wrapping the screw to be processed after the hole sealing treatment by using a film, and obtaining the screw with the coating after the curing treatment and the polishing treatment.
5. The use of a wear-resistant and corrosion-resistant spray powder according to claim 4 for the preparation of screws, characterized in that: in step S3, the specific method of the hole sealing treatment is as follows: cooling the screw to be processed after the spraying to 20-45 ℃, then placing the screw to be processed on a rotary bracket, and then uniformly brushing hole sealing agent on the surface of the screw to be processed by using a hairbrush in rotation;
the concrete method of the curing treatment comprises the following steps: placing the screw to be processed wrapped by the film on a rotary bracket with the rotation speed of 5-15 r/min, and curing for 24-36 h at normal temperature;
The polishing treatment method comprises the following steps: grinding the solidified screw to be processed for 5-10 min by adopting a cylindrical grinder, and polishing the screw groove by using a diamond abrasive belt.
6. The use of a wear-resistant and corrosion-resistant spray powder according to claim 4 for the preparation of screws, characterized in that: in the step S3, the thickness of the coating layer of the screw rod with the coating layer is 0.03-0.25 mm.
7. The use of a wear-resistant and corrosion-resistant spray powder according to claim 4 for the preparation of screws, characterized in that: in the step S3, the spraying process is a supersonic flame spraying process, the kerosene flow of the supersonic flame spraying process is 24-26L/h, the oxygen flow is 930-970L/min, the carrier gas flow is 7-9L/min, the spraying distance is 320-380 mm, the powder feeding amount is 50-150 g/min, and the spraying temperature is less than or equal to 120 ℃.
8. The use of a wear-resistant and corrosion-resistant spray powder according to claim 4 for the preparation of screws, characterized in that: in the step S2, the sand blasting pressure in the sand blasting step is 0.3-0.5 MPa, and sand grains used in the sand blasting are 46# zirconia corundum or 46# white corundum.
9. The use of a wear-resistant and corrosion-resistant spray powder according to claim 4 for the preparation of screws, characterized in that: in the step S1, the heat preservation temperature in the heat preservation treatment step is 100-120 ℃, and the heat preservation time is 1.5-2 h.
10. The use of a wear-resistant and corrosion-resistant spray powder according to claim 4 for the preparation of screws, characterized in that: in the step S3, the bonding strength of the coating is more than or equal to 70MPa, the porosity is less than or equal to 0.5%, the hardness HV 0.3 is more than or equal to 1000, and the roughness is less than or equal to 0.2 mu m.
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