CN111250648A - Preparation process of casting riser smooth coating - Google Patents
Preparation process of casting riser smooth coating Download PDFInfo
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- CN111250648A CN111250648A CN202010228327.XA CN202010228327A CN111250648A CN 111250648 A CN111250648 A CN 111250648A CN 202010228327 A CN202010228327 A CN 202010228327A CN 111250648 A CN111250648 A CN 111250648A
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- smooth coating
- casting riser
- casting
- powder
- graphite powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Abstract
The invention discloses a preparation process of a casting riser smooth coating, which comprises the following steps: a. uniformly mixing graphite powder and asbestos powder, then expanding graphite at the expansion temperature of 1400-1500 ℃ for 1-2min, cooling to room temperature, crushing, washing in 40-50% sulfuric acid solution, washing with water until the pH value is 6.4-6.8, drying at the temperature of 110-120 ℃ to constant weight, and crushing to obtain composite graphite powder; b. uniformly mixing the composite graphite powder with kaolin, sepiolite powder, silica gel, fly ash, ferric oxide, quartz sand and expanded perlite, and feeding the mixture into a colloid mill for grinding to obtain a prefabricated material; c. and (3) feeding the prefabricated material into a stirrer, adding water in the stirring process, standing, adding gum arabic, sodium nitrate and water glass, and continuously stirring to obtain the casting riser smooth coating.
Description
Technical Field
The invention relates to the technical field of casting risers, in particular to a preparation process of a casting riser smooth coating.
Background
In the casting production, in the casting solidification shrinkage stage, a riser is usually adopted to carry out feeding on the casting, and the application of the heating and heat-insulating riser technology is an important process measure for obtaining high-quality castings. Manufacturers producing casting auxiliary materials develop various types of heat-insulating riser sleeves to meet the development requirements of the casting industry. The riser is a supplementary part which is added above or on the side of the casting to avoid the defects of the casting, and a cavity of the riser is a cavity for storing liquid metal, so that the metal is supplied when the casting is formed, and the riser has the functions of preventing shrinkage cavity, shrinkage porosity, exhaust and slag collection.
However, most of the heating and heat-insulating riser sleeves appearing in the market are developed in a targeted manner to meet the requirements of castings and steel castings on a large scale and a molding line, but the riser sleeves are poor in surface smoothness and difficult to be satisfactorily accepted by customers.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a preparation process of a casting riser smooth coating.
A preparation process for a casting riser smooth coating comprises the following steps:
a. uniformly mixing graphite powder and asbestos powder, then expanding graphite at the expansion temperature of 1400-1500 ℃ for 1-2min, cooling to room temperature, crushing, washing in 40-50% sulfuric acid solution, washing with water until the pH value is 6.4-6.8, drying at 110-120 ℃ to constant weight, and crushing to obtain composite graphite powder
b. Uniformly mixing the composite graphite powder with kaolin, sepiolite powder, silica gel, fly ash, ferric oxide, quartz sand and expanded perlite, and feeding the mixture into a colloid mill for grinding to obtain a prefabricated material;
c. and (3) feeding the prefabricated material into a stirrer, adding water in the stirring process, standing, adding gum arabic, sodium nitrate and water glass, and continuously stirring to obtain the casting riser smooth coating.
Preferably, in the step a, the mass ratio of the graphite powder to the asbestos powder is 10: 1-4.
Preferably, in the step b, the mass ratio of the composite graphite powder, the kaolin, the sepiolite powder, the silica gel, the fly ash, the ferric oxide, the quartz sand and the expanded perlite is 2-5: 30-40: 12-20: 5-8: 2-5: 1-3: 1-3: 2-6.
Preferably, in step b, the particle size of the kaolin is 0.3 to 0.6 mm.
Preferably, in step b, the silica gel has a pH of 7.2 to 7.6.
Preferably, in step b, the iron oxide is 200-400 mesh.
Preferably, in the step c, the mass ratio of the prefabricated material to the water to the gum arabic to the sodium nitrate to the water glass is 60-80: 100-150: 1-3: 2-4: 1-5.
Preferably, in step c, the water glass has a modulus of 2.5 and a density of 1.50g/cm3。
The casting riser smooth coating is prepared by adopting the preparation process for the casting riser smooth coating.
The application method of the smooth coating for the casting riser comprises the steps of preheating the slurry of the smooth coating for the casting riser to 150-170 ℃, painting the casting riser until the thickness of the coating is 1.2-1.6mm, then preheating to 250-260 ℃, preserving heat for 10-20min, continuously heating to 400-410 ℃, preserving heat for 20-40min, and cooling to obtain the smooth casting riser coated with the coating.
According to the invention, the graphite powder is expanded at high temperature to form an effective heat conduction network chain, and the asbestos powder is uniformly dispersed in the heat conduction network chain, so that not only is the network structure of the graphite powder further enhanced, but also the embedded mesh points are formed in the expanded graphite powder grid structure, and the heat preservation effect is excellent; the composite graphite powder and the expanded perlite are matched and ground by the colloid mill, the expanded perlite can be uniformly embedded in a grid structure of the composite graphite powder and is not easy to separate, the coating is coated on the riser, the riser can keep higher temperature when the riser is used for casting, the riser is not easy to solidify, the cast liquid metal can smoothly pass through the riser and enter a die, meanwhile, the surface smoothness of the coating is extremely high, the appearance of the formed riser is full, and the quality of a casting is improved.
The coating obtained by the invention is convenient to spray, can form a uniform thin layer on the surface of the riser, has a uniform and compact coating layer, has a thickness of only 1.2mm, has excellent heat conduction and heat insulation performance, effectively protects a riser system, and has extremely smooth surface and high casting quality and forming rate.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example 1
A preparation process for a casting riser smooth coating comprises the following steps:
a. uniformly mixing 10kg of graphite powder and 1kg of anhydrous asbestos powder, feeding the mixture into a graphite expansion furnace, expanding the mixture for 1min at 1500 ℃, cooling the mixture to room temperature, crushing the mixture, feeding the mixture into a 50% sulfuric acid solution for washing, washing the mixture with water until the pH value is 6.4, drying the mixture at 120 ℃ to constant weight, and crushing the mixture to obtain composite graphite powder;
b. uniformly mixing 2kg of composite graphite powder, 40kg of kaolin with the granularity of 0.3mm, 20kg of sepiolite powder, 5kg of silica gel with the pH value of 7.6, 2kg of fly ash, 3kg of 200-mesh iron oxide, 3kg of quartz sand and 2kg of expanded perlite, and feeding the mixture into a colloid mill for grinding to obtain a prefabricated material;
c. feeding 80kg of the preform into a stirrer, adding 100kg of water while stirring, standing for 4h, adding 1kg of gum arabic, 4kg of sodium nitrate, 1kg of a compound having a modulus of 2.5 and a density of 1.50g/cm3And continuously stirring the water glass for 40min at the stirring speed of 40r/min to obtain the smooth coating for the casting riser.
The application method of the smooth coating for the casting riser comprises the steps of preheating the slurry of the smooth coating for the casting riser to 170 ℃, painting the casting riser until the thickness of the coating is 1.5mm, then preheating to 260 ℃, keeping the temperature for 10min, continuing heating to 410 ℃, keeping the temperature for 20min, and cooling to obtain the smooth casting riser coated with the coating.
Example 2
A preparation process for a casting riser smooth coating comprises the following steps:
a. uniformly mixing 10kg of graphite powder and 4kg of anhydrous asbestos powder, feeding the mixture into a graphite expansion furnace, expanding the mixture for 2min at 1400 ℃, cooling the mixture to room temperature, crushing the mixture, feeding the crushed mixture into a 40% sulfuric acid solution for washing, washing the washed mixture with water until the pH value is 6.8, drying the washed mixture at 110 ℃ to constant weight, and crushing the washed mixture to obtain composite graphite powder;
b. uniformly mixing 5kg of composite graphite powder, 30kg of kaolin with the granularity of 0.6mm, 12kg of sepiolite powder, 8kg of silica gel with the pH value of 7.2, 5kg of fly ash, 1kg of 400-mesh iron oxide, 1kg of quartz sand and 6kg of expanded perlite, and feeding the mixture into a colloid mill for grinding to obtain a prefabricated material;
c. feeding 60kg of the preform into a stirrer, adding 150kg of water during stirring, standing for 2h, adding 3kg of gum arabic, 2kg of sodium nitrate, 5kg of a mixture having a modulus of 2.5 and a density of 1.50g/cm3And continuously stirring the water glass for 20min at the stirring speed of 80r/min to obtain the smooth coating for the casting riser.
The application method of the smooth coating for the casting riser comprises the steps of preheating the slurry of the smooth coating for the casting riser to 150 ℃, painting the casting riser until the thickness of the coating is 1.6mm, then preheating to 250 ℃, keeping the temperature for 20min, continuing heating to 400 ℃, keeping the temperature for 40min, and cooling to obtain the smooth casting riser coated with the coating.
Example 3
A preparation process for a casting riser smooth coating comprises the following steps:
a. uniformly mixing 10kg of graphite powder and 2kg of anhydrous asbestos powder, feeding the mixture into a graphite expansion furnace, expanding the mixture for 1.2min at the temperature of 1480 ℃, cooling the mixture to room temperature, crushing the mixture, feeding the mixture into a 47% sulfuric acid solution for washing, washing the mixture with water until the pH value is 6.4, drying the mixture at the temperature of 118 ℃ to constant weight, and crushing the mixture to obtain composite graphite powder;
b. uniformly mixing 3kg of composite graphite powder, 37kg of kaolin with the granularity of 0.4mm, 18kg of sepiolite powder, 6kg of silica gel with the pH value of 7.5, 3kg of fly ash, 2.5kg of 250-mesh iron oxide, 2.5kg of quartz sand and 3kg of expanded perlite, and feeding the mixture into a colloid mill for grinding to obtain a prefabricated material;
c. 75kg of the preform are introduced into a stirrer, and are added during the stirringAdding 120kg water, standing for 3.5 hr, adding 1.5kg acacia, 3.5kg sodium nitrate, 2kg modulus of 2.5, and density of 1.50g/cm3And continuously stirring the water glass for 35min at the stirring speed of 60r/min to obtain the smooth coating for the casting riser.
The application method of the smooth coating for the casting riser comprises the steps of preheating the slurry of the smooth coating for the casting riser to 165 ℃, painting the casting riser until the thickness of the coating is 1.3mm, then preheating to 258 ℃, keeping the temperature for 12min, continuing heating to 408 ℃, keeping the temperature for 25min, and cooling to obtain the smooth casting riser coated with the coating.
Example 4
A preparation process for a casting riser smooth coating comprises the following steps:
a. uniformly mixing 10kg of graphite powder and 3kg of anhydrous asbestos powder, feeding the mixture into a graphite expansion furnace, expanding the mixture for 1.8min at 1420 ℃, cooling the mixture to room temperature, crushing the mixture, feeding the mixture into a 43% sulfuric acid solution for washing, washing the mixture with water until the pH value is 6.8, drying the mixture at 112 ℃ to constant weight, and crushing the mixture to obtain composite graphite powder;
b. uniformly mixing 4kg of composite graphite powder, 33kg of kaolin with the granularity of 0.5mm, 14kg of sepiolite powder, 7kg of silica gel with the pH value of 7.3, 4kg of fly ash, 1.5kg of 350-mesh iron oxide, 1.5kg of quartz sand and 5kg of expanded perlite, and feeding the mixture into a colloid mill for grinding to obtain a prefabricated material;
c. feeding 65kg of the preform into a stirrer, adding 140kg of water during stirring, standing for 2.5h, then adding 2.5kg of gum arabic, 2.5kg of sodium nitrate, 4kg of a compound having a modulus of 2.5 and a density of 1.50g/cm3And continuously stirring the water glass for 25min at the stirring speed of 70r/min to obtain the smooth coating for the casting riser.
The application method of the smooth coating for the casting riser comprises the steps of preheating the slurry of the smooth coating for the casting riser to 155 ℃, painting the casting riser until the thickness of the coating is 1.4mm, then preheating to 252 ℃, keeping the temperature for 18min, continuing heating to 402 ℃, keeping the temperature for 35min, and cooling to obtain the smooth casting riser coated with the coating.
Example 5
A preparation process for a casting riser smooth coating comprises the following steps:
a. uniformly mixing 10kg of graphite powder and 2.5kg of anhydrous asbestos powder, feeding the mixture into a graphite expansion furnace, expanding the mixture for 1.5min at 1450 ℃, cooling the mixture to room temperature, crushing the mixture, feeding the mixture into 45% sulfuric acid solution for washing, washing the mixture until the pH value is 6.4-6.8, drying the mixture at 115 ℃ to constant weight, and crushing the mixture to obtain composite graphite powder;
b. uniformly mixing 3.5kg of composite graphite powder, 35kg of kaolin with the granularity of 0.45mm, 16kg of sepiolite powder, 6.5kg of silica gel with the pH value of 7.4, 3.5kg of fly ash, 2kg of 300-mesh iron oxide, 2kg of quartz sand and 4kg of expanded perlite, and feeding the mixture into a colloid mill for grinding to obtain a prefabricated material;
c. feeding 70kg of the preform into a stirrer, adding 130kg of water during stirring, standing for 3h, adding 2kg of gum arabic, 3kg of sodium nitrate, 3kg of a mixture having a modulus of 2.5 and a density of 1.50g/cm3And continuously stirring the water glass for 30min at the stirring speed of 65r/min to obtain the smooth coating for the casting riser.
The application method of the smooth coating for the casting riser comprises the steps of preheating the slurry of the smooth coating for the casting riser to 160 ℃, painting the casting riser until the thickness of the coating is 1.2mm, then preheating to 255 ℃, keeping the temperature for 15min, continuing heating to 405 ℃, keeping the temperature for 30min, and cooling to obtain the smooth casting riser coated with the coating.
The smooth casting risers from examples 3-5 were tested and the results were as follows:
| example 3 | Example 4 | Example 5 | |
| Thickness, mm | 1.3 | 1.4 | 1.2 |
| Surface roughness (Ra), μm | 3.5 | 4.7 | 2.8 |
| Coefficient of heat transfer, W/(m)2·K) | 150 | 135 | 115 |
| Coating Strength, N/mm2 | 3.7 | 3.9 | 4.2 |
From the above results, it can be seen that: the coating obtained by the invention is convenient to spray, can form a uniform thin layer on the surface of the riser, has a uniform and compact coating layer, can be only 1.2mm in thickness, has a very smooth surface, has excellent heat conduction and heat insulation performance, effectively protects a pouring system, and ensures that the casting quality and the forming rate are high.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A preparation process for a casting riser smooth coating is characterized by comprising the following steps:
a. uniformly mixing graphite powder and asbestos powder, then expanding graphite at the expansion temperature of 1400-1500 ℃ for 1-2min, cooling to room temperature, crushing, washing in 40-50% sulfuric acid solution, washing with water until the pH value is 6.4-6.8, drying at 110-120 ℃ to constant weight, and crushing to obtain composite graphite powder
b. Uniformly mixing the composite graphite powder with kaolin, sepiolite powder, silica gel, fly ash, ferric oxide, quartz sand and expanded perlite, and feeding the mixture into a colloid mill for grinding to obtain a prefabricated material;
c. and (3) feeding the prefabricated material into a stirrer, adding water in the stirring process, standing, adding gum arabic, sodium nitrate and water glass, and continuously stirring to obtain the casting riser smooth coating.
2. The preparation process of the casting riser smooth coating according to claim 1, wherein in the step a, the mass ratio of graphite powder to asbestos powder is 10: 1-4.
3. The preparation process of the casting riser smooth coating according to claim 1, wherein in the step b, the mass ratio of the composite graphite powder, the kaolin, the sepiolite powder, the silica gel, the fly ash, the iron oxide, the quartz sand and the expanded perlite is 2-5: 30-40: 12-20: 5-8: 2-5: 1-3: 1-3: 2-6.
4. The process for preparing a casting riser smooth coating according to claim 1, wherein in the step b, the particle size of the kaolin is 0.3-0.6 mm.
5. The process of claim 1, wherein in step b, the silica gel has a pH of 7.2-7.6.
6. The process for preparing the casting riser smooth coating as claimed in claim 1, wherein in the step b, the iron oxide is 200-400 mesh.
7. The preparation process of the casting riser smooth coating according to claim 1, wherein in the step c, the mass ratio of the prefabricated material to the water to the gum arabic to the sodium nitrate to the water glass is 60-80: 100-150: 1-3: 2-4: 1-5.
8. The process for preparing a casting riser smooth coating according to claim 1, wherein in step c, the modulus of the water glass is 2.5, and the density is 1.50g/cm3。
9. A casting riser smooth coating, characterized by being prepared by the process for preparing a casting riser smooth coating according to any one of claims 1 to 8.
10. The use method of the smooth coating for the casting riser as claimed in claim 9, wherein the slurry of the smooth coating for the casting riser as claimed in claim 9 is preheated to 150-.
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