CN114101593B - High-collapsibility recyclable silica-based ceramic core and preparation method and application thereof - Google Patents
High-collapsibility recyclable silica-based ceramic core and preparation method and application thereof Download PDFInfo
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- CN114101593B CN114101593B CN202111426025.4A CN202111426025A CN114101593B CN 114101593 B CN114101593 B CN 114101593B CN 202111426025 A CN202111426025 A CN 202111426025A CN 114101593 B CN114101593 B CN 114101593B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
- B22C1/188—Alkali metal silicates
Abstract
The invention provides a high-collapsibility recyclable silica-based ceramic core, and a preparation method and application thereof, wherein the preparation raw materials comprise: quartz glass basic powder, water glass, pore-forming agent, additive and water; the quartz glass base powder is prepared from 10-75% of nano-scale silicon dioxide and 25-90% of micron-scale silicon dioxide by mass percent, wherein the nano-scale silicon dioxide and the micron-scale silicon dioxide are subjected to particle grading; the additive is ceramic powder for inhibiting sintering densification of quartz glass base powder; the addition amounts of the water glass, the pore-forming agent, the additive and the water are respectively 1-8%, 0-15%, 0-40% and 5-15% of the mass of the quartz glass base powder. The ceramic core is directly preheated and poured without degreasing or dewaxing, has high collapsibility and can be directly removed by a physical vibration mode; and the stripped ceramic core can realize 100% recycling.
Description
Technical Field
The invention relates to the field of precision casting, in particular to a high-collapsibility recyclable silica-based ceramic core, and a preparation method and application thereof.
Background
The ceramic core has wide application in the precision casting fields of aviation industry turbine engine hollow blades, marine high-thrust engine hollow blades, golf heads, large thin-wall aluminum alloy castings, impellers for chemical industry and the like. Ceramic cores commonly used at home and abroad are mainly classified into silicon-based ceramic cores and aluminum-based ceramic cores according to a base material. The matrix material of the silicon-based ceramic core is quartz glass powder, zircon, mullite or rare earth oxide is added as mineralizer, and the content of cristobalite generated in the sintering process is controlled, so that the core has good physical and mechanical properties, small thermal expansion coefficient and good fire resistance, is easily dissolved in molten alkali and hydrofluoric acid, and is convenient to take off, therefore, the research is the most, the application is the most extensive, and the technology is the most mature at present.
At present, the precise silicon-based ceramic core has a plurality of defects, and needs to be solved. Firstly, injection molding or slip casting is usually adopted in the molding mode, so that a wax base or organic lipid is added in the formula to serve as a binder, a long-time degreasing or dewaxing process is needed in the sintering process, the production period is long, the shrinkage rate in the dewaxing process is high, and the size of the core is difficult to control accurately; in recent years, water-based adhesives have been widely used, but the blanks thereof have high water content, require evaporation of a large amount of water, have large drying heat consumption, have many defects such as deformation and cracking, and also require addition of an organic polymer. Secondly, the mold cores are required to be removed in chemical modes such as alkali boiling after pouring, and the VOCs and solid waste discharge are amplified, so that the environment friendliness is poor and the degree of automation is low; in addition, the core after collapse is difficult to recycle due to the residue of wax base or organic lipid, and the production cost is high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a high-collapsibility recyclable silica-based ceramic core, a preparation method and application thereof, wherein the ceramic core has the advantages of high drying and hardening speed, small shrinkage deformation and higher dimensional accuracy; the preheating and pouring are directly carried out without degreasing or dewaxing, so that the production period is greatly shortened; the ceramic core has high collapsibility and can be directly removed in a physical vibration mode; and the stripped ceramic core can realize 100% recycling.
The invention is realized by the following technical scheme:
a high-collapsibility recyclable silica-based ceramic core is prepared from the following raw materials: quartz glass basic powder, water glass, pore-forming agent, additive and water;
the quartz glass base powder is prepared from 10-75% of nano-scale silicon dioxide and 25-90% of micron-scale silicon dioxide by mass percent, wherein the nano-scale silicon dioxide and the micron-scale silicon dioxide are subjected to particle grading;
the additive is ceramic powder for inhibiting sintering densification of quartz glass base powder;
the addition of the water glass is 1-8% of the mass of the quartz glass base powder, the addition of the pore-forming agent is 0-15% of the mass of the quartz glass base powder, the addition of the additive is 0-40% of the mass of the quartz glass base powder, and the addition of the water is 5-15% of the mass of the quartz glass base powder.
Preferably, the pore-forming agent is carbonate.
Preferably, the carbonate is at least one of calcium carbonate, ammonium carbonate and zinc carbonate.
Preferably, the additive is cristobalite crystals.
The preparation method of the high-collapsibility recyclable silica-based ceramic core comprises the following steps:
(1) Fully stirring and uniformly mixing the quartz glass basic powder, the water glass, the pore-forming agent, the additive and the water to obtain mud paste;
(2) Injecting or injecting the paste into a cavity of a ceramic core mold, and demolding to obtain a ceramic core blank;
(3) Drying the ceramic core blank to obtain a biscuit;
(4) And (3) checking and shaping the biscuit to obtain the silica-based ceramic core.
Preferably, in the step (2), the injection or injection pressure is 10 to 40MPa.
Preferably, in the step (3), the drying temperature is 50-200 ℃ and the drying time is 60-120 min.
The silica-based ceramic core is preheated and poured by the application of the high-collapsibility recyclable silica-based ceramic core; and removing the silica-based ceramic core from the casting precursor obtained by pouring in a physical vibration mode to obtain a casting finished product.
Preferably, when the additive is cristobalite crystal, the silica-based ceramic core is removed from the casting precursor obtained by pouring in a physical vibration mode to obtain the peeled silica-based ceramic core, and the peeled silica-based ceramic core is crushed, ball-milled and crystallized to be formed into the cristobalite crystal and is recycled as the additive.
Preferably, the crystallization temperature is 1200-1400 ℃, and the crystallization time is 2-24 hours.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, nano-scale and micro-scale silicon dioxide powder subjected to particle grading is taken as a base powder, and inorganic water glass is added as a binder, wherein the nano-scale silicon dioxide powder can play a role of a plasticizer, so that the mold core is convenient to mold, and on the premise of ensuring molding, a sintering body containing a certain micropores is obtained by utilizing crystal phase transformation in the sintering process of quartz. Especially, when ceramic powder for inhibiting sintering densification of quartz glass base powder is added, the viscosity of fused quartz at high temperature (in the preheating and pouring processes) is increased, sintering densification is hindered, and the porous silicon-based ceramic core is formed by combining the effective action of pore-forming agents, so that the high-temperature strength in the pouring process is ensured, and meanwhile, the collapsibility of the porous silicon-based ceramic core is further greatly improved. The ceramic core after finishing has high collapsibility and can be directly removed by a physical vibration mode; and the peeled ceramic core is subjected to crushing, ball milling and crystallization treatment and then is used as an additive to realize 100% recycling.
According to the preparation method disclosed by the invention, the blank is directly demoulded after being molded, so that the turnover time of a molding process can be reduced, the moisture content of the blank is low, the drying and hardening speed is high, the shrinkage deformation is small, and the dimensional accuracy is high; preheating and pouring can be directly carried out without degreasing or dewaxing, so that the production period is greatly shortened; the preparation method disclosed by the invention is simple, does not need degreasing and other processes, greatly shortens the production period, is simple and convenient to operate, has high degree of automation, low production cost and less pollution, and can realize green and efficient production of the ceramic core.
Drawings
FIG. 1 shows the three-point flexural strength of high-collapsibility, recyclable silica-based ceramic cores prepared in examples 1-5.
FIG. 2 is an XRD pattern of a high-collapsibility recyclable silica-based ceramic core prepared in example 1 after casting.
FIG. 3 is an SEM photograph of a high-collapsibility recyclable silica-based ceramic core prepared in example 1 after casting.
Fig. 4 is a photograph of the collapsibility of the high collapsibility, recyclable silica-based ceramic core prepared in example 2 after casting.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The preparation method of the high-collapsibility recyclable silica-based ceramic core comprises the following steps:
(1) Sequentially adding quartz glass basic powder, a binder, a pore-forming agent, an additive and water into special pug mill equipment to fully stir and mix uniformly, and mixing pug into semi-solid pug paste;
(2) Injecting (or injecting) the paste prepared in the step (1) into a Tao Xinmo cavity, drawing a ceramic core blank under the wet condition, and then placing the ceramic core blank in a conformal special moulding bed;
(3) Placing the ceramic core blank body prepared in the step (2) and a special tire mold into a drying furnace together for drying to obtain a biscuit;
(4) Checking and shaping the biscuit prepared in the step (3) to obtain a silica-based ceramic core which can be used for pouring, and then assembling, preheating and pouring according to actual production requirements;
(5) And (3) removing the silica-based ceramic core of the cast product obtained by the step (4) in a physical vibration mode, wherein the collapsibility is high, and the peeled silica-based ceramic core is crushed, ball-milled and crystallized to obtain square quartz crystals which are used as additives to realize 100% recycling.
In the method, the quartz glass base powder in the step (1) is powder prepared by grain grading nano-scale and micro-scale silicon dioxide, wherein the nano-scale silicon dioxide accounts for 10-75% of the powder, the nano-scale silicon dioxide plays a role of a plasticizer, and the micro-scale silicon dioxide accounts for 25-90% of the powder.
The addition amount of the binder in the step (1) is 1-8% of the mass of the quartz glass base powder, the addition amount of the pore-forming agent is 0-15% of the mass of the quartz glass base powder, the addition amount of the additive is 0-40% of the mass of the quartz glass base powder, and the addition amount of the water is 5-15% of the mass of the quartz glass base powder. The binder is water glass, the pore-forming agent is inorganic carbonate, the carbonate is at least one of calcium carbonate, ammonium carbonate and zinc carbonate, and the additive is cristobalite crystal powder.
The injection molding pressure of the step (2) is 10-40 MPa; the drying temperature in the step (3) is 50-200 ℃ and the drying time is 60-120 min; the preheating temperature in the step (4) is 1100-1300 ℃, the preheating time is 20-60 min, and the casting temperature is 1400-1600 ℃; the crystallization temperature in the step (5) is 1200-1400 ℃, and the crystallization time is 2-24 h.
Example 1:
(1) Taking quartz glass basic powder (wherein the ratio of nano powder (D50=50-100 nm) is 10 percent, the ratio of micron powder (D50=20-60 mu m) is 90 percent), water glass binder, calcium carbonate, cristobalite crystal powder and water, ensuring the mass ratio of the water glass basic powder to the calcium carbonate to the cristobalite crystal powder to the water to be 1:0.01:0:0:0.05, adding the water glass basic powder to special pug mill equipment in sequence, fully stirring and uniformly mixing, and mixing pug into semi-solid mud paste;
(2) Injecting the paste into a Tao Xinmo cavity, wherein the injection molding pressure is 10MPa, and drawing the ceramic core blank under the wet condition, and then placing the ceramic core blank into a follow-up special moulding bed;
(3) Placing the ceramic core blank and the special tire mold into a drying furnace for drying at 50 ℃ for 120min to obtain a biscuit;
(4) And (3) checking and shaping the prepared biscuit to obtain a silicon-based ceramic core which can be used for pouring, and then assembling, preheating and pouring according to actual production requirements, wherein the preheating temperature is 1100 ℃, the preheating time is 60min, and the pouring temperature is 1400 ℃.
(5) The ceramic core is removed from the cast casting in a physical vibration mode, the collapsibility is higher, the exfoliated ceramic core is crushed, ball-milled and crystallized to form cristobalite crystals, wherein the crystallization temperature is 1200 ℃, the crystallization time is 24 hours, and cristobalite powder with the crystallinity of more than 80% can be obtained and can be used as an additive to realize 100% recycling.
Example 2:
(1) Taking quartz glass basic powder (wherein the ratio of nano powder (D50=50-100 nm) is 75%, the ratio of micro powder (D50=20-60 mu m) is 25%), a water glass binder, calcium carbonate, cristobalite crystal powder and water, ensuring that the mass ratio of the water glass basic powder to the calcium carbonate to the cristobalite crystal powder is 1:0.01:0.4:0.05, adding the water glass basic powder to special pug mill equipment in sequence, fully stirring and uniformly mixing, and mixing pug into semi-solid mud paste;
(2) Injecting the paste into a Tao Xinmo cavity, wherein the injection molding pressure is 10MPa, and drawing the ceramic core blank under the wet condition, and then placing the ceramic core blank into a follow-up special moulding bed;
(3) Placing the ceramic core blank and the special tire mold into a drying furnace for drying at 50 ℃ for 120min to obtain a biscuit;
(4) And (3) checking and shaping the prepared biscuit to obtain a silicon-based ceramic core which can be used for pouring, and then assembling, preheating and pouring according to actual production requirements, wherein the preheating temperature is 1100 ℃, the preheating time is 60min, and the pouring temperature is 1400 ℃.
(5) The ceramic core is removed from the cast casting in a physical vibration mode, the collapsibility is high, and the exfoliated ceramic core is crushed, ball-milled and crystallized to form cristobalite crystals, wherein the crystallization temperature is 1200 ℃, the crystallization time is 24 hours, so that cristobalite powder with the crystallinity of more than 80% can be obtained, and 100% recycling is realized as an additive.
Example 3:
(1) Taking quartz glass basic powder (wherein the ratio of nano powder (D50=50-100 nm) is 25 percent, the ratio of micro powder (D50=20-60 mu m) is 75 percent), water glass binder, calcium carbonate, cristobalite crystal powder and water, ensuring the mass ratio of the water glass basic powder to the calcium carbonate to the cristobalite crystal powder to the water to be 1:0.03:0.05:0.3:0.08, adding special pug mill equipment in sequence, fully stirring and uniformly mixing, and mixing pug to semi-solid mud paste;
(2) Injecting the paste into a Tao Xinmo cavity, wherein the injection molding pressure is 20MPa, and drawing the ceramic core blank under the wet condition, and then placing the ceramic core blank into a follow-up special moulding bed;
(3) Placing the ceramic core blank and the special tire mold into a drying furnace for drying at 100 ℃ for 90min to obtain a biscuit;
(4) And (3) checking and shaping the prepared biscuit to obtain a silicon-based ceramic core which can be used for pouring, and then assembling, preheating and pouring according to actual production requirements, wherein the preheating temperature is 1150 ℃, the preheating time is 50min, and the pouring temperature is 1450 ℃.
(5) The ceramic core is removed from the cast casting in a physical vibration mode, the collapsibility is high, and the exfoliated ceramic core is crushed, ball-milled and crystallized to form cristobalite crystals, wherein the crystallization temperature is 1250 ℃, the crystallization time is 20 hours, so that cristobalite powder with the crystallinity of more than 80% can be obtained, and 100% recycling is realized as an additive.
Example 4:
(1) Taking quartz glass basic powder (wherein the ratio of nano powder (D50=50-100 nm) is 35%, the ratio of micro powder (D50=20-60 μm) is 65%), a water glass binder, calcium carbonate, cristobalite crystal powder and water, ensuring that the mass ratio of the quartz glass basic powder to the calcium carbonate to the cristobalite crystal powder is 1:0.05:0.08:0.25:0.1, adding special pug mill equipment in sequence, fully stirring and uniformly mixing, and mixing pug into semi-solid mud paste;
(2) Injecting the paste into a Tao Xinmo cavity, wherein the injection molding pressure is 25MPa, and drawing the ceramic core blank under the wet condition, and then placing the ceramic core blank into a follow-up special moulding bed;
(3) Placing the ceramic core blank and the special tire mold into a drying furnace for drying at 150 ℃ for 80min to obtain a biscuit;
(4) And (3) checking and shaping the prepared biscuit to obtain a silicon-based ceramic core which can be used for pouring, and then assembling, preheating and pouring according to actual production requirements, wherein the preheating temperature is 1200 ℃, the preheating time is 40min, and the pouring temperature is 1500 ℃.
(5) The ceramic core is removed from the cast casting in a physical vibration mode, the collapsibility is high, and the exfoliated ceramic core is crushed, ball-milled and crystallized to form cristobalite crystals, wherein the crystallization temperature is 1300 ℃, the crystallization time is 15 hours, so that cristobalite powder with the crystallinity of more than 80% can be obtained, and 100% recycling is realized as an additive.
Example 5:
(1) Taking quartz glass basic powder (wherein the ratio of nano powder (D50=50-100 nm) is 50%, the ratio of micro powder (D50=20-60 mu m) is 50%), a water glass binder, calcium carbonate, cristobalite crystal powder and water, ensuring that the mass ratio of the quartz glass basic powder to the calcium carbonate to the cristobalite crystal powder is 1:0.07:0.12:0.35:0.12, adding special pug mill equipment in sequence, fully stirring and uniformly mixing, and mixing pug into semi-solid mud paste;
(2) Injecting the paste into a Tao Xinmo cavity, injecting molding pressure of 30MPa, drawing to obtain a ceramic core blank under the wet condition, and then placing the ceramic core blank into a follow-up special moulding bed;
(3) Placing the ceramic core blank and the special tire mold into a drying furnace for drying at 180 ℃ for 70min to obtain a biscuit;
(4) And (3) checking and shaping the prepared biscuit to obtain a silicon-based ceramic core which can be used for pouring, and then assembling, preheating and pouring according to actual production requirements, wherein the preheating temperature is 1250 ℃, the preheating time is 30min, and the pouring temperature is 1550 ℃.
(5) The ceramic core is removed from the cast casting in a physical vibration mode, the collapsibility is high, the exfoliated ceramic core is crushed, ball-milled and crystallized to form cristobalite crystals, wherein the crystallization temperature is 1350 ℃, the crystallization time is 8 hours, and the cristobalite powder with the crystallinity of more than 80% can be obtained and used as an additive to realize 100% recycling.
Example 6:
(1) Taking quartz glass basic powder (wherein the ratio of nano powder (D50=50-100 nm) is 10 percent, the ratio of micron powder (D50=20-60 mu m) is 90 percent), a water glass binder, calcium carbonate, cristobalite crystal powder and water, ensuring the mass ratio of the quartz glass basic powder to the calcium carbonate to the cristobalite crystal powder to the water to be 1:0.08:0.15:0.15, adding the quartz glass basic powder to special pug mill equipment in sequence, fully stirring and uniformly mixing, and mixing pug to semi-solid mud paste;
(2) Injecting the paste into a Tao Xinmo cavity, injecting and molding under the pressure of 40MPa, drawing to obtain a ceramic core blank under the wet condition, and then placing the ceramic core blank into a follow-up special moulding bed;
(3) Placing the ceramic core blank and the special tire mold into a drying furnace for drying at 200 ℃ for 60min to obtain a biscuit;
(4) And (3) checking and shaping the prepared biscuit to obtain a silicon-based ceramic core which can be used for pouring, and then assembling, preheating and pouring according to actual production requirements, wherein the preheating temperature is 1300 ℃, the preheating time is 20min, and the pouring temperature is 1600 ℃.
(5) The ceramic core is removed from the cast casting in a physical vibration mode, the collapsibility is high, and the exfoliated ceramic core is crushed, ball-milled and crystallized to form cristobalite crystals, wherein the crystallization temperature is 1400 ℃, the crystallization time is 2 hours, so that cristobalite powder with the crystallinity of more than 80% can be obtained, and 100% recycling is realized as an additive.
Table 1 shows the collapse of the specific embodiment:
TABLE 1 collapse Condition of specific examples
As can be seen from Table 1, the inventive example 1 had collapsibility, and after pore-forming agent and additive were added, collapsibility was further improved. The collapsibility of example 3 was highest.
FIG. 1 shows the three-point bending strength of the high-collapsibility recyclable silica-based ceramic cores prepared in examples 1 to 6, and shows that the core bending strength is generally low after pore-forming agent (calcium carbonate) and cristobalite crystal powder are added, wherein the core bending strength in example 3 is the lowest and is reduced to about 6 MPa. FIG. 2 is an XRD pattern of the high-collapsibility recyclable silica-based ceramic core prepared in example 3, after casting, which fully demonstrates that the addition of cristobalite crystals promotes the transition of the fused quartz phase to the cristobalite phase, and that the precipitation rate of cristobalite is increased and the cristobalite content is increased. FIG. 3 is an SEM photograph of a high-collapsibility recyclable silica-based ceramic core prepared in example 3 after casting, showing that, on the one hand, porosity of the core is enhanced due to the addition of carbonate pore formers; on the other hand, after the cristobalite crystal is added, the flow of the liquid phase is blocked, so that the viscosity of the liquid phase is increased, the specific surface area of the fused quartz after crystallization is increased, the contact area between particles is reduced, the particles are combined and loose, the pores are obviously increased, and the liquid phase sintering degree is low. Fig. 4 is a photograph of vibration collapse of the high-collapsibility recyclable silica-based ceramic core prepared in example 3 after casting, (a) photograph of vibration collapse, (b) photograph of vibration after physical vibration collapse, almost all of the ceramic core falling off, the collapsibility of this example being the highest, and the casting quality being good.
The invention adopts nano-scale and micro-scale silicon dioxide powder after grain composition as basic powder, wherein the nano-scale silicon dioxide powder can play a role of plasticizer, inorganic water glass is added as binder, pore-forming agent, additive and the like are added on the basis to jointly form original powder, then a certain proportion of water is added, and the silicon-based ceramic core for pouring is obtained through pugging, injection molding and drying, and then the assembly, preheating and pouring are carried out according to actual production requirements, and finally the ceramic core is removed from the cast by physical vibration. Therefore, by adopting the preparation method, the blank is directly demoulded after being molded, the turnover time of the molding process can be reduced, the moisture content of the blank is low, the drying and hardening speed is high, the shrinkage deformation is small, and the dimensional accuracy is high; the preheating and pouring are directly carried out without degreasing or dewaxing, so that the production period is greatly shortened; particularly, due to the addition of the cristobalite crystal, the viscosity of fused quartz at high temperature (in the preheating and pouring processes) is increased, sintering densification is hindered, and the porous silicon-based ceramic core is formed by combining the effective action of the pore-forming agent, so that the high-temperature strength in the pouring process is ensured, and meanwhile, the collapsibility of the porous silicon-based ceramic core is greatly improved. The ceramic core after finishing has high collapsibility and can be directly removed by a physical vibration mode; and the peeled ceramic core is crushed, ball-milled and crystallized to be made into square quartz crystal, and the square quartz crystal is used as an additive to realize 100 percent recycling. The preparation method disclosed by the invention is simple, does not need degreasing and other processes, greatly shortens the production period, is simple and convenient to operate, has high degree of automation, low production cost and less pollution, and can realize green and efficient production of the ceramic core.
Claims (8)
1. The high-collapsibility recyclable silica-based ceramic core is characterized by comprising the following preparation raw materials: quartz glass basic powder, water glass, pore-forming agent, additive and water; the pore-forming agent is carbonate;
the quartz glass base powder is prepared from 10% -75% of nano-scale silicon dioxide and 25% -90% of micron-scale silicon dioxide by mass percent after grain grading;
the additive is ceramic powder for inhibiting sintering densification of quartz glass base powder; the additive is cristobalite crystal;
the addition amount of the water glass is 1-8% of the mass of the quartz glass base powder, the addition amount of the pore-forming agent is 0-15% of the mass of the quartz glass base powder, the addition amount of the additive is 0-40% of the mass of the quartz glass base powder, and the addition amount of the water is 5-15% of the mass of the quartz glass base powder.
2. The high-collapsibility, recyclable silica-based ceramic core of claim 1, wherein the carbonate is at least one of calcium carbonate, ammonium carbonate, and zinc carbonate.
3. The method for preparing the high-collapsibility recyclable silica-based ceramic core according to any one of claims 1 to 2, comprising the steps of:
(1) Fully stirring and uniformly mixing the quartz glass basic powder, the water glass, the pore-forming agent, the additive and the water to obtain mud paste;
(2) Injecting or injecting the paste into a cavity of a ceramic core mold, and demolding to obtain a ceramic core blank;
(3) Drying the ceramic core blank to obtain a biscuit;
(4) And (3) checking and shaping the biscuit to obtain the silica-based ceramic core.
4. The method for producing a highly collapsible recyclable silica-based ceramic core according to claim 3, wherein the injection or injection pressure in step (2) is 10 to 40MPa.
5. The method for preparing a high-collapsibility recyclable silica-based ceramic core according to claim 3, wherein in the step (3), the drying temperature is 50-200 ℃ and the drying time is 60-120 min.
6. The use of a highly collapsible, recyclable silica-based ceramic core as claimed in any one of claims 1 to 2, characterized in that the silica-based ceramic core is preheated and poured; and removing the silica-based ceramic core from the casting precursor obtained by pouring in a physical vibration mode to obtain a casting finished product.
7. The use of a highly collapsible, recyclable silica-based ceramic core as claimed in claim 6, wherein, when the additive is cristobalite, the silica-based ceramic core is removed from the casting precursor obtained by pouring by physical vibration to obtain an exfoliated silica-based ceramic core, and the exfoliated silica-based ceramic core is subjected to crushing, ball milling, crystallization treatment to form cristobalite crystal as the additive for recycling.
8. The use of a high collapsibility recyclable silica-based ceramic core as claimed in claim 7, wherein the crystallization temperature is 1200-1400 ℃ and the crystallization time is 2-24 hours.
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| CN112222362A (en) * | 2020-09-10 | 2021-01-15 | 中国科学院金属研究所 | Silicon-based ceramic core resistant to cold and hot impact, high-temperature creep and easy to remove and preparation process thereof |
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| CN105108036A (en) * | 2015-08-11 | 2015-12-02 | 陈传松 | High-permeability light modified composite water glass sand for steel casting and preparation method of high-permeability light modified composite water glass sand |
| CN112222362A (en) * | 2020-09-10 | 2021-01-15 | 中国科学院金属研究所 | Silicon-based ceramic core resistant to cold and hot impact, high-temperature creep and easy to remove and preparation process thereof |
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| CN114101593A (en) | 2022-03-01 |
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