CN113441677A - Casting process of precoated sand for producing turbine box body - Google Patents
Casting process of precoated sand for producing turbine box body Download PDFInfo
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- CN113441677A CN113441677A CN202110677236.9A CN202110677236A CN113441677A CN 113441677 A CN113441677 A CN 113441677A CN 202110677236 A CN202110677236 A CN 202110677236A CN 113441677 A CN113441677 A CN 113441677A
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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
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
Abstract
The application relates to the field of precoated sand, and specifically discloses a casting process for producing precoated sand of a turbine box body: s1, weighing and heating the raw sand, and then cooling the raw sand to a certain temperature; s2, weighing carbon nanotubes, and placing the carbon nanotubes in the cooled raw sand of S1 to obtain a mixed material A; s3, weighing the binder, and placing the binder in the mixed material A to obtain a mixed material B; s4, weighing urotropine, dissolving the urotropine in water to prepare a solution, and adding the solution into the mixed material B to obtain a mixed material C; s5, weighing the lubricant and the admixture, and placing the lubricant and the admixture in the mixed material C to obtain prepared material; and S6, blowing the preparation material into a mold box to obtain the precoated sand. By adding the carbon nano tubes, the precoated sand has better strength under the condition of a certain addition amount of the phenolic resin, cracking of the precoated sand during casting is effectively prevented, and the product quality is improved. The multi-walled carbon nano tube is modified, so that the bonding performance of the multi-walled carbon nano tube and the binder is improved, and the bonding strength between the raw sand is improved.
Description
Technical Field
The present application relates to the field of precoated sand, and more particularly it relates to a casting process for precoated sand for producing turbine casings.
Background
The turbine casing, which is the base of the fittings in the turbine, is an important fitting for supporting the components of the fixed shaft system, ensuring the correct relative position of the transmission fittings and supporting the load acting on the reducer, is usually made by sand-coated casting.
The precoated sand is prepared from raw sand, thermoplastic phenolic resin, urotropine and a reinforcing agent. When the precoated sand is transported, the structure of the precoated sand is damaged after vibration of the precoated sand easily due to insufficient strength of the precoated sand, so that the transportation is inconvenient. Meanwhile, the precoated sand is insufficient in strength, and cracks appear in the precoated sand when castings are easily caused, so that the product reject ratio is high.
Manufacturers generally increase the strength of the precoated sand by increasing the addition amount of the thermoplastic phenolic resin, but when the addition amount of the precoated sand is increased, the gas evolution amount of the precoated sand is increased, the health of workers is affected, and the quality of cast parts is also affected.
Disclosure of Invention
In order to improve the strength of the precoated sand under the condition of a certain addition amount of thermoplastic phenolic resin, the application provides a casting process of the precoated sand for producing a turbine box body
The application provides a casting process for producing tectorial membrane sand of turbine box adopts following technical scheme:
a casting process for producing precoated sand for a turbine case, comprising the steps of:
s1, weighing 100 parts of raw sand by weight, heating to 400-600 ℃, and then cooling the raw sand to 180-220 ℃;
s2, weighing 5.2-5.8 parts by weight of carbon nanotubes, placing the carbon nanotubes in the cooled raw sand of S1, and stirring and mixing the mixture uniformly at the temperature of 180 ℃ and 220 ℃ to obtain a mixed material A;
s3, weighing 1.2-1.8 parts by weight of binder, placing the binder in the mixed material A, and uniformly stirring and mixing to obtain a mixed material B;
s4, weighing 0.15-0.22 part of urotropine by weight, dissolving into 0.5-1 part of water to prepare a urotropine aqueous solution, adding the urotropine aqueous solution into the mixed material B, and stirring and mixing uniformly to obtain a mixed material C;
s5, weighing 0.5-0.7 part of lubricant and 0.3-0.5 part of additive by weight, placing the mixture in the mixed material C, and uniformly mixing to obtain a prepared material;
and S6, blowing the prepared material into a heated mould box, cooling, and removing the mould box to prepare the precoated sand.
By adopting the technical scheme, the carbon nano tube has better toughness and strength, and the surface of the multi-wall carbon nano tube is provided with a large number of micropores and a large number of active groups. The active group enables the adhesive to have better bonding strength with the carbon nano tube, and the bonding strength of the adhesive to the multi-wall carbon nano tube is obviously higher than the bonding capability to the raw sand. The multi-wall carbon nano tube is used as an intermediate substance to connect and fix a plurality of raw sands. The microporous structure on the surface of the carbon nano tube enables the adhesive to be inserted into the micropores, so that the anchoring strength is improved. When the precoated sand is acted by external force, the precoated sand can consume the stress load through a strong bonding interface with the carbon fiber or transmit the stress load to the carbon nano tube with high specific strength, so that the precoated sand can bear larger external force, and the strength of the precoated sand is improved.
Optionally, the carbon nanotube is a multi-walled carbon nanotube.
By adopting the technical scheme, compared with a single-wall carbon nanotube, the multi-wall carbon nanotube is a cylindrical body with a plurality of layers of coaxial hexagonal rings, and the multi-layer structure has certain buffering performance to external force under the action of the external force. The hard multi-walled carbon nanotube is used as an intermediate to connect a plurality of raw sands, namely, the raw sands can transmit external force to the multi-walled carbon nanotube when being subjected to the external force, the multi-walled carbon nanotube has certain buffering power to the force, so that the strength of the external force is obviously reduced when the force is transmitted to other connected raw sands, namely, the stress concentration among the raw sands is reduced, the generation and the diffusion of cracks of the precoated sand are inhibited, and the strength of the precoated sand is improved.
Optionally, the multi-walled carbon nanotube is subjected to ultraviolet irradiation modification treatment, wherein the length of ultraviolet light is 320-350nm, the irradiation time is 5-10min, and the irradiation distance is 2-4 cm.
Through the technical scheme, the ultraviolet irradiation treatment induces the surfaces of the multi-walled carbon nanotubes to generate more active groups, so that the binding force between the multi-walled carbon nanotubes and the binder is further improved, and the strength of the precoated sand is improved. And when the wavelength of the ultraviolet light is 320-350nm, the induction effect is better.
Optionally, the multi-walled carbon nanotube is treated by a treating agent before ultraviolet irradiation, the treating agent is a nitric acid aqueous solution with a mass concentration of 22-32%, and the pretreatment method comprises the following steps: soaking the multi-wall carbon nano-tube in the treating agent for 8-12min, and then fishing out and drying.
According to the technical scheme, due to the multi-wall structure of the multi-wall carbon nano tube, the inner layer structure of the multi-wall carbon nano tube is difficult to irradiate by ultraviolet light, the treating agent has good oxidizability, and the multi-wall carbon nano tube is soaked by the treating agent, so that more active groups are formed on the surface of the inner layer of the multi-wall carbon nano tube, and the binder anchored on the inner layer of the multi-wall carbon nano tube and the inner layer of the multi-wall carbon nano tube have good binding capacity, and the precoated sand strength is improved.
Optionally, the temperature of the treating agent is 60-67 ℃.
By the technical scheme, the treatment effect of the treating agent is the best within the temperature range.
Optionally, the binder is a phenolic novolac resin.
Through the technical scheme, the thermoplastic phenolic resin has good bonding performance, and bonds the raw sand and the carbon nano tubes, so that the precoated sand is formed.
Optionally, the lubricant is magnesium stearate
Through above-mentioned technical scheme, magnesium stearate plays lubricated, dispersion, anti-caking effect inside the precoated sand, improves the processability of precoated sand.
Optionally, the additive is ammonium polyphosphate.
Through the technical scheme, the raw sand contains trace metal elements, the ammonium polyphosphate has certain chelating capacity for metal ions, and the metal ions in the raw sand are chelated, so that the bonding strength between the raw sand is improved, and the strength of the precoated sand is improved.
In summary, the present application has the following beneficial effects:
1. by adding the carbon nano tubes, the precoated sand still has better strength under the condition of a certain addition amount of the phenolic resin, cracking of the precoated sand during casting is effectively prevented, and the quality of a product is improved.
2. The multi-walled carbon nanotube is modified to improve the bonding property of the multi-walled carbon nanotube and the binder, thereby improving the strength of the precoated sand.
3. By adding ammonium polyphosphate, the ammonium polyphosphate improves the bonding strength between the raw sands by chelating metal ions in the raw sands, thereby improving the strength of the precoated sand.
Detailed Description
The present application will be described in further detail with reference to examples.
| Name of raw materials | Species or origin |
| Raw sand | 100-mesh quartz sand sold by Zhangpu county Hongxiang quartz sand Co., Ltd, with a silicon dioxide content of 96-98.7wt% and a density of 2.65g/cm3 |
| Single-walled carbon nanotubes | Xuzhou Jie Innovative materials, science and technology, Inc |
| Multiwalled carbon nanotube | Weifang Hao Cheng carbon material Limited |
| Ammonium polyphosphate | Crystalline form II ammonium polyphosphate of high degree of polymerization sold by Gode chemical Co., Ltd, Longjiang Yonggdu, Zhejiang |
| Thermoplastic phenolic resin | Sold by Henan coastal industry Limited liability company under the brand name 2131 |
| Magnesium stearate | Sold by Henan Jizishun Biotech Ltd |
Preparation example
Preparation example 1
Preparing a modified multi-wall carbon nano tube:
the multi-wall carbon nano tube is subjected to ultraviolet irradiation modification treatment, wherein the length of ultraviolet light is 340nm, the irradiation time is 8min, and the irradiation distance is 3 cm.
Preparation example 2
The difference from preparation example 1 is that the ultraviolet light length is 300 nm.
Preparation example 3
The difference from preparation example 1 is that the ultraviolet light length is 370 nm.
Preparation example 4
The difference from preparation example 1 is that the multi-wall carbon nano-tube is treated by a treating agent before being irradiated by ultraviolet light, the treating agent is nitric acid water solution with the mass concentration of 27% at 25 ℃, and the pretreatment method is as follows: soaking the multi-wall carbon nano tube in the treating agent for 10min, and then fishing out and drying.
Preparation example 5
The difference from preparation example 4 is that the multi-walled carbon nanotubes are treated with a treating agent after being irradiated with ultraviolet light.
Preparation example 6
The difference from preparation example 4 was that the treatment liquid was a 15wt% nitric acid aqueous solution.
Preparation example 7
The difference from preparation example 4 was that the treatment liquid was a 35wt% nitric acid aqueous solution.
Preparation example 8
The difference from preparation example 4 is that the temperature of the treatment liquid was 65 ℃.
Preparation example 9
The difference from preparation example 4 is that the temperature of the treatment liquid was 55 ℃.
Preparation example 10
The difference from preparation example 4 is that the temperature of the treatment liquid was 75 ℃.
Examples
Example 1
A casting process for producing precoated sand for a turbine case, comprising the steps of:
s1, weighing 100kg of raw sand, heating to 400 ℃ while stirring, wherein the stirring speed is 50r/min, and then cooling the raw sand to 180 ℃;
s2, weighing 5.2kg of carbon nanotubes, placing the carbon nanotubes in the cooled raw sand of S1, and uniformly stirring and mixing the carbon nanotubes at the temperature of 180 ℃ at the stirring speed of 50r/min to obtain a mixed material A;
s3, weighing 1.2kg of binder, placing the binder in the mixed material A, and uniformly stirring and mixing the binder and the mixed material A at a stirring speed of 50r/min to obtain a mixed material B;
s4, weighing 0.15kg of urotropine, dissolving the urotropine into 0.5kg of water to obtain urotropine aqueous solution, adding the urotropine aqueous solution into the mixed material B, and uniformly stirring and mixing the urotropine aqueous solution at the stirring speed of 50r/min to obtain a mixed material C;
s5, weighing 0.5kg of magnesium stearate and 0.3kg of ammonium polyphosphate, placing the materials in the mixed material C, and uniformly mixing at 180 ℃ to obtain a prepared material, wherein the stirring speed is 50 r/min;
and S6, blowing the prepared material into a heated mould box, cooling, and removing the mould box to prepare the precoated sand.
Example 2
A casting process for producing precoated sand for a turbine case, comprising the steps of:
s1, weighing 100kg of raw sand, heating to 600 ℃ while stirring, wherein the stirring speed is 50r/min, and then cooling the raw sand to 220 ℃;
s2, weighing 5.8kg of carbon nanotubes, placing the carbon nanotubes in the cooled raw sand of S1, and uniformly stirring and mixing the carbon nanotubes at 220 ℃ at a stirring speed of 50r/min to obtain a mixed material A;
s3, weighing 1.8kg of binder, placing the binder in the mixed material A, and uniformly stirring and mixing the binder and the mixed material A at a stirring speed of 50r/min to obtain a mixed material B;
s4, weighing 0.22kg of urotropine, dissolving the urotropine into 1kg of water to obtain urotropine aqueous solution, adding the urotropine aqueous solution into the mixed material B, and uniformly stirring and mixing the urotropine aqueous solution at the stirring speed of 50r/min to obtain a mixed material C;
s5, weighing 0.7kg of magnesium stearate and 0.5kg of ammonium polyphosphate, placing the materials in the mixed material C, and uniformly mixing at 220 ℃ to obtain a prepared material, wherein the stirring speed is 50 r/min;
and S6, blowing the prepared material into a heated mould box, cooling, and removing the mould box to prepare the precoated sand.
Example 3
A casting process for producing precoated sand for a turbine case, comprising the steps of:
s1, weighing 100kg of raw sand, heating to 500 ℃ while stirring, wherein the stirring speed is 50r/min, and then cooling the raw sand to 200 ℃;
s2, weighing 5.5kg of carbon nanotubes, placing the carbon nanotubes in the cooled raw sand of S1, and uniformly stirring and mixing the carbon nanotubes at the temperature of 200 ℃ at the stirring speed of 50r/min to obtain a mixed material A;
s3, weighing 1.5kg of binder, placing the binder in the mixed material A, and uniformly stirring and mixing the binder and the mixed material A at a stirring speed of 50r/min to obtain a mixed material B;
s4, weighing 0.18kg of urotropine, dissolving the urotropine into 0.8kg of water to obtain urotropine aqueous solution, adding the urotropine aqueous solution into the mixed material B, and uniformly stirring and mixing the urotropine aqueous solution at the stirring speed of 50r/min to obtain a mixed material C;
s5, weighing 0.6kg of magnesium stearate and 0.4kg of ammonium polyphosphate, placing the materials in the mixed material C, and uniformly mixing at 200 ℃ to obtain a prepared material, wherein the stirring speed is 50 r/min;
and S6, blowing the prepared material into a heated mould box, cooling, and removing the mould box to prepare the precoated sand.
Example 4
The difference from example 3 is that multi-walled carbon nanotubes are used in place of single-walled carbon nanotubes in equal amounts.
Example 5
The difference from example 4 is that the modified multi-walled carbon nanotubes prepared in preparation example 1 were substituted for multi-walled carbon nanotubes in equal amounts.
Example 6
The difference from example 4 is that the modified multi-walled carbon nanotubes prepared in preparation example 2 were substituted for multi-walled carbon nanotubes in equal amounts.
Example 7
The difference from example 4 is that the modified multi-walled carbon nanotubes prepared in preparation example 3 were substituted for multi-walled carbon nanotubes in equal amounts.
Example 8
The difference from example 4 is that the modified multi-walled carbon nanotubes prepared in preparation example 4 equally replace multi-walled carbon nanotubes.
Example 9
The difference from example 4 is that the modified multi-walled carbon nanotubes prepared in preparation example 5 equally replace multi-walled carbon nanotubes.
Example 10
The difference from example 4 is that the modified multi-walled carbon nanotubes prepared in preparation example 6 were substituted for multi-walled carbon nanotubes in equal amounts.
Example 11
The difference from example 4 is that the modified multi-walled carbon nanotubes prepared in preparation example 7 were substituted for multi-walled carbon nanotubes in equal amounts.
Example 12
The difference from example 4 is that the modified multi-walled carbon nanotubes prepared in preparation example 8 were substituted for multi-walled carbon nanotubes in equal amounts.
Example 13
The difference from example 4 is that the modified multi-walled carbon nanotubes prepared in preparative example 9 were substituted for multi-walled carbon nanotubes in equal amounts.
Example 14
The difference from example 4 is that the modified multi-walled carbon nanotubes prepared in preparation example 10 were substituted for multi-walled carbon nanotubes in equal amounts.
Comparative example
Comparative example 1
The difference from example 3 is that no single-walled carbon nanotubes are added.
Comparative example 2
The difference from example 3 is that single-walled carbon nanotubes are replaced with equal amounts of carbon fibers having a diameter of 4um and a length of 100 um.
Comparative example 3
The difference from example 3 is that no ammonium polyphosphate was added.
Performance test
The room-temperature tensile strength of the coated sand in the examples and the comparative examples was determined by reference to JB/T8583-2008 "coated sand for casting", the test temperature was 24 + -0.5 ℃, and the test results are detailed in Table 1.
The amount of gas evolution was measured in examples 3 and 12 and the control group by referring to JB/T8583-.
TABLE 1
| Tensile strength at room temperature MPa | Gas evolution volume ml/g | |
| Example 1 | 4.2 | 12.4 |
| Example 2 | 4.2 | 12.5 |
| Example 3 | 4.2 | 12.4 |
| Example 4 | 4.6 | - |
| Example 5 | 5.0 | - |
| Example 6 | 4.7 | - |
| Example 7 | 4.8 | - |
| Example 8 | 5.4 | - |
| Example 9 | 5.2 | - |
| Example 10 | 5.1 | - |
| Example 11 | 5.2 | - |
| Example 12 | 5.8 | 12.3 |
| Example 13 | 5.6 | - |
| Example 14 | 5.6 | - |
| Comparative example 1 | 2.4 | - |
| Comparative example 2 | 2.0 | - |
| Comparative example 3 | 3.6 | - |
| Control group | 4.2 | 16.4 |
Combining examples 3 and 4 with table 1, it can be seen that the coated sand produced using multi-walled carbon nanotubes has better tensile strength. The multi-layer structure of the multi-wall carbon nano tube has certain buffering performance to external force under the action of the external force, so that the external force is consumed when being transmitted to the multi-wall carbon nano tube, the generation and the diffusion of cracks of the precoated sand are inhibited, and the tensile strength of the precoated sand is improved.
By combining the example 4 and the example 5 and combining the table 1, it can be seen that the coated sand prepared from the ultraviolet light modified multi-walled carbon nanotubes has better tensile strength, and the surface of the multi-walled carbon nanotubes modified by ultraviolet light irradiation has a large number of active groups, so that the binding force between the multi-walled carbon nanotubes and the binder is improved, and the tensile strength of the coated sand is improved.
It can be seen from the combination of examples 5-7 and table 1 that the induction effect is better when the wavelength of the ultraviolet light is 340nm, because the energy is too much or too little when the wavelength is 300nm and 370nm, which results in insufficient induction capability, or the induction is too violent, which results in the reduction of mechanical properties such as strength and toughness of the multi-wall carbon nanotube, and the reduction of tensile strength of the precoated sand.
Combining example 5 and examples 8-9 with table 1, it can be seen that the tensile strength of the coated sand can be significantly improved by soaking the multi-walled carbon nanotubes in the treating agent before the ultraviolet irradiation modification, and the nitric acid solution has a certain degree of oxidability, so that the part which is not irradiated by the ultraviolet light is treated, and the number of active groups on the surface of the multi-walled carbon nanotubes is increased. If the treating agent is soaked after ultraviolet irradiation, the multiwall carbon nanotube after ultraviolet irradiation is oxidized again, the surface of the multiwall carbon nanotube originally has certain active groups, so that the multiwall carbon nanotube reacts violently with nitric acid to cause damage to the outer wall of the multiwall carbon nanotube, and the surface bonded by the thermoplastic phenolic resin and the multiwall carbon nanotube is easy to break when subjected to external force to cause reduction of tensile strength.
When the mass concentration of nitric acid was large or small, the tensile strength of the coated sand decreased, as can be seen by combining examples 8 and 10 to 11 with table 1. When the concentration is low, the active groups formed by the multi-wall carbon nano-tube in an inducing way are insufficient, and when the concentration is high, the outer wall of the multi-wall carbon nano-tube is damaged, so that the tensile strength is reduced.
Combining example 8 and examples 12-14 with table 1, it can be seen that the treating agent has better induction performance at 65 ℃, and is not easy to damage the surface of the multi-walled carbon nanotube, thereby improving the tensile strength of the precoated sand.
As can be seen from table 1 in combination with example 3 and comparative example 1, the coated sand to which the single-walled carbon nanotubes were added had significantly improved tensile strength under the same amount of the phenol novolac resin.
By combining example 3 with comparative example 2 and table 1, it can be seen that the carbon fibers not only can not enhance the strength of the precoated sand, but also reduce the strength of the precoated sand, the carbon fibers have smooth surfaces, and the carbon fibers have poor binding ability with the phenol-formaldehyde-thermoplastic resin, so that the binding ability between the raw sand is poor, and the strength of the precoated sand is reduced.
Combining example 3 with comparative example 3 and combining table 1, it can be seen that the addition of ammonium polyphosphate can improve the tensile strength of the precoated sand to some extent.
Combining example 3 with the control group and combining table 1, it can be seen that the precoated sand obtained by the present scheme has less gas evolution under the condition of consistent or better tensile strength.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A casting process for producing precoated sand for a turbine case, characterized by comprising the steps of:
s1, weighing 100 parts of raw sand by weight, heating to 400-600 ℃, and then cooling the raw sand to 180-220 ℃;
s2, weighing 5.2-5.8 parts by weight of carbon nanotubes, placing the carbon nanotubes in the cooled raw sand of S1, and stirring and mixing the mixture uniformly at the temperature of 180 ℃ and 220 ℃ to obtain a mixed material A;
s3, weighing 1.2-1.8 parts by weight of binder, placing the binder in the mixed material A, and uniformly stirring and mixing to obtain a mixed material B;
s4, weighing 0.15-0.22 part of urotropine by weight, dissolving into 0.5-1 part of water to prepare a urotropine aqueous solution, adding the urotropine aqueous solution into the mixed material B, and stirring and mixing uniformly to obtain a mixed material C;
s5, weighing 0.5-0.7 part of lubricant and 0.3-0.5 part of additive by weight, placing the mixture in the mixed material C, and uniformly mixing to obtain a prepared material;
and S6, blowing the prepared material into a heated mould box, cooling, and removing the mould box to prepare the precoated sand.
2. A casting process for producing precoated sand for turbine cases according to claim 1, characterized in that: the carbon nano-tube is a multi-wall carbon nano-tube.
3. A casting process for producing precoated sand for turbine cases according to claim 2, characterized in that: the multi-wall carbon nano tube is subjected to ultraviolet irradiation modification treatment, the length of ultraviolet light is 320-350nm, the irradiation time is 5-10min, and the irradiation distance is 2-4 cm.
4. A casting process for producing precoated sand for a turbine case according to claim 3, characterized in that: the multi-wall carbon nano tube is treated by a treating agent before being irradiated by ultraviolet light, wherein the treating agent is a nitric acid aqueous solution with the mass concentration of 22-32%, and the pretreatment method comprises the following steps: soaking the multi-wall carbon nano-tube in the treating agent for 8-12min, and then fishing out and drying.
5. A casting process for producing precoated sand for turbine cases according to claim 4, characterized in that: the temperature of the treating agent is 60-67 ℃.
6. A casting process for producing precoated sand for turbine cases according to claim 1, characterized in that: the binder is a thermoplastic phenolic resin.
7. A casting process for producing precoated sand for turbine cases according to claim 1, characterized in that: the lubricant is magnesium stearate.
8. A casting process for producing precoated sand for turbine cases according to claim 1, characterized in that: the additive is ammonium polyphosphate.
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| CN113787165A (en) * | 2021-09-29 | 2021-12-14 | 江西特欣实业有限公司 | High-melting-point precoated sand with good fluidity |
| CN117548622A (en) * | 2024-01-05 | 2024-02-13 | 中国机械总院集团沈阳铸造研究所有限公司 | Precoated sand for selective laser sintering and preparation method thereof |
| CN117548622B (en) * | 2024-01-05 | 2024-03-12 | 中国机械总院集团沈阳铸造研究所有限公司 | Precoated sand for selective laser sintering and preparation method thereof |
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