CN113831896A - Composite phase change powder material for selective laser sintering and preparation method and application thereof - Google Patents
Composite phase change powder material for selective laser sintering and preparation method and application thereof Download PDFInfo
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- 238000000110 selective laser sintering Methods 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000012188 paraffin wax Substances 0.000 claims abstract description 71
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Abstract
The invention discloses a composite phase-change powder material for selective laser sintering and a preparation method and application thereof, wherein the composite phase-change powder material comprises the following raw material components in parts by mass: 70 to 89 parts of paraffin, 10 to 20 parts of expanded graphite and 1 to 10 parts of micro silica gel powder. The preparation method comprises the steps of preparing paraffin powder and expanded graphite powder, mixing the paraffin powder and the expanded graphite powder with micro silica gel powder, cooling to-40 ℃, grinding, and sieving to obtain the composite phase-change powder material. The composite phase change powder material has the advantages of high latent heat, high heat conductivity, good fluidity and the like, can be used for selective laser sintering molding, can be widely used for production and manufacturing of heat management components, and has high use value and application prospect. The preparation method of the composite phase-change powder material has the advantages of simple process, convenient operation, low cost and the like, is suitable for industrial production, and is beneficial to large-scale application.
Description
Technical Field
The invention belongs to the technical field of preparation of laser sintering powder materials, and relates to a composite phase-change powder material for selective laser sintering and a preparation method and application thereof.
Background
The phase change material is a substance which changes the state of a substance under the condition of constant temperature and can provide latent heat. The process of changing physical properties is called a phase change process, and in this case, the phase change material absorbs or releases a large amount of latent heat. The phase-change material is an important latent heat material, has wide application prospect in the fields of heat storage and heat management, is listed as a national research and development utilization sequence in China, such as the most representative phase-change material paraffin, and has become a key material for the research of the technical field of heat energy due to the advantages of large heat storage density, easy process control, approximately isothermal heat storage and release process, wide controllable temperature range, stable chemical property and the like. However, the single phase change material generally has the disadvantages of poor heat conductivity, and solid-liquid phase change transformation exists when heat is absorbed, so that the liquid leakage risk exists in practical application. The composite phase-change material can improve the heat conduction efficiency and application effect of the phase-change material by adding the high heat conduction material to enhance the heat conduction capability, and the leakage problem during solid-liquid phase change can be solved by selecting the proper heat conduction material and also by the capillary force generated by the proper heat conduction material.
The composite phase change material has wide application in the field of constant temperature control, such as electric vehicle battery heat management, solar energy utilization, waste heat recovery, building heat preservation, air conditioner energy conservation and the like. At present, the common forming method of the composite phase-change material is mainly a casting molding method, the phase-change material is heated to a temperature above the phase-change temperature, the phase-change material is converted into a liquid state, then a heat conduction material is added for mixing, the composite phase-change material is solidified into a blank after being cooled to a temperature below the phase-change temperature, and then the corresponding heat management part is manufactured by using the traditional forming methods of mechanical cutting, grinding and the like according to application scenes. However, the above conventional method for forming a composite phase change material has the disadvantages of long forming time, complex manufacturing process, serious material waste, inability to manufacture complex structures, high manufacturing cost, and the like, and the disadvantages greatly limit the application of the composite phase change material.
Selective laser sintering (also known as selective laser sintering) is a method for manufacturing a three-dimensional object by selectively fusing a plurality of powder layers, and has the advantages of high molding speed, less material waste, capability of manufacturing a structure with higher complexity and the like. The forming method can disperse a three-dimensional CAD model in a computer into a two-dimensional section outline, melt or sinter a powder material by using a laser beam under the control of the computer, and directly form the three-dimensional solid part in a layered superposition mode. The technology integrates laser, thermodynamics, numerical control technology, temperature control and material science, and the technology integration level is high. To date, no reports have been found about the use of selective laser sintering for the manufacture of phase change materials.
The existing phase-change powder material, such as paraffin/expanded graphite composite phase-change powder material, has the defects of poor powder flowability, low powder sphericity, uneven particle size distribution and the like, so when the phase-change powder material is used as a raw material for selective laser sintering to prepare a heat management component, the defects of poor forming precision, difficulty in control, large heat cycle loss of the heat management component and the like still exist. Therefore, the composite phase change powder material for selective laser sintering, which has high latent heat, high thermal conductivity and good fluidity, is obtained, and has very important significance for improving the forming precision and the manufacturing efficiency of selective laser sintering, reducing the manufacturing cost and preparing a thermal management part with small thermal cycle loss.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a composite phase change powder material for selective laser sintering, which has high latent heat, high thermal conductivity and good fluidity, and a preparation method and application thereof.
In order to solve the technical problems, the invention adopts the technical scheme that:
the composite phase-change powder material for selective laser sintering comprises the following raw material components in parts by mass:
70 to 89 portions of paraffin wax,
10 to 20 parts of expanded graphite,
1-10 parts of micro silica gel powder.
In the above composite phase change powder material for selective laser sintering, the composite phase change powder material further comprises the following raw material components in parts by mass:
70 to 85 portions of paraffin wax,
10 to 20 parts of expanded graphite,
5-10 parts of micro silica gel powder.
In the composite phase change powder material for selective laser sintering, the particle size of the composite phase change powder material is 50-150 μm; the sphericity of the composite phase-change powder material is more than or equal to 0.85.
As a general technical concept, the present invention also provides a method for preparing the above composite phase change powder material for selective laser sintering, comprising the steps of:
s1, cooling the paraffin to below-40 ℃ and grinding to obtain paraffin powder; grinding the expanded graphite to obtain expanded graphite powder;
s2, mixing the paraffin powder, the expanded graphite powder and the micro silica gel powder which are ground in the step S1, cooling the obtained mixed material to-40 ℃, grinding, and sieving to obtain the composite phase-change powder material.
In the above preparation method, further improvement, in step S2, the mixed material is cooled to below-40 ℃ by using liquid nitrogen; and adding liquid nitrogen in the grinding process of the mixed material to keep the temperature of the preparation system below-40 ℃.
In a further improvement of the above preparation method, in step S2, the particle size of the composite phase change powder material is 50 μm to 150 μm.
In the preparation method, the preparation method is further improved, in step S1, the paraffin is cooled to below-40 ℃ by adopting liquid nitrogen; liquid nitrogen is added in the grinding process of the paraffin wax to keep the temperature of the preparation system below-40 ℃.
In a further improvement of the above preparation method, in step S1, the paraffin is paraffin wax, and the melting point is 40 ℃ to 85 ℃; the particle size of the paraffin powder is 50-500 mu m; the particle diameter of the expanded graphite powder is 50-500 mu m.
In the preparation method, the particle size of the paraffin powder is further improved to be 100-150 mu m; the particle diameter of the expanded graphite powder is 100-150 mu m.
As a general technical concept, the invention also provides an application of the composite phase-change powder material or the composite phase-change powder material prepared by the preparation method as a raw material in preparing a heat management component.
Compared with the prior art, the invention has the advantages that:
(1) the invention provides a composite phase-change powder material for selective laser sintering, which comprises the following raw material components in parts by weight: 70 to 90 parts of paraffin, 10 to 20 parts of expanded graphite and 1 to 10 parts of micro silica gel powder. In the invention, the paraffin, the expanded graphite and the micro silica gel powder are mixed to obtain the composite phase change powder material, wherein the paraffin is used as a material mainly providing latent heat and is used for ensuring that the composite phase change material has larger latent heat; the expanded graphite is used as a heat conduction reinforcing material and is used for ensuring that the composite phase-change material has stronger heat conduction capability, meanwhile, the expanded graphite is also a porous material and has a worm-shaped structure, and molten paraffin can be adsorbed into micropores to be solidified through the capillary force action of the micropores of the expanded graphite in the laser sintering process, so that the composite phase-change powder material can effectively prevent liquid paraffin from leaking when solid-liquid phase change occurs, and the uniformity of a packaging structure and internal materials is kept good after multiple heating and cooling cycles (25-65-25 ℃); the micro silica gel powder is used as a flow aid, so that the distance between particles of the composite phase-change material can be increased, the van der Waals force between the particles can be reduced, the friction force between the particles can be reduced, and the flowability of the composite phase-change powder material at normal temperature can be increased. Based on the above, in the invention, by optimizing the proportion of the paraffin, the expanded graphite and the micro silica gel, the flowability of the powder can be further improved on the premise of ensuring that the composite phase change powder material has higher latent heat of phase change and heat conductivity, and the composite phase change powder material with high latent heat, high heat conductivity and good flowability is finally obtained, when the composite phase change powder material is used as a raw material for manufacturing a heat management component by a selective laser sintering technology, because the composite phase change powder material has better flowability, the generation of powder agglomeration can be effectively reduced, the powder paving effect of the powder material is favorably improved, the distribution uniformity and compactness of the powder on a powder bed are improved, so that the coating performance of the expanded graphite on the paraffin in the heat management component manufactured by the selective laser sintering is obviously improved, and the loss of the paraffin after heat circulation can be further reduced, namely, the thermal cycle loss is small, and meanwhile, the agglomeration phenomenon of the powder can be effectively reduced, so that the repeated utilization rate of the powder can be improved, and the production cost can be reduced. The composite phase change powder material has the advantages of high latent heat, high heat conductivity, good fluidity and the like, can be used for selective laser sintering molding, can be widely used for production and manufacturing of heat management components, and has high use value and application prospect.
(2) In the composite phase-change powder material, the paraffin, the expanded graphite and the micro-powder silica gel have the characteristics of stable chemical property, insolubility in water, non-combustibility, non-explosiveness, no toxicity, no odor, no environmental pollution and low cost, so that the composite phase-change powder material obtained by compounding the paraffin, the expanded graphite and the micro-powder silica gel has the advantages of stable chemical property, insolubility in water, non-combustibility, non-explosiveness, no toxicity, no odor, no environmental pollution, low cost and the like. Meanwhile, compared with other glidants, when the micro-powder silica gel is used as the glidant, the composite phase-change powder material with high latent heat, high thermal conductivity and good fluidity can be obtained more easily.
(3) In the composite phase-change powder material, the particle size of the composite phase-change powder material is further optimized to be 50-150 mu m, the sphericity is more than or equal to 0.85, and the particle size and the sphericity of the composite phase-change powder material are optimized, so that the flowability of the composite phase-change powder material is favorably further improved, and the powder spreading effect and the sintering performance when the composite phase-change powder material is used for selective laser sintering are favorably improved, because: if the particle size is too small (< 50 μm), electrostatic adsorption effect is generated to agglomerate the powder and reduce the fluidity of the powder, and the smaller the particle size, the more obvious the electrostatic adsorption effect is, the poorer the fluidity is, and as a result, the powder is difficult to be uniformly distributed in a powder bed in the powder paving process, and the forming precision is reduced; if the particle size is larger (larger than 150 mu m), the thickness of the powder laying layer for selective laser sintering is larger, and the precision of the formed part is poorer; on the premise of a certain particle size range, if the particle size distribution range is narrower, the larger the gap between the powders is, the smaller the apparent density is, and the molding precision is deteriorated; if the particle size distribution range is wider, the powder clearance is smaller, the apparent density is larger, and the forming precision is better; meanwhile, the higher the sphericity of the composite phase-change powder material is, the more favorable the improvement of the powder fluidity is, and particularly, the closer the sphericity is to 1, the closer the particle shape is to a sphere.
(4) The invention also provides a preparation method of the composite phase-change powder material for selective laser sintering, which takes paraffin, expanded graphite and micro silica gel as raw materials, cools the paraffin raw material or the mixed material containing the paraffin to below-40 ℃, hardens the paraffin at the moment, grinds under the condition, can improve the powder forming efficiency and reduce the particle size of the powder, thereby preparing the composite phase-change powder material with high sphericity and good particle size distribution uniformity. The preparation method has the advantages of simple process, convenient operation, low cost and the like, is suitable for industrial production, and is beneficial to large-scale application.
(5) In the preparation method of the composite phase-change powder material, liquid nitrogen is used as a coolant or a heat preservation agent, and rapid cooling or heat preservation can be realized, so that the hardening of paraffin can be effectively realized, the preparation of the composite phase-change powder material is convenient, and the adopted liquid nitrogen has the advantages of low cost, environmental protection, no pollution and the like.
(6) In the preparation method of the composite phase-change powder material, the particle diameters of the paraffin and the expanded graphite are firstly ground to 50-500 mu m, more preferably 100-150 mu m through grinding, so that the continuous mixing grinding efficiency is improved, and the composite phase-change powder material with the particle diameter of 50-150 mu m is prepared.
(7) The invention provides an application of a composite phase change powder material as a raw material in preparing a heat management component, wherein the composite phase change powder material is used as a raw material for selective laser sintering molding to prepare the heat management component, so that the composite phase change powder material has the advantages of high manufacturing speed, less material waste, low production cost and the like, and the heat management component with complex shape, high precision, high latent heat and high heat conductivity can be prepared.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Fig. 1 is a flow chart of a preparation process of the composite phase-change powder material in embodiment 1 of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
If not stated otherwise, the data used in the present invention are all the average data of three or more tests.
Example 1
The composite phase-change powder material for selective laser sintering comprises the following raw material components in parts by mass:
80 parts of paraffin wax, namely 80 parts of,
15 parts of expanded graphite, namely 15 parts of expanded graphite,
5 parts of micro silica gel powder.
In this example, the particle size of the composite phase-change powder material is 50 μm to 150 μm, and the sphericity is 0.85.
The sphericity calculation formula is as follows:
wherein, VpIs the volume of the particles, SpIs the particle surface area.
The preparation method of the composite phase change powder material for selective laser sintering in the embodiment comprises the following steps:
(1) respectively weighing paraffin, expanded graphite and superfine silica powder according to the mass ratio of 80:15:5 (calculated according to 100 parts).
(2) Putting the weighed solid paraffin (the melting point is 56 ℃) into a mortar, pouring liquid nitrogen at-196 ℃ into the mortar to submerge the paraffin, grinding the paraffin after the paraffin is hardened (the temperature is not higher than-40 ℃), continuing adding the liquid nitrogen to keep the paraffin temperature below-40 ℃ in the grinding process, repeating the steps until the grain diameter of the paraffin powder reaches 100-150 mu m, screening the paraffin powder through a three-dimensional vibrating screen, and placing the prepared powder in a low-temperature environment for later use.
(3) Putting the weighed expanded graphite into a grinder, grinding for 2 minutes for refining, pouring the expanded graphite into a three-dimensional vibrating screen for screening after the expanded graphite is refined by the grinder, and obtaining the crushed expanded graphite (expanded graphite powder) with the particle size of 100-150 mu m.
(4) And (3) mixing the weighed micro silica gel powder with the powder prepared in the step (2) and the step (3), putting the mixture into a mortar, adding liquid nitrogen at the temperature of-196 ℃ to submerge the mixed powder to reduce the temperature of the mixed powder to below-40 ℃, further grinding the mixed powder, adding the liquid nitrogen in the grinding process to keep the paraffin temperature not higher than-40 ℃, and screening by using a three-dimensional vibrating screen to obtain the composite phase-change powder material with the particle size of 50-150 mu m.
Example 2
The composite phase-change powder material for selective laser sintering comprises the following raw material components in parts by mass:
85 parts of paraffin wax, namely, paraffin wax,
10 parts of expanded graphite, namely 10 parts of expanded graphite,
5 parts of micro silica gel powder.
In this example, the particle size of the composite phase change powder material is 50 μm to 150 μm, and the sphericity is 0.93.
The preparation method of the composite phase change powder material for selective laser sintering in the embodiment comprises the following steps:
(1) respectively weighing paraffin, expanded graphite and superfine silica powder according to the mass ratio of 85:10:5 (calculated according to 100 parts).
(2) Putting the weighed solid paraffin (the melting point is 56 ℃) into a planetary ball mill, pouring liquid nitrogen at-196 ℃ into a ball mill tank to submerge the paraffin, adding a manganese steel ball as a grinding medium after the paraffin is hardened, starting grinding for 5 minutes at the speed of 120rpm, continuously adding liquid nitrogen at-196 ℃ into the ball mill tank to keep the temperature of the grinding process below-40 ℃, continuously grinding for 5 minutes at the speed of 120rpm, screening the ground powder through a three-dimensional vibrating screen to obtain paraffin powder with the particle size of 100-150 microns, and placing the prepared powder in a low-temperature environment for later use.
(3) Putting the weighed expanded graphite into a grinder, grinding for 2 minutes for refining, pouring the expanded graphite into a three-dimensional vibrating screen for screening after the expanded graphite is refined by the grinder, and obtaining the crushed expanded graphite (expanded graphite powder) with the particle size of 100-150 mu m.
(4) And (3) mixing the weighed superfine silica powder with the powder prepared in the steps (2) and (3), putting the mixture into a planetary ball mill, adding liquid nitrogen at the temperature of-196 ℃ to submerge the mixed powder to reduce the temperature to below-40 ℃, adding a manganese steel ball as a grinding medium, grinding the mixture for 3 minutes at the speed of 100rpm, and screening the mixed powder by using a three-dimensional vibrating screen to obtain the composite phase-change material powder with the particle size of 50-150 microns.
Example 3
A method for preparing a composite phase change powder material for selective laser sintering, substantially the same as example 2, except that: in embodiment 3, the composite phase-change powder material comprises the following raw materials in parts by weight:
70 parts of paraffin wax, namely 70 parts of,
20 parts of expanded graphite, namely 20 parts of expanded graphite,
10 parts of micro silica gel powder.
The composite phase change powder material prepared in example 3 had a particle size of 50 μm to 150 μm and a sphericity of 0.93.
Example 4
A method for preparing a composite phase change powder material for selective laser sintering, substantially the same as example 2, except that: in embodiment 4, the composite phase-change powder material comprises the following raw materials in parts by weight:
89 parts of paraffin wax, namely, a paraffin wax,
15 parts of expanded graphite, namely 15 parts of expanded graphite,
1 part of silica gel micropowder.
The composite phase change powder material prepared in example 4 had a particle size of 50 μm to 150 μm and a sphericity of 0.91.
Comparative example 1
A method for preparing a composite phase-change powder material, which is substantially the same as the method in the embodiment 2, except that: in the comparative example 1, the composite phase-change powder material comprises the following raw materials in parts by mass:
80 parts of paraffin wax, namely 80 parts of,
20 parts of expanded graphite.
Comparative example 2
A method for preparing a composite phase-change powder material, which is substantially the same as the method in the embodiment 2, except that: in the comparative example 2, the composite phase-change powder material comprises the following raw materials in parts by mass:
75 parts of paraffin wax, namely,
10 parts of expanded graphite, namely 10 parts of expanded graphite,
15 parts of talcum powder.
The composite phase change powder material prepared in comparative example 2 had a particle size of 50 μm to 150 μm and a sphericity of 0.91.
Comparative example 3
A method for preparing a composite phase-change powder material, which is substantially the same as that in example 1, except that: in the comparative example 3, the micro silica gel powder is directly mixed with the powder prepared in the step (2) and the step (3) to obtain the composite phase-change powder material.
TABLE 1 comparison of the Properties of different composite phase change powder materials in inventive examples 1-4 and comparative examples 1-3
As can be seen from table 1, the latent heat of the composite phase-change powder materials prepared in examples 1 to 4 of the present invention is 120J/g or more, and the composite phase-change powder materials have a high latent heat, and the latent heat of the composite phase-change powder materials increases as the proportion of paraffin wax in the composite phase-change powder materials increases.
As is clear from Table 1, the comparative pure paraffin wax (thermal conductivity 0.25 W.m)-1·K-1) The thermal conductivity of the composite phase-change powder materials prepared in the embodiments 1 to 4 of the present invention is significantly improved, and particularly, the thermal conductivity increases with the increase of the proportion of the expanded graphite in the composite phase-change powder material. In practical application, the paraffin wax can cause slow heat dissipation if being directly made into a heat management component, and the thermal conductivity is improved to 1 W.m by adding the expanded graphite-1·K-1Therefore, the heat dissipation rate of the heat management component can be effectively improved, and the heat dissipation effect of the heat management component can be enhanced.
The repose angle of the material is used for representing the fluidity of the material, specifically, the angle between the slope surface stacked when the powder is stacked in a static state and the horizontal plane, the flowability of the powder is represented, and the smaller the repose angle is, the better the flowability of the powder is. As can be seen from table 1, the composite phase change powder materials prepared in examples 1 to 4 of the present invention have a small repose angle, which indicates that the composite phase change powder materials prepared in examples 1 to 4 of the present invention have good flowability, wherein the composite phase change powder material in example 3 has a repose angle of 28.6 ° and exhibits flowability. Because of the inherent viscosity of paraffin, pure paraffin can hardly be ground into powder, so that no flowability exists, so that micropowder silica gel is required to be added when preparing the composite phase-change powder material containing paraffin, the flowability of the composite phase-change powder material is mainly determined by the content of the micropowder silica gel, generally speaking, the flowability of the composite phase-change powder material is good when the content of the micropowder silica gel is high, and the flowability of the composite phase-change powder material is poor when the content of the micropowder silica gel is low. In addition, the fluidity of the composite phase-change powder material is also influenced by the particle size, the particle size distribution width and the sphericity of the material, namely, the composite phase-change powder material can be ensured to have better fluidity by optimizing the particle size, the particle size distribution width and the sphericity of the composite phase-change powder material.
As can be seen from table 1, the sphericity of the composite phase-change powder material prepared in examples 1 to 4 of the present invention is not less than 0.85, and in particular, the sphericity of the composite phase-change powder material prepared in examples 2 to 3 is close to 1, and the particle shape is close to a sphere, which is favorable for the fluidity of the composite phase-change powder material, and the result is consistent with the fluidity effect corresponding to the repose angle.
As can be seen from table 1, the powder consistency of the composite phase-change powder materials prepared in examples 1 to 4 of the present invention is not less than 0.88, and particularly, the powder consistency of the composite phase-change powder materials prepared in examples 2 to 3 is not less than 0.9, and the particle size distribution is close to the normal distribution, so that the design requirements are met, the flowability of the composite phase-change powder materials is facilitated, and the results are consistent with the flowability effect corresponding to the repose angle. In table 1, D25 is the particle size corresponding to the cumulative percent particle size distribution of the sample at 25%; d50 is the corresponding particle size when the cumulative percentage of particle size distribution of the sample reaches 50%; d75 is the particle size corresponding to the cumulative percent particle size distribution of the sample at 75%.
As can be seen from Table 1, when the composite phase change powder material prepared in the embodiments 1-4 of the present invention is used as a raw material for manufacturing a thermal management component by a selective laser sintering technique, the thermal cycle quality loss of the obtained thermal management component is small, which indicates that the coating performance of the expanded graphite on paraffin in the thermal management component manufactured by the selective laser sintering is significantly improved,
in addition, in comparative example 1, since no flow aid such as aerosil was added, the obtained powder was seriously agglomerated and could not be smoothly ground into powder, and thus, the data of the related powder could not be tested. In comparative example 2, talc powder was used instead of aerosil as a flow aid, and the obtained powder had poor performance, and when the powder of comparative document 2 was used as a raw material for manufacturing a heat management part by the selective laser sintering technique, the heat cycle quality loss of the obtained heat management part was large, which indicates that the powder was not suitable for the selective laser sintering technique. In comparative example 3, the overall properties of the powder were not as good as those of examples 1 to 4, and the thermal cycle quality loss of the thermal management part obtained in comparative document 3 was large, indicating that the powder was not suitable for the selective laser sintering technique.
The above examples are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples. All technical schemes belonging to the idea of the invention belong to the protection scope of the invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention, and such modifications and embellishments should also be considered as within the scope of the invention.
Claims (10)
1. The composite phase-change powder material for selective laser sintering is characterized by comprising the following raw material components in parts by mass:
70 to 89 portions of paraffin wax,
10 to 20 parts of expanded graphite,
1-10 parts of micro silica gel powder.
2. The composite phase change powder material for selective laser sintering according to claim 1, comprising the following raw material components in parts by mass:
70 to 85 portions of paraffin wax,
10 to 20 parts of expanded graphite,
5-10 parts of micro silica gel powder.
3. The composite phase change powder material for selective laser sintering according to claim 1 or 2, wherein the particle size of the composite phase change powder material is 50 μ ι η to 150 μ ι η; the sphericity of the composite phase-change powder material is more than or equal to 0.85.
4. A method for preparing the composite phase change powder material for selective laser sintering according to any one of claims 1 to 3, comprising the following steps:
s1, cooling the paraffin to below-40 ℃ and grinding to obtain paraffin powder; grinding the expanded graphite to obtain expanded graphite powder;
s2, mixing the paraffin powder, the expanded graphite powder and the micro silica gel powder which are ground in the step S1, cooling the obtained mixed material to-40 ℃, grinding, and sieving to obtain the composite phase-change powder material.
5. The method according to claim 4, wherein in step S2, the mixed material is cooled to a temperature below-40 ℃ with liquid nitrogen; and adding liquid nitrogen in the grinding process of the mixed material to keep the temperature of the preparation system below-40 ℃.
6. The method according to claim 5, wherein in step S2, the particle diameter of the composite phase change powder material is 50 μm to 150 μm.
7. The method according to any one of claims 4 to 6, wherein in step S1, the paraffin is cooled to-40 ℃ or lower with liquid nitrogen; liquid nitrogen is added in the grinding process of the paraffin wax to keep the temperature of the preparation system below-40 ℃.
8. The method according to any one of claims 4 to 6, wherein in step S1, the paraffin is paraffin wax, and the melting point is 40 ℃ to 85 ℃; the particle size of the paraffin powder is 50-500 mu m; the particle diameter of the expanded graphite powder is 50-500 mu m.
9. The production method according to claim 8, wherein the paraffin powder has a particle diameter of 100 to 150 μm; the particle diameter of the expanded graphite powder is 100-150 mu m.
10. Use of the composite phase change powder material according to any one of claims 1 to 3 or the composite phase change powder material prepared by the preparation method according to any one of claims 4 to 9 as a raw material in preparation of a heat management component.
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Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60204806A (en) * | 1984-03-29 | 1985-10-16 | Toshiba Corp | Production of sintered body consisting of composite material |
| JPH10245491A (en) * | 1997-03-03 | 1998-09-14 | Osaka Prefecture | Expanded graphite-based composition, molding product, baked material, and its production |
| US20020009574A1 (en) * | 2000-05-30 | 2002-01-24 | Saburou Hiraoka | Planographic printing plate precursor and manufacturing method of planographic printing plate |
| US20040084658A1 (en) * | 2002-10-28 | 2004-05-06 | Oswin Ottinger | Material mixtures for heat storage systems and production method |
| US20050258394A1 (en) * | 2004-05-18 | 2005-11-24 | Sgl Carbon Ag | Latent heat storage material, latent heat storage unit containing the material, processes for producing the material and the unit and processes for using the material |
| JP2006328143A (en) * | 2005-05-24 | 2006-12-07 | Hitachi Chem Co Ltd | Heat storage material and method for producing the same |
| US20080230203A1 (en) * | 2005-05-12 | 2008-09-25 | Christ Martin U | Latent Heat Storage Material and Process for Manufacture of the Latent Heat Storage Material |
| US20120313033A1 (en) * | 2011-06-10 | 2012-12-13 | Chung-Shan Institute of Science and Technology, Armaments, Bureau, Ministry of National Defense | Method for Making a Highly Thermally Conductive Composite |
| CN103951971A (en) * | 2014-05-12 | 2014-07-30 | 湖南华曙高科技有限责任公司 | Carbon fiber reinforced resin powder material for selective laser sintering |
| CN104875395A (en) * | 2015-05-15 | 2015-09-02 | 湖南大学 | Preparation method of forming material for selective laser sintering |
| CN105985632A (en) * | 2015-10-28 | 2016-10-05 | 合肥学院 | Powder material for selective laser sintering and preparation method thereof |
| CN106916572A (en) * | 2015-12-25 | 2017-07-04 | 中关村人居环境工程与材料研究院 | Phase-changing energy-storing plate and its manufacture method |
| CN108300427A (en) * | 2018-03-19 | 2018-07-20 | 唐山易达墨烯科技有限公司 | Paraffin expanded graphite composite phase-changing material and preparation method thereof |
| CN108641359A (en) * | 2018-04-01 | 2018-10-12 | 安徽弘泰精密机械科技有限公司 | A kind of 3D printing paraffin powder material |
| CN109233302A (en) * | 2017-06-30 | 2019-01-18 | 航天特种材料及工艺技术研究所 | A kind of phase change composite material, preparation method and use |
| CN110669258A (en) * | 2019-10-08 | 2020-01-10 | 湖南大学 | Modified flake graphite powder, resin-based carbon brush and preparation method |
| CN110746782A (en) * | 2019-10-31 | 2020-02-04 | 常州威斯双联科技有限公司 | High-performance wave-absorbing heat-conducting silica gel gasket convenient for die cutting and laminating and preparation method thereof |
-
2020
- 2020-09-08 CN CN202010936189.0A patent/CN113831896B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60204806A (en) * | 1984-03-29 | 1985-10-16 | Toshiba Corp | Production of sintered body consisting of composite material |
| JPH10245491A (en) * | 1997-03-03 | 1998-09-14 | Osaka Prefecture | Expanded graphite-based composition, molding product, baked material, and its production |
| US20020009574A1 (en) * | 2000-05-30 | 2002-01-24 | Saburou Hiraoka | Planographic printing plate precursor and manufacturing method of planographic printing plate |
| US20040084658A1 (en) * | 2002-10-28 | 2004-05-06 | Oswin Ottinger | Material mixtures for heat storage systems and production method |
| US20050258394A1 (en) * | 2004-05-18 | 2005-11-24 | Sgl Carbon Ag | Latent heat storage material, latent heat storage unit containing the material, processes for producing the material and the unit and processes for using the material |
| US20080230203A1 (en) * | 2005-05-12 | 2008-09-25 | Christ Martin U | Latent Heat Storage Material and Process for Manufacture of the Latent Heat Storage Material |
| JP2006328143A (en) * | 2005-05-24 | 2006-12-07 | Hitachi Chem Co Ltd | Heat storage material and method for producing the same |
| US20120313033A1 (en) * | 2011-06-10 | 2012-12-13 | Chung-Shan Institute of Science and Technology, Armaments, Bureau, Ministry of National Defense | Method for Making a Highly Thermally Conductive Composite |
| CN103951971A (en) * | 2014-05-12 | 2014-07-30 | 湖南华曙高科技有限责任公司 | Carbon fiber reinforced resin powder material for selective laser sintering |
| CN104875395A (en) * | 2015-05-15 | 2015-09-02 | 湖南大学 | Preparation method of forming material for selective laser sintering |
| CN105985632A (en) * | 2015-10-28 | 2016-10-05 | 合肥学院 | Powder material for selective laser sintering and preparation method thereof |
| CN106916572A (en) * | 2015-12-25 | 2017-07-04 | 中关村人居环境工程与材料研究院 | Phase-changing energy-storing plate and its manufacture method |
| CN109233302A (en) * | 2017-06-30 | 2019-01-18 | 航天特种材料及工艺技术研究所 | A kind of phase change composite material, preparation method and use |
| CN108300427A (en) * | 2018-03-19 | 2018-07-20 | 唐山易达墨烯科技有限公司 | Paraffin expanded graphite composite phase-changing material and preparation method thereof |
| CN108641359A (en) * | 2018-04-01 | 2018-10-12 | 安徽弘泰精密机械科技有限公司 | A kind of 3D printing paraffin powder material |
| CN110669258A (en) * | 2019-10-08 | 2020-01-10 | 湖南大学 | Modified flake graphite powder, resin-based carbon brush and preparation method |
| CN110746782A (en) * | 2019-10-31 | 2020-02-04 | 常州威斯双联科技有限公司 | High-performance wave-absorbing heat-conducting silica gel gasket convenient for die cutting and laminating and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 陆威 等: "纳米铝粉/石蜡/膨胀石墨复合相变材料的制备及性能研究", 热能动力工程, vol. 32, no. 02, pages 101 - 105 * |
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