CN214636172U - Ultra-fine powder particle gathering and cooling tank type structure - Google Patents
Ultra-fine powder particle gathering and cooling tank type structure Download PDFInfo
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- CN214636172U CN214636172U CN202120198835.8U CN202120198835U CN214636172U CN 214636172 U CN214636172 U CN 214636172U CN 202120198835 U CN202120198835 U CN 202120198835U CN 214636172 U CN214636172 U CN 214636172U
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Abstract
The utility model relates to a tank type structure for gathering and cooling superfine powder particles, which is arranged in a superfine powder particle preparation system and comprises a gas outlet and reflux structure, a particle forming control structure and a tank type diversion material distribution structure which are connected in sequence; the front end of the air outlet and reflux structure is connected with a preposed high-temperature evaporator, and the rear end of the tank type reversal material distribution structure is connected with a postposition collecting and cooling structure. This patent carries out accurate control to each stage in the submicron powder particle forming process through specific structure, including temperature field control, speed field control, the control of connecting between each structure makes its inside circulation and the even through each controlled part of steam that passes through, provides stable controllable condition for submicron powder particle takes shape, and the particle diameter of taking shape is even, the appearance is stable, and the dispersion is good.
Description
Technical Field
The utility model belongs to the technical field of superfine powder particle preparation, in particular to a superfine powder particle gathering and cooling tank type structure.
Background
When the forming and cooling technology for preparing the ultrafine powder particles by using an evaporation condensation gas phase method is used, the required prepared substances are firstly heated and gasified at high temperature, and then solidified and formed in a liquid state from a gas state, because the ultrafine powder particles required to be prepared are microscopic materials, mostly nano-scale, submicron-scale or micron-scale powder, the formed particles have small size, very high forming speed and very high temperature, and the technical principle of forming is simple, but the actual application is very difficult. If powder particles which can be used in batches are required to be prepared, the particle size is uniform, the morphology is stable, the dispersion is good, and the difficulty is higher.
The common method comprises a flaring structure, which slows down the flow speed of steam and then controls the particle formation; or the cooling structure of blowing lets steam cool off fast, and these two kinds of methods either are that the outer skin temperature is inhomogeneous in the air current, or blow and admit air the inlayer and lead to inside flow state inhomogeneous, all can lead to the appearance of a large amount of super small and super large granules, influence the follow-up use of powder.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a submicron powder particle gathering cooling tank formula structure and submicron powder particle forming method to solve prior art and can lead to a large amount of super small and the appearance of super big granule, influence the problem of the follow-up use of powder.
The utility model discloses a realize through following technical scheme:
a tank type structure for gathering and cooling superfine powder particles is arranged in a superfine powder particle preparation system and comprises a gas outlet and reflux structure, a garbage reflux structure or garbage collection structure, a particle forming control structure and a tank type direction-changing material distribution structure which are sequentially connected;
the front end of the air outlet and reflux structure is connected with a preposed high-temperature evaporator, and the rear end of the tank type direction-changing material distribution structure is connected with a postposition collection structure;
the system for preparing the superfine powder particles further comprises a heating system arranged in the high-temperature evaporator and used for providing a heat source, a feeding system used for providing raw materials for the high-temperature evaporator, a circulating cooling system used for providing cooling, a gas source or circulating gas system used for providing current carrying and cooling, a pressure balance system used for providing pressure balance control, and a gas-solid separation system or a gas-solid-liquid separation system used for collecting parts.
Furthermore, the front end of the air outlet and reflux structure is connected with an air outlet of the high-temperature evaporator, and the interior of the air outlet and reflux structure at least comprises a first channel for high-temperature steam to enter; and a heat preservation or heating device is arranged on the outer side of the first channel.
Furthermore, the interior of the garbage backflow structure or the garbage collection structure at least comprises a second channel, the front end of the second channel is connected with the first channel, and the rear end of the second channel is connected with the inner cavity of the particle forming control structure; and a heat preservation or heating device is arranged on the outer side of the second channel.
Furthermore, the front end of an inner cavity of the particle forming control structure is connected with the second channel, the rear end of the inner cavity is connected with an air inlet pipe of an air injection cooling structure or a tank type turning and distributing structure, an ultrafine particle forming area is arranged in the inner cavity, a heat preservation or heating or cooling structure is arranged in the particle forming control structure, the temperature of the ultrafine particle forming area is indirectly controlled through heat conduction or heat radiation, and the speed of particles passing through the ultrafine particle forming area along with carrier gas is controlled through the speed of the carrier gas and the section size of the ultrafine particle forming area.
Furthermore, an air injection cooling structure can be additionally arranged between the particle forming control structure and the tank type direction-changing material distribution structure and used for pre-cooling formed particles, the air injection cooling structure at least comprises an internal third channel, the front end of the air injection cooling structure is communicated with an ultra-fine powder particle forming area, the rear end of the air injection cooling structure is connected with the tank type direction-changing material distribution structure, a porous inner-layer plate is arranged outside the third channel, and cooling gas is uniformly injected into the third channel from the periphery of the porous inner-layer plate.
Further, the tank-type diversion material distribution structure comprises a diversion tank-type cavity, an air inlet pipeline and an air outlet pipeline are connected to the diversion tank-type cavity, the air inlet pipeline is connected with a third channel or the particle forming control structure, and the air outlet pipeline is connected with the collection structure;
the inner parts of the air inlet pipeline and the air outlet pipeline can be additionally provided with required inner layer heat insulation structures or cooling structures according to the structure and function requirements of the equipment;
and the included angle between the axial central line of the air inlet pipeline and the axial central line of the air outlet pipeline is 30-150 degrees.
Further, the data relation between the volume V of the variable-direction tank-type cavity and the internal sectional area S1 of the air inlet port is as follows:
V/S1>100, wherein the unit of V is cubic centimeter and the unit of S1 is square centimeter.
Furthermore, one or more than one cooling fluid inlet is/are arranged on the diversion tank type cavity, the cooling fluid is gas or liquid, the cooling fluid enters the diversion tank type cavity through the cooling fluid inlet, and the carrier gas and the powder passing through the diversion tank type cavity are mixed and cooled.
The utility model has the advantages that:
this patent carries out accurate control to each stage in the submicron powder particle forming process through specific structure, including temperature field control, speed field control, the control of connecting between each structure uses its inside circulation and the even through each controlled site of steam that passes through, provides stable controllable condition for submicron powder particle takes shape, and the particle diameter of taking shape is even, the appearance is stable, and the dispersion is good.
Drawings
Fig. 1 is a simple schematic diagram of the inside of the ultra-fine powder particle aggregation cooling tank structure of the utility model.
Description of the reference numerals
1. The device comprises an air outlet and backflow structure 2, a garbage backflow structure or garbage collection structure 3, a particle forming control structure 4, an air injection cooling structure 41, air injection 5 at a first air injection cooling structure, a tank type direction-changing material distribution structure 51, a cooling fluid inlet 6, an inner cavity 7 in a high-temperature evaporator and a collector.
Detailed Description
The technical solutions of the present invention are described in detail by the following embodiments, which are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not interpreted as limiting the technical solutions of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus are not to be construed as limiting the present invention, and furthermore, the terms "first", "second", and "third" are only used for descriptive purposes and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The structure is used for preparing ultrafine particles, including but not limited to metal ultrafine particles, and in the following examples, the preparation of metal ultrafine particles is taken as an example, but the structure is not limited to be used for preparing metal ultrafine particles.
When the evaporation condensation gas phase method is used for preparing nano-scale, submicron-scale or micron-scale micro-particle powder, a particle aggregation cooling pipe tank structure and a particle forming method are used, the particle aggregation cooling pipe tank structure is a channel, each interface connection mode is designed in the channel to communicate each part, each stage in the particle forming process is accurately controlled through a specific structure, the temperature field control, the speed field control and the control of connection among the structures are included, steam which flows through the structure uniformly passes through each controlled part to provide stable and controllable conditions for particle forming, conditions are created for micro-particle forming, substances to be prepared are changed into liquid from gas state to liquid state, the liquid state is changed into solid state, the gas state is mutually collided and condensed into smaller liquid cores, and the smaller liquid cores are mutually collided and connected into larger liquid drops or the gas state is collided with the smaller liquid cores to form larger liquid drops, the larger liquid drops continuously collide with each other to grow or are solidified into solid particles, the smaller liquid core and the solid particles are combined into larger solid particles or become a core-shell structure, the gas state and the solid particles are combined into larger solid particles or become a core-shell structure, and the solid particles are continuously cooled, so that particles with the expected particle size and morphology are prepared. The formed particles have uniform particle size, stable appearance and good dispersion.
As shown in fig. 1, the present application provides an ultrafine particle aggregation cooling tank structure, which is installed in an ultrafine particle preparation system, and in the ultrafine particle preparation system of the present application, further includes a heating system installed in a high-temperature evaporator to provide a heat source, a feeding system to provide raw materials into the high-temperature evaporator, a circulating cooling system to provide cooling, a gas source or circulating gas system to provide current carrying and cooling, and a pressure equalization system to provide pressure equalization control, and a gas-solid separation system or gas-solid-liquid separation system of a collection part, which are all the prior art, and the connection relationship or structure thereof is not improved in the present application, and therefore, a detailed description thereof is not given herein, and it can be obtained by the prior patent documents.
Meanwhile, the application also provides various functional sections in the ultrafine powder particle gathering cooling pipe type structure, the sectional shapes, the caliber sizes and the like of the functional sections can be set to be the same or similar or deformed or reduced according to needs, the connection of the functional sections can be designed according to needs, and meanwhile, the length of the functional sections can be selected according to needs without affecting the implementation of the technical scheme; each functional segment may also be a plurality of segments, which are spliced or integrated into a whole structure, and is specifically adjusted according to actual needs (such as site, production amount, etc.), and is not limited or improved in the technical solution of the present application.
The focus of this application is for setting up in the gathering cooling tube pot-type structure between high temperature evaporator and collection structure, including giving vent to anger that connects gradually and flow structure, rubbish flow structure or garbage collection structure, particle forming control structure and pot-type diversion material structure.
The front end of the air outlet and reflux structure is connected with an air outlet of a front-mounted high-temperature evaporator, and the rear end of the tank type turning material distribution structure is connected with a rear-mounted collection structure.
The inside of the gas outlet and reflux structure at least comprises a first channel for allowing high-temperature steam to enter, a gas outlet and reflux structure shell is arranged on the outer side of the first channel, a heat insulation structure is arranged between the first channel and the gas outlet and reflux structure shell, a reinforcing structure or heating equipment is arranged on the outer side of the first channel, the gas outlet and reflux structure shell is of a sandwich structure, circulating cooling liquid passes through the inside of the jacket structure, the first channel is made of a material which does not physically or/and chemically react with a material to be prepared, and the temperature of the gas outlet and the inside of the reflux structure is controlled to be higher than the melting point of the superfine powder particle material to be prepared through heat insulation or heating.
The particle forming device comprises a garbage backflow structure or a garbage collection structure, wherein the garbage backflow structure or the garbage collection structure at least comprises a second channel inside, the front end of the second channel is connected with the first channel, and the rear end of the second channel is connected with the inner cavity of the particle forming control structure; when guaranteeing that gas passes through, flow back after melting into liquid with the rubbish in top pipeline or the passageway, or in collecting the rubbish in top pipeline or the passageway into the garbage bin, prevent to hinder gaseous passing through in the passageway. The outside of the second channel is provided with a heat preservation or heating device, the temperature inside the garbage backflow structure is controlled to be higher than the melting point of the required preparation material through the heat preservation or heating device, or the temperature inside the ventilation channel of the garbage collection structure is controlled to be higher than the melting point of the required preparation material, and the temperature inside the garbage retention storage barrel is lower than the melting point of the required preparation material.
The particle forming control structure is characterized in that the front end of an inner cavity of the particle forming control structure is connected with a second channel, the rear end of the inner cavity is connected with an air injection cooling structure or an air inlet pipe of a tank-type turning material distribution structure, an ultrafine particle forming area is arranged in the particle forming control structure and is a channel structure, the particle forming control structure is mainly used for controlling particle forming, a heat preservation or heating or cooling structure is arranged in the particle forming control structure, the temperature of the ultrafine particle forming area is indirectly controlled through heat conduction or heat radiation, the speed of particles passing through the ultrafine particle forming area along with carrier gas is controlled through the speed of the carrier gas and the section size of the ultrafine particle forming area, and stable and controllable conditions are provided for particle forming.
The particle forming control structure comprises an outer shell structure, a middle insulating layer and an inner heat conduction layer;
the outer shell structure is a jacket structure, and a coolant is used for flowing through the jacket structure;
the middle heat-insulating layer is of a single-layer or multi-layer structure;
the inner heat conducting layer forms a heat-insulating channel, namely an ultra-fine powder particle forming area, and is used for indirectly controlling the temperature of a substance flowing in the channel in a heat conduction or heat radiation mode.
Through the particle forming control structure, a substance to be prepared is changed into a liquid state from a gas state, the liquid state is changed into a solid state, the gas state is mutually collided and condensed into a smaller liquid core, the smaller liquid core is mutually collided and condensed into a larger liquid drop or the gas state is collided with the smaller liquid core to form a larger liquid drop, the larger liquid drop continuously collides with each other to grow or is solidified into solid particles, the smaller liquid core and the solid particles are combined into larger solid particles or a core-shell structure, the gas state and the solid particles are combined into larger solid particles or a core-shell structure, and the solid particles are continuously cooled, so that particles with the expected particle size and shape are prepared.
An air injection cooling structure can be additionally arranged between the particle forming control structure and the tank type direction-changing material distribution structure and used for pre-cooling formed particles, the air injection cooling structure at least comprises an inner third channel, the front end of the air injection cooling structure is communicated with an ultra-fine particle forming area, the rear end of the air injection cooling structure is connected with the direction-changing material distribution structure, a porous inner layer plate is arranged in the third channel, cooling gas is uniformly injected into the third channel from the periphery of the air injection cooling structure, and soft agglomeration or hard agglomeration of the formed particles when agglomeration occurs due to high temperature is prevented.
The tank-type diversion material distribution structure comprises a diversion tank-type cavity, wherein an air inlet pipeline and an air outlet pipeline are connected to the diversion tank-type cavity, the air inlet pipeline is connected with a third channel or the particle forming structure, and the air outlet pipeline is connected with the collecting structure; and the included angle between the axial central line of the air inlet pipeline and the axial central line of the air outlet pipeline is 30-150 degrees.
The application also provides a method for forming the ultrafine powder particles, which uses the ultrafine powder particle aggregation cooling pipe tank type structure, and comprises the following steps:
s1, adding the material of the superfine powder particles to be prepared into a high-temperature evaporator, mixing the material steam subjected to heating evaporation with carrier gas to form mixed gas, then entering a gas outlet and backflow structure from a gas outlet of the high-temperature evaporator, and controlling the temperature in the gas outlet and backflow structure to be higher than the melting point of the material to be prepared through heat preservation or heating;
s2, the mixed gas enters a particle forming control structure after passing through a gas outlet and backflow structure, a garbage backflow structure or a garbage collection structure, the temperature of each part of the ultrafine particle forming area is indirectly controlled through heat conduction or heat radiation in an ultrafine particle forming area in the particle forming control structure through a heat insulation structure or a heating structure or a cooling structure, the speed of the particles passing through each area inside along with the carrier gas is controlled through the carrier gas speed and the pipeline section size, stable and controllable conditions are provided for particle forming, substances to be prepared are changed from a gas state into a liquid state, the liquid state into a solid state, the gas state is mutually collided and condensed into smaller liquid cores, the smaller liquid cores are mutually collided and connected into larger liquid drops or the gas state is collided and condensed into larger liquid drops with the smaller liquid cores, the larger liquid drops are continuously collided and grown or solidified into solid particles, the smaller liquid cores and the solid particles are combined into larger solid particles or into a core-shell structure, the gas state and the solid particles are combined into larger solid particles or become a core-shell structure, and the solid particles are continuously cooled, so that particles with the expected particle size and morphology are prepared;
s3, the particles with the expected particle size and shape prepared in the step S2 directly enter the tank type diversion material distribution structure under the carrying of the carrier gas, defective product particles and good product particles in the particles are separated, the good product particles move to the next procedure under the carrying of the carrier gas, and the defective product particles are gathered to the garbage backflow structure or the garbage collection structure.
And S4, the good product particles enter a collecting structure under the carrying of the carrier gas, the formed superfine powder particles are separated from the carrier gas, the superfine powder particles are collected into products, and the carrier gas is discharged or recycled.
Or, the particles with the expected particle size and morphology prepared in the step S2 enter the first air injection cooling structure under the carrying of the carrier gas, the cooling gas is uniformly injected into the internal channel from the periphery through the porous inner plate, and the particles are mixed and cooled with the entering high-temperature gas and the formed particles and then enter the tank type direction-changing material distribution structure.
The data relation between the volume V of the cavity of the tank-type direction-changing material distribution structure and the inner sectional area S1 of the air inlet port is as follows:
V/S1>100, wherein V is volume in cubic centimeters and S1 is internal cross-sectional area in square centimeters.
The tank-type diversion material distribution structure is characterized in that one or more cooling fluid inlets are formed in the cavity of the tank-type diversion material distribution structure, the cooling fluid is gas or liquid, and enters the diversion cavity through the cooling fluid inlets to mix and cool carrier gas and powder passing through the diversion tank-type cavity.
The collected cooled formed particles are collected as a product and the carrier gas is discharged or recycled.
Through the matching and connection of the structures, the device is connected with a front-arranged high-temperature evaporator and a rear-arranged collecting and cooling structure, a heating system for providing a heat source is arranged in the high-temperature evaporator, a front-arranged feeding system for providing raw materials is arranged in the high-temperature evaporator, a cooling circulating cooling system is provided, a current-carrying and cooling gas source or circulating gas system is provided, a pressure balance system for providing pressure balance control is matched with a gas-solid separation system or a gas-solid-liquid separation system of a collecting part, the continuous circulating industrial production process of particle aggregation cooling forming is completed, and nano-scale, submicron-scale or micron-scale powder with uniform particle size, stable shape and good dispersion is prepared.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A tank type structure for gathering and cooling ultrafine powder particles is characterized by being arranged in an ultrafine powder particle preparation system and comprising a gas outlet and reflux structure, a garbage reflux structure or garbage collection structure, a particle forming control structure and a tank type direction-changing material distribution structure which are sequentially connected;
the front end of the air outlet and reflux structure is connected with a preposed high-temperature evaporator, and the rear end of the tank type direction-changing material distribution structure is connected with a postposition collection structure;
the system for preparing the superfine powder particles further comprises a heating system arranged in the high-temperature evaporator and used for providing a heat source, a feeding system used for providing raw materials for the high-temperature evaporator, a circulating cooling system used for providing cooling, a gas source or circulating gas system used for providing current carrying and cooling, a pressure balance system used for providing pressure balance control, and a gas-solid separation system or a gas-solid-liquid separation system used for collecting parts.
2. The ultra-fine powder particle aggregation cooling tank structure as claimed in claim 1, wherein the front end of the gas outlet and return structure is connected with a gas outlet of the high-temperature evaporator, and the inside of the gas outlet and return structure comprises at least a first channel for the high-temperature steam to enter; and a heat preservation or heating device is arranged on the outer side of the first channel.
3. The ultra-fine powder particle aggregation cooling tank structure as claimed in claim 2, wherein the inside of the garbage reflow structure or the garbage collection structure comprises at least a second channel, the front end of the second channel is connected with the first channel, and the rear end of the second channel is connected with the inner cavity of the particle formation control structure; and a heat preservation or heating device is arranged on the outer side of the second channel.
4. The ultra-fine powder particle aggregation cooling tank type structure as claimed in claim 3, wherein the front end of the inner cavity of the particle forming control structure is connected with the second channel, the rear end of the inner cavity is connected with an air inlet pipe of an air injection cooling structure or a tank type direction-changing material distribution structure, an ultra-fine powder particle forming area is arranged in the inner cavity of the particle forming control structure, a heat preservation or heating or cooling structure is arranged in the particle forming control structure, the temperature of the ultra-fine powder particle forming area is indirectly controlled through heat conduction or heat radiation, and the speed of particles passing through the ultra-fine powder particle forming area along with a carrier gas is controlled through the speed of the carrier gas and the section size of the ultra-fine powder particle forming area.
5. The ultra-fine powder particle gathering and cooling tank type structure as claimed in claim 4, wherein an air-jet cooling structure is additionally arranged between the particle forming control structure and the tank type direction-changing material distribution structure for pre-cooling formed particles, the air-jet cooling structure at least comprises an internal third channel, the front end of the air-jet cooling structure is communicated with an ultra-fine powder particle forming area, the rear end of the air-jet cooling structure is connected with the tank type direction-changing material distribution structure, a porous inner plate is arranged outside the third channel, and cooling gas is uniformly sprayed into the third channel from the periphery.
6. The ultra-fine powder particle gathering and cooling tank structure as claimed in claim 4 or 5, wherein the tank type direction-changing material distribution structure comprises a direction-changing tank type cavity, an air inlet pipeline and an air outlet pipeline are connected to the direction-changing tank type cavity, the air inlet pipeline is connected with a third channel or a particle forming control structure, and the air outlet pipeline is connected with a collection structure;
the air inlet pipeline and the air outlet pipeline are additionally provided with required inner layer heat insulation structures or cooling structures according to the structure and function requirements of the equipment;
and the included angle between the axial central line of the air inlet pipeline and the axial central line of the air outlet pipeline is 30-150 degrees.
7. The ultra-fine powder particle aggregation cooling tank structure as claimed in claim 6, wherein the data relation between the volume V of the diversion tank cavity and the internal sectional area S1 of the air inlet port is as follows:
V/S1>100, wherein the unit of V is cubic centimeter and the unit of S1 is square centimeter.
8. The ultra-fine powder particle aggregation cooling tank structure as claimed in claim 6, wherein one or more cooling fluid inlets are arranged on the diversion tank cavity, the cooling fluid is gas or liquid, the cooling fluid enters the diversion tank cavity through the cooling fluid inlets, and the carrier gas and the powder passing through the diversion tank cavity are mixed and cooled.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120198835.8U CN214636172U (en) | 2021-01-25 | 2021-01-25 | Ultra-fine powder particle gathering and cooling tank type structure |
| US18/035,940 US20230415115A1 (en) | 2021-01-25 | 2021-09-03 | Ultrafine powder particle aggregation and cooling tank-type structure and ultrafine powder particle forming method |
| PCT/CN2021/116493 WO2022156224A1 (en) | 2021-01-25 | 2021-09-03 | Ultrafine powder particle aggregation and cooling tank structure and ultrafine powder particle forming method |
| JP2023507605A JP2023536917A (en) | 2021-01-25 | 2021-09-03 | Agglomeration Cooling Tank Type Structure of Ultrafine Particles and Ultrafine Particle Forming Method |
| TW111102259A TW202231345A (en) | 2021-01-25 | 2022-01-19 | Ultrafine powder particles aggregation cooling tank structure and method for forming ultrafine powder particle |
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| CN202120198835.8U CN214636172U (en) | 2021-01-25 | 2021-01-25 | Ultra-fine powder particle gathering and cooling tank type structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022156229A1 (en) * | 2021-01-25 | 2022-07-28 | 钟笔 | Controller for controlling formation of ultrafine powder particles |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022156229A1 (en) * | 2021-01-25 | 2022-07-28 | 钟笔 | Controller for controlling formation of ultrafine powder particles |
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