CN100441501C - System for preparing nanometer silicon nitride powder - Google Patents
System for preparing nanometer silicon nitride powder Download PDFInfo
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- CN100441501C CN100441501C CNB021382638A CN02138263A CN100441501C CN 100441501 C CN100441501 C CN 100441501C CN B021382638 A CNB021382638 A CN B021382638A CN 02138263 A CN02138263 A CN 02138263A CN 100441501 C CN100441501 C CN 100441501C
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Abstract
The present invention discloses a production system which adopts a plasma gas phase synthetic method to prepare silicon nitride nanometer materials. The production system comprises a plasma generator and a gas phase synthesizer. Solid state Si#-[3]N#-[4] and HCL generated by the gas phase synthesizer enter a separator to reduce the pressure and disperse agglomerated particles. A collection device is used for collecting finished products Si#-[3]N#-[4]. The plasma generator is compressed by adopting rotary airflow, an anode mechanical structure and cooled water to form an ion arc with high-speed and stable flame. A carrier gas distributing device provides annular carrier gas for a reaction chamber along the chamber wall of the reaction chamber from top to bottom so that when product granules do not grow in time, the product granules are conveyed in time. A cooling and collecting device completes the collection of Si#-[3]N#-[4] so as to obtain nanometer silicon nitride ceramic powder.
Description
Technical field
The present invention discloses the production system that a kind of employing plasma gas-phase synthesizing method prepares silicon nitride nano-material.
Background technology
The silicon nitride ceramics powder Application Areas is very wide, as wear resistant tools and part, and general heat-and corrosion-resistant parts, internal combustion turbine, diesel motor, chemical industry, national defence and other thermic devices.At present, the preparation of general beta-silicon nitride powder is the liquid process that adopts silicon powder nitride, superfine grinding by the nitrogenize product, (100～10nm) grades silicon nitride then needs to adopt the novel process of induced with laser, and it is less and cost an arm and a leg that present domestic laser method prepares ultrafine powder of silicon nitride body scale to obtain nanometer.In order to overcome the deficiency that laser method exists, the technician begins energy is concentrated in the research that utilizes plasma arc synthesis of nano silicon nitride ceramics powder, in the hope of reducing production costs, though can produce qualified nano-silicon nitride ceramics powder, still there is following defective in prior art: (1) exists energy dispersion, slow, the scouring force defect of insufficient of speed as the energy supplier's of gas phase nano materials plasma generator, and arc flame shakiness, thereby the quality product of the nano-silicon nitride ceramics powder that influence makes; (2) the gas phase synthetic as nano material specifically installs, prior art can't realize making the reaction zone that speeds away behind solid-state nitration silicon and the gaseous state hcl reaction, cause particle to grow up easily, be difficult to powder granule is controlled at nano level (100～20nm), thereby the quality product of the nano-silicon nitride ceramics powder that influence makes, the reaction zone because powder can not in time speed away product will occur in a large number attached in the synthesizer simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of arc flame concentration of energy, speed is fast, arc flame is stable plasma source to guarantee to make raw material fully to participate in reaction, and the system of the preparation Nano powder of silicon nitride of the reaction zone that speeds away when making prepared product be in nano level.
A kind of system for preparing Nano powder of silicon nitride is characterized in that:
The present invention includes plasma generator, by working gas Ar, N
2, H
2Form plasma arc through the starting the arc, commentaries on classics arc, and keep the reducing atmosphere around the plasma arc zone;
The plasma arc that above-mentioned plasma generator produces is transported to apparatus for gas-phase synthesis, reactant gases SiCL
4And NH
3Import in the apparatus for gas-phase synthesis by the road, and keep material balance and temperature of reaction environment;
The solid-state Si that above-mentioned apparatus for gas-phase synthesis produces
3N
4Enter in the separator with HCL, decompression disperses agglomerating particles;
Above-mentioned material enters capturing device by the blower unit guiding through cooling line and captures collection finished product Si
3N
4
Described plasma generator comprises anode bodies, anode component, cathode assembly that being provided with in its tube chamber is fitted to each other is used to produce plasma arc, there is the tubular cavity that passes through for plasma arc described anode component inside, the one end is the taper hole shape and constitutes running fit with the conical end portion of cathode parts that the other end links to each other with apparatus for gas-phase synthesis; The cooperation position place of close anode component, cathode assembly is provided with can wrap the cyclonic arrangement that is attached to around the plasma arc and imports the starting the arc, commentaries on classics arc gas in the cyclone mode; Around the tubular cavity of above-mentioned anode component, be provided with cooling water cavity;
Described apparatus for gas-phase synthesis comprises that an inwall of being made by the graphite pipe fitting is the reaction chamber of Wen's structural cavity body, its outside is provided with the cooling chamber that is made of the interlayer sleeve pipe, the interlayer sleeve pipe is provided with to be convenient to the continuous interconnecting piece of plasma body producer, the upper end that is positioned at the reaction chamber chamber of interconnecting piece one end is communicated with the plasma arc output channel of plasma generator, also be provided with the raw material intake line on the reaction chamber, the upper end of described reaction chamber is provided with the carrier gas input channel, this path communicates with the carrier gas distribution device that the top of reaction chamber is provided with, and is provided with the carrier gas path that enters reaction chamber inside along the inwall of reaction chamber from top to bottom between this carrier gas distribution device and the reaction chamber;
The tubular cavity of described anode component inside is roughly step-like cylindrical cavity, is minor diameter elongated hole section near the position of taper hole, and the cooling water path that is provided with on the cooling water cavity around the above-mentioned tubular cavity and the anode bodies is communicated with;
Described cyclonic arrangement comprises that revolves a gas bushing, and its tube wall is provided with and is communicated with the inside and outside through hole of sleeve pipe, the source of the gas pipeline connection of the outer end of through hole and the starting the arc, commentaries on classics arc gas, and introduce along the tangential direction of revolving the gas bushing inwall the inner of through hole;
Described carrier gas distribution device comprise one communicate with the carrier gas input channel be positioned at ring-type carrier gas cavity around the plasma inlet, the ring-type carrier gas cavity is communicated with the carrier gas path, and described carrier gas path is to form by cooperating in the circular clearance mode between the chamber wall of cyclic disk and reaction chamber.
As shown from the above technical solution, the scheme that the present invention has structurally adopted three cascade combined pressures to contract, promptly provide the mode of swirling eddy to compress, the compression of the physical construction of anode component and water coolant compression, scheme by above-mentioned three grades of compressions makes the plasma arc that is produced by effectively compression is concentrated, thereby the plasma arc of the high speed of formation, stationary flame provides reliable energy safeguard for preparing high-quality nano-silicon nitride ceramics powder; In addition, the energy that the plasma arc utilization that is provided by above-mentioned producer is provided, in reaction, make raw material can carry out the reaction of maximum, and provide the annular carrier gas from top to bottom by carrier gas distribution device chamber wall along reaction chamber in reaction chamber, under the dual function of an annular carrier gas and rapid plasma arc, in time carried when product particle is not in time grown up, and under the drive of high velocity air, entered cooling system, and on can the chamber wall attached to reaction chamber, the solid-state Si of generation
3N
4Reduce pressure in separator with HCL and to disperse agglomerating particles, finish Si by cooling and capturing device again
3N
4Collect, thereby obtain nano-silicon nitride ceramics powder.
Description of drawings
Fig. 1 is a system schematic of the present invention;
Fig. 2 is the structural representation of ionic medium arc producer of the present invention and apparatus for gas-phase synthesis;
Fig. 3 is the structural representation of anode bodies;
Fig. 4 is an A-A sectional view among Fig. 3;
Fig. 5 is the structural representation that revolves gas bushing;
Fig. 6 is an A-A sectional view among Fig. 5;
Fig. 7 is a B-B sectional view among Fig. 5;
Fig. 8 is the A-A sectional view among Fig. 2;
Fig. 9 is the structural representation of raw material intake line;
Figure 10 is the structural representation of separator.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As Fig. 1, the present invention includes plasma generator, by working gas Ar, N
2, H
2Form plasma arc through the starting the arc, commentaries on classics arc, and keep the reducing atmosphere around the plasma arc zone;
The plasma arc that above-mentioned plasma generator produces is transported to apparatus for gas-phase synthesis, reactant gases SiCL
4And NH
3Import in the apparatus for gas-phase synthesis by the road, and keep material balance and temperature of reaction environment;
The solid-state Si that above-mentioned apparatus for gas-phase synthesis produces
3N
4Enter in the separator with HCL, decompression disperses agglomerating particles;
Above-mentioned material enters capturing device by the blower unit guiding through cooling line and captures collection finished product Si
3N
4
Referring to Fig. 2, plasma generator comprises positive anode bodies 10, being provided with in its tube chamber is fitted to each other is used to produce anode component 20, the cathode assembly 30 of plasma arc, there is the tubular cavity 21 that passes through for plasma arc described anode component 20 inside, the one end is the taper hole shape and constitutes running fit with the conical end portion of cathode assembly 30, the other end links to each other with apparatus for gas-phase synthesis, introduce in the apparatus for gas-phase synthesis of silicon nitride, by this tubular cavity 21 by the plasma arc that this device produces for synthesizing silicon nitride provides reliable thermal source; The cooperation position place of close anode component 20, cathode assembly 30 is provided with can wrap the cyclonic arrangement that is attached to around the plasma arc and imports the starting the arc, commentaries on classics arc gas in the cyclone mode, under the effect of this cyclonic arrangement, when the starting the arc, commentaries on classics arc gas enter the position of anode component 20, cathode assembly 30 cooperation generation plasma arcs, because the starting the arc, commentaries on classics arc gas are cold air, therefore under the dual function of revolving gas and cold conditions of the starting the arc, commentaries on classics arc gas, the plasma arc that produces can be compressed effectively, concentrate, avoid plasma arc to disperse.The tubular cavity 21 of described anode component 20 inside is roughly step-like cylindrical cavity, position near taper hole is a minor diameter elongated hole section, when the cavity of this aperture structure passes through at the guiding plasma arc, the effect of can effectively play compression, concentrating plasma arc; The cooling water path 11 that is provided with on cooling water cavity 22 around the above-mentioned tubular cavity 21 and the anode bodies 10 is communicated with, and the effect that cooling water cavity 22 can play compression, concentrated plasma arc equally is set.
Referring to Fig. 2,5,6,7, described cyclonic arrangement comprises that revolves a gas bushing 40, its tube wall is provided with and is communicated with the inside and outside through hole 41 of sleeve pipe, the source of the gas pipeline connection of the outer end of through hole 41 and the starting the arc, commentaries on classics arc gas, introduce along the tangential direction of revolving gas bushing 40 inwalls the inner of through hole 41, can guarantee the effective compression to the plasma arc that is produced like this.What the described through hole 41 that revolves on the gas bushing 40 was mutually symmetrical on same cross section is provided with 3～5, what provide among Fig. 5 is 4 through holes, they enter from the four direction of arranging symmetrically each other along circumference in same cross section, and the through hole 41 among Fig. 6 is for having imported arc gas; On another cross section, along circumference each other symmetrically be provided with 3～5, the through hole 41 among Fig. 7 is four, their change arc gas for input.Shown in the structure among Fig. 6,7, the air-flow of the through hole 41 on two cross sections enter that the back forms sense of rotation identical, can strengthen the cyclone effect like this, make the compression uniformity that is subjected to around the plasma arc, make that it keeps concentrating, characteristic fast.
Referring to Fig. 2,3,4, the Kong Changyu aperture ratio of the minor diameter elongated hole section in the described tubular cavity 21 is generally 2～5, and ratio is 3～4 comparatively desirable.Described anode bodies 10 is provided with input aperture 12 and two delivery ports 13 of two water coolants, the structure of this multichannel cooling water path can guarantee the refrigerative homogeneity, thereby guarantee the compression uniformity that is subjected to around the plasma arc, make that it keeps concentrating, characteristic fast.Input aperture 12 is corresponding to the position at tolerance clearance place between the conical surface of anode component 20, cathode assembly 30, the taper hole, two input apertures, the 12 parallel to each other and reverse tangential directions along anode bodies 10 inner chambers are introduced, and the setting of this position is in order to make plasma arc begin both to be subjected to from compression uniformly and effectively on every side from firm generation.
As seen from Figure 4, two current delivery ports 13 lay respectively at and 12 vertical diameter two ends, above-mentioned input aperture, simultaneously referring to Fig. 1,2,3, be connected with the sleeve pipe 50 that is enclosed within anode component 20 outsides on the described anode bodies 10, the cavity 51 between the outer wall of sleeve pipe 50 and anode component 20 links to each other with cooling water path 11 with above-mentioned tubular cavity 21 respectively and constitutes the path of water coolant.Sleeve pipe 50 is process structure parts, is convenient to constitute the path of water coolant on the one hand by adding sleeve pipe 50, makes the structure of each parts be unlikely too complex again simultaneously.
As shown in Figure 2, described anode bodies 10 is provided with the adjustment mechanism of tolerance clearance between the conical surface of regulating anode, cathode assembly 20,30, the taper hole, tolerance clearance is implemented to regulate between the conical surface by this adjustment mechanism antianode, cathode assembly 20,30, the taper hole, can change the flow of working gas, this has unusual effect to changing the plasma arc arc voltage, thereby can satisfy the requirement of the product of different process requirement to voltage and current.The adjustment mechanism of described tolerance clearance comprises that a local body is positioned at anode bodies 10 inner and sleeve pipes 60 relatively-stationary with it, the inner end of sleeve pipe 60 is resisted against revolves on the gas bushing 40, cathode assembly 30 links to each other with the governor lever 70 that inside is provided with cooling water channel, governor lever 70 is at sleeve pipe 60 and revolve in gas bushing 40 inner chambers and can move vertically, and the cylindrical outer surface of cathode assembly 30 enters the path clearance between anode component 20, cathode assembly 30 conical surfaces with revolving to have between the gas bushing 40 for the starting the arc, commentaries on classics arc gas.
Below in conjunction with Fig. 2 the principle of work of the plasma generator among the present invention is made brief description.
Connect suitable high frequency to the present invention and play arc power, the elevated pressure nitrogen, hydrogen, the argon gas that meet processing condition through the cyclonic arrangement input, electrical system is the high frequency starting the arc under appropriate voltage and current conditions, the plasma arc that is produced revolve that air pressure contracts, obtain to concentrate under the polynary compound compressed environment of mechanically compress and cooled compressed, plasma arc fast, and arrive apparatus for gas-phase synthesis by arc footpath path and provide synthetic environment for it.
Below in conjunction with the principle of work brief description of Fig. 1 to the adjustment mechanism in gap.
Sleeve pipe 60 and to revolve gas bushing 40 fixing with anode bodies 10 by pressure cap 80, rotating casing 60 is provided with turning handle 90, because turning handle 90 can only rotate with respect to sleeve pipe 60, move along its axis with 70 of the governor levers of turning handle 90 thread fit, inner end owing to governor lever 70 links to each other with cathode assembly 30 simultaneously, so when rotating turning handle 90, the columned position of the rear of cathode assembly 30 moves in revolving gas bushing 40 vertically, thereby realized the adjustment of tolerance clearance between the conical surface, taper hole of anode component 20, cathode assembly 30.
Referring to Fig. 2,8, the apparatus for gas-phase synthesis of preparation Nano powder of silicon nitride disclosed by the invention comprises that an inwall that is made by graphite pipe fitting 120 is rendered as the reaction chamber 121 of Wen's structural cavity body, its outside is provided with the cooling chamber 131 that is made of interlayer sleeve pipe 130, can realize forced refrigeration, interlayer sleeve pipe 130 is provided with to be convenient to the continuous interconnecting piece 110 of plasma body producer, the upper end that is positioned at reaction chamber 121 chambers of interconnecting piece 110 1 ends is communicated with the plasma arc output channel of plasma generator, also be provided with raw material intake line 150 on the reaction chamber 121, the upper end of described reaction chamber 121 is provided with carrier gas input channel 100, this path 100 communicates with the carrier gas distribution device that the top of reaction chamber 121 is provided with, and is provided with the carrier gas path 141 that enters reaction chamber 121 inside along the inwall of reaction chamber 121 from top to bottom between this carrier gas distribution device and the reaction chamber 121.Reaction chamber 121 adopts Wen's structure, and ionic current speed can be strengthened in its trunnion position, can reach supersonic speed, and cooling is quickened at the extension tube position, can effectively prevent grain growth like this.
Described carrier gas distribution device comprise one communicate with carrier gas input channel 100 be positioned at ring-type carrier gas cavity 142 around the plasma inlet, ring-type carrier gas cavity 142 is communicated with carrier gas path 141.
Described carrier gas path 141 is to form by cooperating in uniform circular clearance mode between the chamber wall of cyclic disk 140 and reaction chamber 121.Can realize the top blast function by carrier gas distribution device 140, promptly have the N of certain pressure and flow
2Air-flow purges downwards along the chamber wall of reaction chamber 121 continuously, and the powder that reaction is generated in time flows to capturing device along pipeline.
As shown in Figure 9, described raw material intake line 150 is provided with several, and be arranged in symmetrically on the contour cross section perpendicular to axial direction, raw material intake line 150 ends that extend in the reaction chamber 121 are positioned at the below that enters reaction chamber inlet 122 near plasma arc, gaseous ion concentration was even when the even layout of raw material intake line 150 made reaction, and the gas chemistry building-up process is even and stable.Raw material intake line 150 has four, transport to the below of reaction chamber inlet 122 between the outlet 151 of end and the horizontal plane with angle α, 0≤α≤60 ° wherein as shown in Figure 1, 2, 3, are designed to multiple structure with the outlet of end, can be level, downward-sloping, the concrete angle that tilts can have a plurality of, adapting to differing materials reaction process separately, when for example producing the silicon nitride nano powder, ammonia is the level input, SiCL
4Be the input of tilting, promptly the ammonia ion from top to bottom with SiCL
4The synthetic Si that generates of ion
3N
4According to the actual desired raw material gas of producing product, select corresponding feeding pipe, and according to the concrete processing parameter of producing the variant production reaction when determining temperature of reaction, utilize the specific rule of gradient of plasma arc temperature, to produce dissimilar products.
Adopt the scheme of on same contour cross section, evenly arranging raw material intake line 150 among the present invention, can significantly simplify the difficulty of processing of parts, and effectively improved the assembly technology and the layout of device.
As shown in figure 10, the apparatus for gas-phase synthesis lower end has a taper transition conduit 161 of changing from small to big to link to each other with separator 160, in this programme, and Si
3N
4Enter separator 160 from apparatus for gas-phase synthesis through behind the trunnion of little caliber, because the volume in the separator 160 becomes greatly Si suddenly
3N
4Environmental stress also just suddenly reduce, therefore explosion phenomenon occurs, thereby will effectively disperse agglomerating particles; Referring to Fig. 1, be connected with the cooling line 173 of horizontal layout on the separator 160, above cooling line 173, also be provided with a cooling line 171 parallel with cooling line 173, be provided with the vertical cooling line 172 that both are communicated with between the cooling line 171 that one end links to each other with capturing device 180 and the cooling line 173, the lower end of cooling line 172 is provided with detachable end 174, the decoration form of this pipeline helps equipment installation, maintenance and cleaning.
In Fig. 1, also be provided with drip washing retrieving arrangement 190 after the capturing device 180, make native system to tail gas is handled, thereby satisfy environmental requirement.
Claims (7)
1, a kind of system for preparing Nano powder of silicon nitride is characterized in that:
Comprise plasma generator, by working gas Ar, N
2, H
2Form plasma arc through the starting the arc, commentaries on classics arc, and keep the reducing atmosphere around the plasma arc zone;
The plasma arc that above-mentioned plasma generator produces is transported to apparatus for gas-phase synthesis, reactant gases SiCL
4And NH
3Import in the apparatus for gas-phase synthesis by the road, and keep material balance and temperature of reaction environment;
The solid-state Si that above-mentioned apparatus for gas-phase synthesis produces
3N
4Enter in the separator with HCL, decompression disperses agglomerating particles;
Above-mentioned material enters capturing device by the blower unit guiding through cooling line and captures collection finished product Si
3N
4
Above-mentioned plasma generator comprises anode bodies (10), the anode component (20) that being provided with in its tube chamber is fitted to each other is used to produce plasma arc, cathode assembly (30), there is the tubular cavity (21) that passes through for plasma arc described anode component (20) inside, the one end is the taper hole shape and constitutes running fit with the conical end portion of cathode assembly (30) that the other end links to each other with apparatus for gas-phase synthesis; The cooperation position place of close anode component (20), cathode assembly (30) is provided with can wrap the cyclonic arrangement that is attached to around the plasma arc and imports the starting the arc, commentaries on classics arc gas in the cyclone mode; Tubular cavity (21) in above-mentioned anode component (20) is provided with cooling water cavity (22) on every side;
Above-mentioned apparatus for gas-phase synthesis comprises that an inwall of being made by graphite pipe fitting (120) is the reaction chamber (121) of Wen's structural cavity body, its outside is provided with the cooling chamber (131) that is made of interlayer sleeve pipe (130), interlayer sleeve pipe (130) is provided with to be convenient to the continuous interconnecting piece (110) of plasma body producer, the upper end that is positioned at reaction chamber (121) chamber of interconnecting piece (110) one ends is communicated with the plasma arc output channel of plasma generator, also be provided with raw material intake line (150) on the reaction chamber (121), the upper end of described reaction chamber (121) is provided with carrier gas input channel (100), this path (100) communicates with the carrier gas distribution device that the top of reaction chamber (121) is provided with, and is provided with between this carrier gas distribution device and the reaction chamber (121) along the inwall of reaction chamber (121) and enters the inner carrier gas path (141) of reaction chamber (121) from top to bottom;
The inner tubular cavity (21) of described anode component (20) is roughly step-like cylindrical cavity, position near taper hole is a minor diameter elongated hole section, and above-mentioned tubular cavity (21) cooling water cavity (22) is on every side gone up the cooling water path (11) that is provided with anode bodies (10) and is communicated with;
Described cyclonic arrangement comprises that revolves a gas bushing (40), its tube wall is provided with and is communicated with the inside and outside through hole (41) of sleeve pipe, the source of the gas pipeline connection of the outer end of through hole (41) and the starting the arc, commentaries on classics arc gas, introduce along the tangential direction of revolving gas bushing (40) inwall the inner of through hole (41);
Described carrier gas distribution device comprise one communicate with carrier gas input channel (100) be positioned at ring-type carrier gas cavity (142) around the plasma inlet, ring-type carrier gas cavity (142) is communicated with carrier gas path (141), and described carrier gas path (141) is to form by cooperating in the circular clearance mode between the chamber wall of cyclic disk (140) and reaction chamber (121).
2, the system of preparation Nano powder of silicon nitride according to claim 1 is characterized in that: described anode bodies (10) is provided with the adjustment mechanism of tolerance clearance between the conical surface of regulating anode component (20), cathode assembly (30), the taper hole.
3, the system of preparation Nano powder of silicon nitride according to claim 1 and 2, it is characterized in that: the Kong Changyu aperture ratio of the minor diameter elongated hole section in the described tubular cavity (21) is 2～5, described anode bodies (10) is provided with input aperture (12) and two delivery ports (13) of two water coolants, input aperture (12) is corresponding to the position at tolerance clearance place between the conical surface of anode component (20), cathode assembly (30), the taper hole, and two input apertures (12) parallel to each other and reverse tangential direction along anode bodies (10) inner chamber is introduced.
4, the system of preparation Nano powder of silicon nitride according to claim 3, it is characterized in that: two delivery ports (13) lay respectively at and vertical diameter two ends, above-mentioned input aperture (12), be connected with on the described anode bodies (10) and be enclosed within the outside sleeve pipe (50) of anode component (20), the cavity (51) between the outer wall of sleeve pipe (50) and anode component (20) links to each other with cooling water path (11) with above-mentioned tubular cavity (21) respectively and constitutes the path of water coolant.
5, the system of preparation Nano powder of silicon nitride according to claim 2, it is characterized in that: the adjustment mechanism of described tolerance clearance comprises that a local body is positioned at the inner and sleeve pipe relatively-stationary with it (60) of anode bodies (10), the inner end of sleeve pipe (60) is resisted against revolves on the gas bushing (40), cathode assembly (30) links to each other with the inner governor lever (70) that is provided with cooling water channel, governor lever (70) is at sleeve pipe (60) and revolve in gas bushing (40) inner chamber and can move vertically, and the cylindrical outer surface of cathode assembly (30) and revolving has between the gas bushing (40) for the starting the arc, change arc gas and enter anode component (20), path clearance between cathode assembly (30) conical surface.
6, the system of preparation Nano powder of silicon nitride according to claim 1, it is characterized in that: described raw material intake line (150) is provided with several, and be arranged in symmetrically on the contour cross section perpendicular to axial direction, the end that extends the raw material intake line (150) in the reaction chamber (121) is positioned at the below that enters the inlet (122) of reaction chamber (121) near plasma arc, raw material intake line (150) has four, transport to the below of reaction chamber inlet (122) between the outlet of end and the horizontal plane with angle α, wherein 0≤α≤60 °.
7, the system of preparation Nano powder of silicon nitride according to claim 1, it is characterized in that: the apparatus for gas-phase synthesis lower end has a taper transition conduit (161) of changing from small to big to link to each other with separator (160), be connected with the cooling line (173) of horizontal layout on the separator (160), also be provided with a cooling line (171) parallel in cooling line (173) top with cooling line (173), be provided with the vertical cooling line (172) that both are communicated with between the cooling line (171) that one end links to each other with capturing device (180) and the cooling line (173), the lower end of cooling line (172) is provided with detachable end (174).
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| US8575059B1 (en) | 2007-10-15 | 2013-11-05 | SDCmaterials, Inc. | Method and system for forming plug and play metal compound catalysts |
| CN101550600B (en) * | 2009-04-22 | 2011-05-25 | 中国地质大学（北京） | A method to prepare a high-purity high-density monocrystalline silicon nitride nano array |
| SG11201405976RA (en) * | 2012-03-28 | 2014-11-27 | Ube Industries | Silicon nitride powder production method, silicon nitride powder, silicon nitride sintered body and circuit substrate using same |
| RU2015143900A (en) * | 2013-03-14 | 2017-04-19 | ЭсДиСиМАТИРИАЛЗ, ИНК. | HIGH-PERFORMANCE SYSTEM FOR PRODUCING PARTICLES USING PLASMA |
| CA2926133A1 (en) | 2013-10-22 | 2015-04-30 | SDCmaterials, Inc. | Catalyst design for heavy-duty diesel combustion engines |
| CN103945629A (en) * | 2014-04-28 | 2014-07-23 | 昆明冶金高等专科学校 | Multifunctional plasma material preparation system |
| CN113056080A (en) * | 2021-03-17 | 2021-06-29 | 合肥中航纳米技术发展有限公司 | Plasma arc vapor phase method production system for preparing nano powder |
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| CN2413467Y (en) * | 1999-09-10 | 2001-01-03 | 北京航空工艺研究所 | Plasma generator for spraaying technology |
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