CN105135873B - Dynamic pressure electric pulse double-field control sintering furnace and sintering method - Google Patents
Dynamic pressure electric pulse double-field control sintering furnace and sintering method Download PDFInfo
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- CN105135873B CN105135873B CN201510473828.3A CN201510473828A CN105135873B CN 105135873 B CN105135873 B CN 105135873B CN 201510473828 A CN201510473828 A CN 201510473828A CN 105135873 B CN105135873 B CN 105135873B
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Abstract
The invention relates to a dynamic pressure electric pulse double-field control sintering furnace and a sintering method. The sintering furnace comprises a furnace body, a dynamic pressure system, a pulse current generator and a sintering controller. The furnace body is connected with the dynamic pressure system and the pulse current generator. The dynamic pressure system and the pulse current generator are both connected to the sintering controller. A die is arranged in the furnace body. The dynamic pressure system comprises an upper press head electrode, a lower press head electrode, an upper press head, a lower press head, a constant pressure control module, a dynamic pressure control module and a pressure master control module. The dynamic pressure system is connected with the sintering controller. The pulse current generator is connected with the upper press head electrode and the lower press head electrode and connected with the sintering controller as well. The sintering controller controls the dynamic pressure system and the pulse current generator to generate the adjustable dynamic pressure for a material to be sintered and conduct plasma pulse current sintering on the material to be sintered. The dynamic pressure electric pulse double-field control sintering furnace and the sintering method can be widely applied to sintering of the high-performance material.
Description
Technical field
The present invention relates to a kind of sintering furnace and sintering method, especially with regard to a kind of double field control sintering of dynamic pressure electric pulse
Stove and sintering method.
Background technology
Sintering process in advanced material preparation process is to realize granule densification, give the key step of mechanical strength
Suddenly.The fusing point of ceramics and some metal materials is higher, it tends to be difficult to realize sintering densification, therefore agglomerating plant and technology are carried
Higher requirement is gone out.
At present conventional sintering method includes that normal pressure-sintered, two kinds of hot pressed sintering and discharge plasma are sintered.Normal pressure burns
Knot is simple high temperature sintering methods, promotes densifying materials by heating at atmosheric pressure, and the densification degree of material is not
It is high.Hot pressed sintering is while sintering, to powder unidirectional or two-way pressure to be applied, and accelerates densification process, is compared often
Pressure sintering, the temperature of hot pressed sintering is lower, and sintering time is shorter, can be effectively promoted the densification of material, suppress crystal grain long
Greatly, current application includes advanced ceramics, hard alloy, powder metallurgy and composite etc..Discharge plasma burns
Knot is a kind of new material sintering preparation method developed in recent years, also known as pulse electric current sintering.The main spy of the technology
Point is that DC pulse current is passed through to electrode, instantaneously produces discharge plasma, and effectively utilizes pulse current and granule itself are sent out
Thermogenetic surface activation, realizes the supper-fast densification sintering of material, substantially reduces sintering time, reduces sintering temperature
Degree, but pulse current has strong directivity and polarity, causes the material after sintering along occurring property of current electric fields direction
Energy skewness, affects the use of material.Research shows that the pressure that current agglomerating plant is provided is constant pressure, permanent
The lower granule of constant-pressure effect is difficult to sliding rearrangement, pore and is difficult to discharge, and " hard aggregation " is also easy to produce between granule in sintering process, holds
The non-uniform phenomenon of microstructure is easily caused, therefore constrains the degree of sintered body densification and the raising of mechanical property, and,
Powder body shrinks in sintering process, the situation of densifying materials cannot be grasped in time, so as to constrain the sintering of high performance material.
The content of the invention
For the problems referred to above, it is an object of the invention to provide one kind can effectively improve in discharge plasma sintering occurring
Electric field and temperature field non-uniform phenomenon so that electric field and dynamic force field reduce and eliminate " hard group in controllable change
It is poly- ", material quick densifying at a lower temperature is realized, improve powder bulk density, promote pore to discharge, so as to prepare height
The double field control sintering furnaces of the dynamic pressure electric pulse of the high-quality performance materials such as density, low defect, high intensity and sintering method.
For achieving the above object, the present invention takes technical scheme below：A kind of double field control sintering furnaces of dynamic pressure electric pulse,
It is characterized in that：It includes body of heater, dynamic pressure system, impulse current generator and sintering controller；The body of heater connects institute
Dynamic pressure system and the impulse current generator are stated, the dynamic pressure system and the impulse current generator all connect
The sintering controller；
The furnace interior is provided with mould, and the mould is using the column structure with hollow cavity；
The dynamic pressure system includes seaming chuck electrode, pushes tip electrode, seaming chuck, push-down head, constant pressure control
Module, dynamic pressure control module and pressure top control module；The seaming chuck electrode, the tip electrode that pushes are separately fixed at institute
State upper of furnace body and the lower portion of furnace body；Described seaming chuck one end connects the seaming chuck electrode base, and other end insertion is described
Mould hollow cavity top；Tip electrode is pushed described in push-down head one end connection, the other end inserts the mould hollow cavity
Bottom, and the seaming chuck end in the mould hollow cavity and described pushing treat with receiving between cephalic par
The space of sintered material；The seaming chuck top of electrodes and the constant pressure control module and the dynamic pressure control module
Connection, the constant pressure control module and the dynamic pressure control module are connected to the pressure top control module；It is described
Pressure top control module connection it is described sintering controller outfan, the sintering controller by dynamic pressure control signal send to
The pressure top control module, the pressure top control module controls the constant pressure according to the dynamic pressure control signal for receiving
The dynamic pressure that the constant pressure and the dynamic pressure control module that control module is produced is produced is superposed to a frequency and shakes
Adjustable dynamic pressure acts on the seaming chuck electrode, and then controls the seaming chuck by the seaming chuck electrode and treat
Sintered material produces the adjustable dynamic pressure of size.
The outfan of the impulse current generator connects the seaming chuck electrode and described pushes tip electrode, the pulse
The input of current feedback circuit is connected to the outfan of the sintering controller, and the sintering controller believes pulse current control
Number send to the impulse current generator, the impulse current generator is according to the pulse current control signal for receiving to institute
Stating seaming chuck electrode and the tip electrode that pushes carries out plasma pulse electric current sintering, and plasma pulse electric current is by the upper pressure
Tip electrode, tip electrode, the seaming chuck and the push-down head of pushing act on material to be sintered.
The double field control sintering furnaces of the dynamic pressure electric pulse also include cooling water system, and the cooling water system includes water-cooled
Passage and cooling water control system, the water-cooling channel is located at the furnace interior and near the body of heater wall, the water-cooled
The outlet of passage is arranged on the body of heater upper end, and the water inlet of the water-cooling channel is arranged on the body of heater lower end, the water
Cooling water control system described in the water inlet Jing of cold passage connects the sintering controller, and the sintering controller will cool down water control
Signal processed is sent to the cooling water control system, and the cooling water control system is according to the cooling water control signal control for receiving
Make flowing in and out for cooling water in the water-cooling channel.
The double field control sintering furnaces of the dynamic pressure electric pulse also include magnetic grid linear movement measuring system, the magnetic grid displacement of the lines
Measuring system includes magnetic head, magnetic grid linear movement pick-up and displacement display, pressure of the magnetic head in the seaming chuck electrode
Axial displacement signal is gathered on point, the axial displacement signal of acquisition is transferred to into the magnetic grid linear movement pick-up, the magnetic grid
The axial displacement data for collecting are delivered to institute's displacement display and are shown in real time by linear movement pick-up.
The double field control sintering furnaces of the dynamic pressure electric pulse also include vacuum-control(led) system, vacuum control described in the body of heater Jing
System processed connects the sintering controller, and the sintering controller sends vacuum control signal to the vacuum-control(led) system,
The vacuum-control(led) system adjusts the vacuum in the body of heater according to the vacuum control signal for receiving；The vacuum control system
System includes mechanical pump, lobe pump, pressure vacuum gauge and electromagnetic valve.
The mould adopts carbon/carbon compound material.
The dynamic pressure magnitude range that the dynamic pressure control module is produced is 0～5MPa, adjustable frequency scope is 0～
3Hz。
The sintering method of sintering furnace is controlled in a kind of double fields of use dynamic pressure electric pulse, comprises the following steps：
1) power supply, water source and vacuum are detected, material to be sintered is positioned over into intracavity in the hollow bulb of body of heater inner mold；
2) vacuum controlled in body of heater by vacuum-control(led) system reaches the vacuum during material technology to be sintered is required；
3) dynamic of dynamic pressure systemic effect frequency and amplitude needed for material to be sintered is controlled by sintering controller
Pressure, dynamic pressure promotes the particle re-arrangement of material to be sintered, so as to improve the green density of material to be sintered；
4) while sintered material effect dynamic pressure is treated, by sintering controller impulse current generator pair is controlled
Material to be sintered carries out plasma pulse electric current sintering so that material to be sintered is subject to dynamic pressure and plasma pulse electricity simultaneously
Double fields control comprehensive function of stream；
5) according to material to be sintered is temperature required and its technological requirement time, after material to be sintered reaches temperature required,
Material technology to be sintered is kept to want seeking time；
6) after material technology to be sintered wants seeking time to reach, cooling water in water-cooling channel is controlled by cooling water system and is entered
Enter and discharge, and then slow cooling is carried out to body of heater；It is slow to reduce dynamic simultaneously by sintering controller control pressure top control module
State pressure is until dynamic pressure is zero；
7) after the temperature cooling in body of heater reaches room temperature, sintering is completed, and sintered body is taken out from body of heater.
Due to taking above technical scheme, it has advantages below to the present invention：1st, the present invention using pulse current due to being sent out
Raw device treats sintered material and carries out plasma pulse electric current sintering, and treats sintered material applying one by dynamic pressure system
Double fields control comprehensive function of dynamic pressure, dynamic pressure and plasma pulse electric current can be substantially reduced needed for material to be sintered
Sintering temperature and sintering time, particle re-arrangement, particle migration and the pore for promoting material to be sintered is discharged, and accelerates material to be sintered
Volume contraction, reduce and eliminate " hard aggregation " so as to can quick densifying, eliminate pore, the defect such as micro-crack, carry significantly
The sintered density and performance of high product.2nd, the present invention makes due to producing dynamic pressure using constant pressure and dynamic pressure superposition
Dynamic pressure frequency and the equal controllable of size that material to be sintered is obtained are obtained, the technological requirement of material to be sintered is met.To sum up institute
State, the present invention can be widely applied in the sintering process for prepare high performance material.
Description of the drawings
Fig. 1 is the schematic diagram that sintering furnace is controlled in the double fields of dynamic pressure electric pulse of the present invention
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
As shown in figure 1, the present invention provides a kind of dynamic pressure electric pulse double field control sintering furnaces, it includes body of heater 1, dynamic pressure
Force system 2, impulse current generator 3 and sintering controller 4.The connection dynamic pressure of body of heater 1 system 2 and impulse current generator 3,
Dynamic pressure system 2 and impulse current generator 3 all connect sintering controller 4.
Body of heater 1 is internally provided with mould 11, and mould 11 is placed using the column structure with hollow cavity, material to be sintered
In the hollow cavity of mould 11.
Dynamic pressure system 2 includes seaming chuck electrode 21, pushes tip electrode 22, seaming chuck 23, push-down head 24, constant pressure
Control module 25, dynamic pressure control module 26 and pressure top control module 27.Seaming chuck electrode 21, to push tip electrode 22 solid respectively
The upper and lower of body of heater 1 is scheduled on, the one end of seaming chuck 23 connects the bottom of seaming chuck electrode 21, the other end insertion hollow cavity of mould 11
Top；The connection of the one end of push-down head 24 pushes tip electrode 22, and the other end inserts hollow cavity bottom, and hollow interior positioned at mould 11
There is the space for accommodating material to be sintered between the end of seaming chuck 23 and the end of push-down head 24 in chamber.The top of seaming chuck electrode 21
It is connected with constant pressure control module 25 and dynamic pressure control module 26, constant pressure control module 25 and dynamic pressure are controlled
Module 26 is connected to pressure top control module 27.The outfan of the connection sintering controller 4 of pressure top control module 27, sinters controller
4 send dynamic pressure control signal to pressure top control module 27, and pressure top control module 27 is according to the dynamic pressure control for receiving
The dynamic pressure that the constant pressure and dynamic pressure control module 26 that signal control constant pressure control module 25 processed is produced is produced
The dynamic pressure for being superposed to a frequency and adjustable amplitude acts on seaming chuck electrode 21, and then is controlled by seaming chuck electrode 21
Seaming chuck 23 treats sintered material and produces the adjustable dynamic pressure of size.
The outfan of impulse current generator 3 connects seaming chuck electrode 21 and pushes tip electrode 22, impulse current generator 3
Input be connected to sintering controller 4 outfan, sintering controller 4 pulse current control signal is sent to pulse current
Generator 3, impulse current generator 3 is according to the pulse current control signal for receiving is to seaming chuck electrode 21 and pushes tip electrode
22 carry out plasma pulse electric current sintering, and plasma pulse electric current passes through seaming chuck electrode 21, seaming chuck 23, pushes tip electrode 22
With push-down head 24, discharge plasma is instantaneously produced when reaching material to be sintered, make material to be sintered itself produce Joule heat simultaneously
The surface particles for making material to be sintered are activated, and produced energy is transmitted between the granule of material to be sintered, are accelerated energy and are being treated
Diffusion between sintered material so that material to be sintered is subject to the comprehensive work of double fields control of dynamic pressure and plasma pulse electric current simultaneously
With.
In above-described embodiment, the double field control sintering furnaces of dynamic pressure electric pulse also include cooling water system, cooling water system bag
Water-cooling channel 51 and cooling water control system 52 are included, water-cooling channel 51 is located at the inside of body of heater 1 and near the wall of body of heater 1, and water-cooled is led to
The outlet 53 in road 51 is arranged on the upper end of body of heater 1, and the water inlet 54 of water-cooling channel 51 is arranged on the lower end of body of heater 1, water-cooling channel 51
54 Jing cooling water control systems of water inlet 52 connection sintering controller 4, sintering controller 4 by cooling water control signal send to
Cooling water control system 52, cooling water control system 52 is according to cold in the cooling water control signal control water-cooling channel 51 for receiving
But water is flowed in and out.
In above-described embodiment, the double field control sintering furnaces of dynamic pressure electric pulse also include magnetic grid linear movement measuring system 6, magnetic grid
Linear movement measuring system 6 includes magnetic head 61, magnetic grid linear movement pick-up 62 and displacement display 63, and magnetic head 61 is directly in seaming chuck
Axial displacement signal is gathered on the pressure spot of electrode 21, the axial displacement signal of acquisition is transferred to into magnetic grid linear movement pick-up
62, the axial displacement data for collecting are delivered to displacement display 63 and are shown in real time by magnetic grid linear movement pick-up 62.
In above-described embodiment, the double field control sintering furnaces of dynamic pressure electric pulse also include vacuum-control(led) system 7, and Jing is true for body of heater 1
The connection sintering controller 4 of empty control system 7, sintering controller 4 sends vacuum control signal to vacuum-control(led) system 7, vacuum
Control system 7 adjusts the vacuum in body of heater 1 according to the vacuum control signal that receives, vacuum-control(led) system 7 include mechanical pump,
Lobe pump, pressure vacuum gauge and electromagnetic valve.
In above-described embodiment, mould 11 can bear high frequency dynamic using the higher carbon/carbon compound material of toughness and intensity
Pressure constant impingement, usage cycles are long.
In above-described embodiment, dynamic pressure control module 26 produce dynamic pressure magnitude range be 0～5MPa, Frequency Adjustable
Rate scope is 0～3Hz.
The present invention also provides a kind of dynamic pressure electric pulse double field control sintering methods, comprises the following steps：
1) power supply, water source and vacuum are detected, material to be sintered is positioned over into intracavity in the hollow bulb of mould 11.
2) vacuum controlled in body of heater 1 by vacuum-control(led) system 7 reaches the vacuum during material technology to be sintered is required
Degree.
3) the dynamic of frequency needed for material to be sintered and amplitude is acted on by sintering controller 4 and control dynamic pressure system 2
State pressure, dynamic pressure promotes the particle re-arrangement of material to be sintered, so as to improve the green density of material to be sintered.
4) while sintered material effect dynamic pressure is treated, by sintering controller 4 impulse current generator 3 is controlled
Treating sintered material carries out plasma pulse electric current sintering so that material to be sintered is subject to dynamic pressure and plasma pulse simultaneously
Double fields control comprehensive function of electric current.
5) according to material to be sintered is temperature required and its technological requirement time, after material to be sintered reaches temperature required,
Material technology to be sintered is kept to want seeking time.
6) after material technology to be sintered wants seeking time to reach, cooling water in water-cooling channel 51 is controlled by cooling water system
Inlet and outlet, and then slow cooling is carried out to body of heater 1；Simultaneously by sintering the control pressure top control module 27 of controller 4, slowly
Dynamic pressure is reduced until dynamic pressure is zero.
7) after the temperature cooling in body of heater 1 reaches room temperature, sintering is completed, and sintered body is taken out from body of heater 1.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each part, connected mode and processing technology etc. are all
Can be what is be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement should not be excluded
Outside protection scope of the present invention.
Claims (10)
1. sintering furnace is controlled in a kind of double fields of dynamic pressure electric pulse, it is characterised in that：It includes body of heater, dynamic pressure system, pulse
Current feedback circuit and sintering controller；The body of heater connects the dynamic pressure system and the impulse current generator, described
Dynamic pressure system and the impulse current generator all connect the sintering controller；
The furnace interior is provided with mould, and the mould is using the column structure with hollow cavity；
The dynamic pressure system include seaming chuck electrode, push tip electrode, seaming chuck, push-down head, constant pressure control module,
Dynamic pressure control module and pressure top control module；The seaming chuck electrode, the tip electrode that pushes are separately fixed at the stove
Body top and the lower portion of furnace body；Described seaming chuck one end connects the seaming chuck electrode base, and the other end inserts the mould
Hollow cavity top；Tip electrode is pushed described in push-down head one end connection, the other end inserts the mould hollow cavity bottom,
And the seaming chuck end in the mould hollow cavity and it is described push between cephalic par have accommodate it is to be sintered
The space of material；The seaming chuck top of electrodes connects with the constant pressure control module and the dynamic pressure control module
Connect, the constant pressure control module and the dynamic pressure control module are connected to the pressure top control module；The pressure
The outfan of the power top control module connection sintering controller, the sintering controller sends dynamic pressure control signal to institute
Pressure top control module is stated, the pressure top control module controls the constant pressure control according to the dynamic pressure control signal for receiving
The dynamic pressure that the constant pressure and the dynamic pressure control module that molding block is produced is produced is superposed to a frequency and amplitude
Adjustable dynamic pressure acts on the seaming chuck electrode, and then treats burning by the seaming chuck electrode control seaming chuck
Knot material produces the adjustable dynamic pressure of size.
2. sintering furnace is controlled in a kind of double fields of dynamic pressure electric pulse as claimed in claim 1, it is characterised in that：The pulse current
The outfan of generator connect the seaming chuck electrode and it is described push tip electrode, the input of the impulse current generator connects
The outfan of the sintering controller is connected to, the sintering controller sends pulse current control signal to the pulse current
Generator, the impulse current generator according to the pulse current control signal for receiving to the seaming chuck electrode and it is described under
Pressure head electrode carries out plasma pulse electric current sintering, and plasma pulse electric current is by the seaming chuck electrode, push-down head electricity
Pole, the seaming chuck and the push-down head act on material to be sintered.
3. sintering furnace is controlled in a kind of double fields of dynamic pressure electric pulse as claimed in claim 1 or 2, it is characterised in that：The dynamic
The double field control sintering furnaces of pressure electric pulse also include cooling water system, and the cooling water system includes water-cooling channel and cooling water control
System, the water-cooling channel is located at the furnace interior and near the body of heater wall, and the outlet of the water-cooling channel is arranged
In the body of heater upper end, the water inlet of the water-cooling channel is arranged on the body of heater lower end, the water inlet Jing of the water-cooling channel
The cooling water control system connects the sintering controller, and the sintering controller sends cooling water control signal to described
Cooling water control system, the cooling water control system is controlled in the water-cooling channel according to the cooling water control signal for receiving
Cooling water is flowed in and out.
4. sintering furnace is controlled in a kind of double fields of dynamic pressure electric pulse as claimed in claim 1 or 2, it is characterised in that：The dynamic
The double field control sintering furnaces of pressure electric pulse also include magnetic grid linear movement measuring system, and the magnetic grid linear movement measuring system includes magnetic
Head, magnetic grid linear movement pick-up and displacement display, the magnetic head gathers axial position on the pressure spot of the seaming chuck electrode
Shifting signal, by the axial displacement signal of acquisition the magnetic grid linear movement pick-up is transferred to, and the magnetic grid linear movement pick-up will
The axial displacement data for collecting are delivered to institute's displacement display and are shown in real time.
5. sintering furnace is controlled in a kind of double fields of dynamic pressure electric pulse as claimed in claim 3, it is characterised in that：The dynamic pressure
The double field control sintering furnaces of electric pulse also include magnetic grid linear movement measuring system, and the magnetic grid linear movement measuring system includes magnetic head, magnetic
Grid line displacement transducer and displacement display, the magnetic head gathers axial displacement letter on the pressure spot of the seaming chuck electrode
Number, the axial displacement signal of acquisition is transferred to into the magnetic grid linear movement pick-up, the magnetic grid linear movement pick-up will be gathered
To axial displacement data be delivered to institute's displacement display and shown in real time.
6. a kind of double field control sintering furnaces of dynamic pressure electric pulse as described in claim 1 or 2 or 5, it is characterised in that：It is described dynamic
The double field control sintering furnaces of state pressure electric pulse also include vacuum-control(led) system, and vacuum-control(led) system connection is described described in the body of heater Jing
Sintering controller, the sintering controller sends vacuum control signal to the vacuum-control(led) system, the vacuum control system
System adjusts the vacuum in the body of heater according to the vacuum control signal for receiving；The vacuum-control(led) system include mechanical pump,
Lobe pump, pressure vacuum gauge and electromagnetic valve.
7. sintering furnace is controlled in a kind of double fields of dynamic pressure electric pulse as claimed in claim 3, it is characterised in that：The dynamic pressure
The double field control sintering furnaces of electric pulse also include vacuum-control(led) system, the sintering control of vacuum-control(led) system connection described in the body of heater Jing
Device processed, the sintering controller sends vacuum control signal to the vacuum-control(led) system, the vacuum-control(led) system according to
The vacuum control signal for receiving adjusts the vacuum in the body of heater；The vacuum-control(led) system include mechanical pump, lobe pump,
Pressure vacuum gauge and electromagnetic valve.
8. a kind of double field control sintering furnaces of dynamic pressure electric pulse as described in claim 1 or 2 or 5 or 7, it is characterised in that：Institute
State mould and adopt carbon/carbon compound material.
9. a kind of double field control sintering furnaces of dynamic pressure electric pulse as described in claim 1 or 2 or 5 or 7, it is characterised in that：Institute
The dynamic pressure magnitude range for stating the generation of dynamic pressure control module is 0～5MPa, and adjustable frequency scope is 0～3Hz.
10. the sintering side of sintering furnace is controlled in a kind of double fields of dynamic pressure electric pulse using as any one of claim 1～9
Method, comprises the following steps：
1) power supply, water source and vacuum are detected, material to be sintered is positioned over into intracavity in the hollow bulb of body of heater inner mold；
2) vacuum controlled in body of heater by vacuum-control(led) system reaches the vacuum during material technology to be sintered is required；
3) dynamic pressure of dynamic pressure systemic effect frequency and amplitude needed for material to be sintered is controlled by sintering controller,
Dynamic pressure promotes the particle re-arrangement of material to be sintered, so as to improve the green density of material to be sintered；
4) while sintered material effect dynamic pressure is treated, by sintering controller control impulse current generator burning is treated
Knot material carries out plasma pulse electric current sintering so that material to be sintered is subject to dynamic pressure and plasma pulse electric current simultaneously
Double control comprehensive functions；
5) according to material to be sintered is temperature required and its technological requirement time, after material to be sintered reaches temperature required, keep
Material technology to be sintered wants seeking time；
6) after material technology to be sintered wants seeking time to reach, by cooling water system control water-cooling channel in cooling water entrance and
Discharge, and then slow cooling is carried out to body of heater；It is slow to reduce dynamic pressure simultaneously by sintering controller control pressure top control module
Power is until dynamic pressure is zero；
7) after the temperature cooling in body of heater reaches room temperature, sintering is completed, and sintered body is taken out from body of heater.
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| CN203938607U (en) * | 2014-01-14 | 2014-11-12 | 苏州永佳超硬耐磨材料有限公司 | A kind of stupalith sintering oven |
| CN203810898U (en) * | 2014-04-16 | 2014-09-03 | 昆明理工大学 | Microwave vacuum hot pressing furnace |
| CN204449297U (en) * | 2015-01-05 | 2015-07-08 | 深圳市新泰兴精密科技有限公司 | A kind of powder metallurgy discharge plasma sintering system |
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