CN201707394U - Device for testing specific resistance of metal melt - Google Patents
Device for testing specific resistance of metal melt Download PDFInfo
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- CN201707394U CN201707394U CN2010201209539U CN201020120953U CN201707394U CN 201707394 U CN201707394 U CN 201707394U CN 2010201209539 U CN2010201209539 U CN 2010201209539U CN 201020120953 U CN201020120953 U CN 201020120953U CN 201707394 U CN201707394 U CN 201707394U
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Abstract
The utility model discloses a device for testing specific resistance of metal melt and a testing method. The device comprises a sample positioning device, a gas protection system which accommodates the sample positioning device to form gas tight protection and is provided with a heating device, and an electrical property testing system used for testing electrical property of a sample in the sample positioning device; the electrical property testing system comprises four electrodes and a thermocouple; the sample positioning device comprises a crucible provided with a cover body and used for accommodating the sample, and a ceramic boat serving as a carrier of the crucible; the crucible is positioned in the preset position of the ceramic boat; the cover body is provided with holes used for positioning the four electrodes on the plane surface of the cover body; the ceramic boat is provided with holes used for positioning the thermocouple; and a bracket is arranged on the ceramic boat and used for fixing and positioning conducting wires of the four electrodes. The scheme has the advantages of high measuring accuracy and wide range of application temperature.
Description
Technical field
The utility model relates to a kind of device of testing metal bath resistivity, belongs to a kind of device of four electrode method test metal bath resistivity.
Background technology
Casting alloy is shaped and is meant that alloy is by the process of liquid state to solid state transformation.Melt as the foundry goods original state, exist necessary relation between the performance of the foundry goods of its structure, performance and state and its final molding, just the above-mentioned key element of liquid melts has direct influence to casting quality, often its some characteristics can be genetic to solid-state in the middle of.Therefore, the research of alloy melt structure has been subjected to domestic and international material field scholar's very big attention.Simultaneously, as the field, an aspect of Condensed Matter Physics and metal material, the research of the liquid character of alloy material is also carried out.
The research method of liquid metal structure mainly contains direct test, Theoretical Calculation and physical property measurement.Directly test mainly contains melt X-ray diffraction, electronics and neutron diffraction and synchrotron radiation technology.Responsive physical property of some structures of liquid metal and melt structure are closely bound up, and the variation of macroscopical physical property is the external manifestation of melt microstructure change.The responsive physical property of structure mainly contains melt viscosity, density, resistivity and thermoelectrical potential test or the like.
Resistivity can reflect micromechanism, electronics and the interatomic interaction potential energy and the electronic state etc. of alloy melt as the character of alloy melt electricity aspect.Therefore, Chinese scholars have been launched test widely to the resistivity of alloy melt.
Because the signal that melt structure changes is faint, the beta alloy melt has high temperature, easy oxidized and contaminated characteristics simultaneously, and this just requires the resistivity measurement device to have characteristics high temperature resistant, highly sensitive, data stabilization.The method of the test of adopting mainly contains four electrode method (direct method) and two kinds of methods of Rotational magnetic field method (indirect method) at present.
The four electrode method principle is based on Ohm law, promptly under galvanostatic conditions, measures the voltage drop of liquid metal in the container of known length and sectional area, and then obtains the resistivity of liquid metal.The four electrode method device is simpler, thereby is widely used.The most critical issue that adopts four electrode method to exist is: how to choose the material of container and probe, the accurate location of the placement of bath sample and potential electrode probe is to guarantee measuring stability and precision.China No. 952030004, is called " the resistivity measurement device of horizontally-arranged do not become rusty steel Rong attitude metal and alloy " utility model patent just based on typical four electrode method, the material that its main body adopted remains high temperature resistant limited stainless steel and is made, stainless steel be higher than five or six hundred the degree will occur the distortion, and can pollute the test metal, this temperature that has just limited the measuring object of this measurement mechanism can not be too high.Its positioning of electrode poor stability, the precision that influence is measured.Simultaneously, in this scheme, sample is unfixed, also can influence measuring accuracy.
The rotating magnetic field ratio juris is, the moment of torsion that columniform sample is subjected in rotating magnetic field is directly proportional with the inverse of its resistance.It is contaminated that the advantage of this method is that tested material is difficult for.Its shortcoming is to know earlier the data such as density of liquid metal, and when calculating the resistance of liquid metal alloy, must carry out certain correction to experimental data, experimental technique and equipment complexity.
At present, at home and abroad there is no commercialization high-temperature fusant resistivity meter.Some research units need develop some devices voluntarily for experimental study and use, and still the deficiency that exists is the easy oxidation stain of complicated operation, test sample, measuring accuracy is low, cost is high, can not satisfy our requirement of experiment.
Summary of the invention
In view of this, the purpose of this utility model is to provide the device of the wide test metal bath resistivity of a kind of measuring accuracy height and Applicable temperature scope.
The device of the utility model test metal bath resistivity; comprise the sample locating device; hold this sample locating device to form the gas protection system that has heating arrangement of airtight protection; and the electric performance test system that the sample in the described sample locating device is carried out electric performance test; wherein the electric performance test system comprises four electrodes and thermopair; described sample locating device comprise one have lid be used to hold the crucible of sample and as the ceramic boat of this crucible carrier; the front end face of wherein said crucible is positioned the front panel inner side end of described ceramic boat; and described lid is provided with and is used for the hole of described four electrodes in the lid plane positioning; ceramic boat then is provided with the hole that is used for the thermopair location; and ceramic boat is provided with support, with the fixing and location of the lead that is used for described four electrodes.
Be embodied on the location to the location of sample and corresponding electrode, galvanic couple based on its main improvement of device of the test metal bath resistivity of technical solutions of the utility model, those skilled in the art can survey other auxiliary equipment of metal bath resistance device in conjunction with known four electrode method according to first aspect of the present utility model and be used in combination.
The device of above-mentioned test metal bath resistivity is accurately located electrode by the mode of prefabricated pilot hole on the lid of crucible, simultaneously in order to make electrode position more stable, the use support is fixed its lead and is located, and makes the location of electrode and fixed precision improve greatly.In addition, the existence of ceramic boat then makes the location of crucible more accurate, and has also guaranteed the relative stability of electrode and lead thereof, and ceramic boat and crucible, electrode and lead, galvanic couple can be moved by integral body, and relative position is reliable and stable basically.Thereby, guaranteed the precision of measuring.
The utility model has adopted stupalith to carry out test electrode location and as the carrier of cabling, good insulation preformance, and heat resistance is good, and the Applicable temperature scope improves greatly.
The device of above-mentioned test metal bath resistivity, described support is provided with delegation vertically in the part that described ceramic boat is positioned at the crucible rear side, and each support is provided with and is used for that described lead passes and the hole that forms the location makes four introducings that lead is parallel; Described ceramic boat rear panel has the hole that described thermopair is introduced.
The device of above-mentioned test metal bath resistivity; described gas protection system comprises a tubular type furnace chamber that holds described sample locating device, is connected to vacuum pump on this tubular type furnace chamber by switch, and is connected to inert gas container on the tubular type furnace chamber by switch.
The furnace chamber gland bonnet that the device of above-mentioned test metal bath resistivity, described tubular type furnace chamber are used to put into the end of described sample locating device is provided with the binding post of drawing electric performance test system lead.
The device of above-mentioned test metal bath resistivity serves as that the main pumped vacuum systems that makes up is provided with vacuum meter with described vacuum pump, and pumped vacuum systems and inert gas container are by three-way diverter valve access tubular type furnace chamber.
Description of drawings
Below in conjunction with Figure of description the technical solution of the utility model is further elaborated, wherein:
Fig. 1 is a kind of structural representation of the utility model embodiment high-temperature fusant resistivity measurement device.
Fig. 2 is the partial sectional view of the wiring layout of sample fixing device in the tubular type furnace chamber.
Fig. 3 is the assembling stereogram of crucible and ceramic boat
Fig. 4 is the assembling front view of crucible and ceramic boat.
Fig. 5 is the stereographic map of alumina crucible.
Fig. 6 is the side view of alumina crucible.
Fig. 7 is the stereographic map of alumina crucible lid.
Fig. 8 is the side view of aluminium oxide pot cover.
Fig. 9 is the pure indium metal melt resistivity-thetagram that utilizes the test of embodiment technical scheme.
Among the figure: 1-1, stop valve one, 1-2, total power switch, 1-3, heating operation key, 1-4, the heating stop key, 1-5, vacuum pump switch, 1-6, stop valve two, 1-7, flowmeter, 1-8, electron vacuum gage, 1-9, argon gas source, 1-10, computing machine, 1-11, nanovoltmeter, 1-12, dc constant current power supply, 1-13, the tubular type furnace chamber, 1-14, heating furnace body, 1-15, circulating water pipeline, 1-16, threeway, 1-17, vacuum pump, 1-18, relay, 2-1, tungsten galvanic electrode one, 2-2, tungsten voltage electrode one, 2-3, tungsten voltage electrode two, 2-4, tungsten galvanic electrode two, 2-5, thermopair, 2-6, support, 2-7, ceramic boat, 2-8, crucible, 2-9, the tubular type furnace chamber, 2-10, outer terminal, 2-11, the furnace chamber gland bonnet, 3-1, crucible, 3-2, ceramic boat, 3-3, the hole, 3-4, support.
Represent explanation about width of cloth figure: in different figure, representing that the mark of same parts has adopted different marker methods, mainly is in order to distinguish each several part mechanism, to help those skilled in the art's reference.
Embodiment
With reference to Figure of description 2; it shows the device of test metal bath resistivity; comprise the sample locating device; hold the gas protection system that has heating arrangement that this sample locating device forms airtight protection; and the electric performance test system that the sample in the described sample locating device is carried out electric performance test; wherein the electric performance test system comprises four electrode 2-1; 2-2; 2-3; 2-4 and thermopair 2-5; described sample locating device comprise one have lid be used to hold the crucible 2-8 of sample and as the ceramic boat 2-7 of this crucible carrier; the front end face of wherein said crucible is positioned the front panel inner side end of described ceramic boat; and described lid is provided with and is used for the hole of described four electrodes in the lid plane positioning; ceramic boat then is provided with the hole 3-3 that is used for the thermopair location; and ceramic boat is provided with support 2-6, with the fixing and location of the lead that is used for described four electrodes.
Said lead is preferably used copper cash, and heat resistance is good, the conductance height.
With reference to Figure of description 1, said electric performance test device can adopt in the positive and negative opposition method of present four electrodes the proving installation that generally adopts, the computing machine 1-10 that mainly comprises the nanovoltmeter 1-11 that gathers described four electrode voltages, this nanovoltmeter output signal is handled and shown, the tributary constant current source 1-12 of control heating and the relay 1-18 on this heater circuit.
Show a kind of simple locator meams with reference to Figure of description 3 and accompanying drawing 4, described ceramic boat is a boat shape body, and described crucible front end face is positioned the front panel inner side end of described ceramic boat.Nature, the ceramic boat here itself may not be the shape of boat, the bottom of ceramic boat can guarantee to locate in gas protection system in theory, can adopt imitated structure or other rock-steady structure.
Show support 3-4 with reference to Figure of description 3 and accompanying drawing 4 and be provided with delegation vertically in the part that ceramic boat 3-2 is positioned at the crucible rear side, and each support is provided with and is used for that described lead passes and the hole that forms the location, make four introducings that lead is parallel, make cabling easier, and do not disturb each other; Said pilot hole is exactly that the hole that is used to wear same lead is positioned at identical height.At least should be 2 about described support, preferred 3, be convenient to the secure fixation of lead.
Described ceramic boat rear panel has the hole 3-3 that described thermopair is introduced, with the reliable location that is used for thermopair and fixing.
Comprise a tubular type furnace chamber 2-9 who holds described sample locating device, be connected to vacuum pump 1-17 on this tubular type furnace chamber with reference to Figure of description 2 described gas protection system, and be connected to inert gas container on the tubular type furnace chamber by switch by switch.This inert gas container preferably adopts argon gas source 1-9, also can adopt helium gas source.
The furnace chamber gland bonnet 2-11 that a kind of preferred construction, described tubular type furnace chamber are used to put into the end of described sample locating device is provided with the binding post of drawing electric performance test system lead.Said binding post is provided with symmetrically in both ends of the surface, is electrically connected in twos, and like this, external cabling can be directly on outer terminal 2-10, and internal wiring terminal connects described lead, is convenient to the electric connection after lead must locate and fix.
In order to observe the situation that vacuumizes intuitively, serve as that the main pumped vacuum systems that makes up is provided with vacuum meter with described vacuum pump; For the ease of operation, pumped vacuum systems and inert gas container insert the tubular type furnace chamber by three-way diverter valve.
A kind of method of testing, it may further comprise the steps:
A) adopt vacuum melting alloy to be measured, obtain sample;
B) crucible is installed to the ceramic boat precalculated position, sample is placed in the described crucible, reserve electrode position, and then, cover the lid of crucible, electrode is introduced in the crucible by the hole on the lid, thermocouple location is set electrode and lead fixed thereof; Afterwards ceramic boat is put into gas protection system together with crucible;
C) to holding of described gas protection system described style locating device parts be evacuated to predetermined vacuum level;
D) in the parts that vacuumize the filling inert gas to greater than atmospheric pressure;
E) according to preset program sample is heated, and start described electric performance test system sample is tested, until obtaining test data.
In order to improve measuring accuracy, described electric performance test system adopts the positive and negative opposition method of four electrodes to test.The positive and negative electrode switching cycle of the positive and negative opposition method of four electrodes that is adopted is 3-7s, and the switching cycle minimum is 1s.
In order to make measurement result more representative, to make its homogenization of composition by electromagnetic agitation during described sample melting.
Adopt above method of testing, the cycle that electric current is pressed among the 5s switches, to the test result of 420-1100 ℃ of pure indium metal melt as shown in Figure 9.Test result to multiple metal and alloy shows that the alloy melt resistivity error that records is in 0.5%, and probe temperature can be up to 1550 ℃.This high-temperature fusant resistivity test device handled easily to sample and electrode position fixing-stable, has reduced measuring error, and higher vacuum and good gas shield can be provided, and it is wide to measure temperature range.
In addition, can also select or make up following technological means:
-directly insert the alloy to be measured after the melting in the crucible or the sample that is cast into definite shape is positioned in the crucible, the former can be energy-conservation, and the latter is easy to use.For the latter, can after electromagnetic agitation, cast, make the square type standard sample that the length of side is 8mm by machine work.
Claims (5)
1. device of testing metal bath resistivity; comprise the sample locating device; hold this sample locating device to form the gas protection system that has heating arrangement of airtight protection; and the electric performance test system that the sample in the described sample locating device is carried out electric performance test; wherein the electric performance test system comprises four electrodes and thermopair; it is characterized in that: described sample locating device comprise one have lid be used to hold the crucible of sample and as the ceramic boat of this crucible carrier; the front end face of wherein said crucible is positioned the front panel inner side end of described ceramic boat; and described lid is provided with and is used for the hole of described four electrodes in the lid plane positioning; ceramic boat then is provided with the hole that is used for the thermopair location; and ceramic boat is provided with support, with the fixing and location of the lead that is used for described four electrodes.
2. the device of test metal bath resistivity according to claim 1, it is characterized in that: described support is provided with delegation vertically in the part that described ceramic boat is positioned at the crucible rear side, and each support is provided with and is used for that described lead passes and the hole that forms the location makes four introducings that lead is parallel; Described ceramic boat rear panel has the hole that described thermopair is introduced.
3. the device of test metal bath resistivity according to claim 1 and 2; it is characterized in that: described gas protection system comprises a tubular type furnace chamber that holds described sample locating device, is connected to vacuum pump on this tubular type furnace chamber by switch, and is connected to inert gas container on the tubular type furnace chamber by switch.
4. the device of test metal bath resistivity according to claim 3 is characterized in that: the furnace chamber gland bonnet that described tubular type furnace chamber is used to put into the end of described sample locating device is provided with the binding post of drawing electric performance test system lead.
5. the device of test metal bath resistivity according to claim 4 is characterized in that: with described vacuum pump serves as that the main pumped vacuum systems that makes up is provided with vacuum meter, and pumped vacuum systems and inert gas container are by three-way diverter valve access tubular type furnace chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201209539U CN201707394U (en) | 2010-03-02 | 2010-03-02 | Device for testing specific resistance of metal melt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201209539U CN201707394U (en) | 2010-03-02 | 2010-03-02 | Device for testing specific resistance of metal melt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201707394U true CN201707394U (en) | 2011-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201209539U Expired - Lifetime CN201707394U (en) | 2010-03-02 | 2010-03-02 | Device for testing specific resistance of metal melt |
Country Status (1)
| Country | Link |
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| CN (1) | CN201707394U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782544A (en) * | 2010-03-02 | 2010-07-21 | 济南大学 | Device for testing metal melt electrical resistivity and testing method therefor |
| CN106707025A (en) * | 2016-12-06 | 2017-05-24 | 河北工业大学 | Micro-area resistivity measurement device having temperature control function |
-
2010
- 2010-03-02 CN CN2010201209539U patent/CN201707394U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782544A (en) * | 2010-03-02 | 2010-07-21 | 济南大学 | Device for testing metal melt electrical resistivity and testing method therefor |
| CN101782544B (en) * | 2010-03-02 | 2012-09-26 | 济南大学 | Device for testing metal melt electrical resistivity and testing method thereof |
| CN106707025A (en) * | 2016-12-06 | 2017-05-24 | 河北工业大学 | Micro-area resistivity measurement device having temperature control function |
| CN106707025B (en) * | 2016-12-06 | 2024-04-05 | 河北工业大学 | Micro-area resistivity measuring device with temperature control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110112 Effective date of abandoning: 20120926 |