CN114791448A - Novel catalytic element processing method - Google Patents
Novel catalytic element processing method Download PDFInfo
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- CN114791448A CN114791448A CN202210464628.1A CN202210464628A CN114791448A CN 114791448 A CN114791448 A CN 114791448A CN 202210464628 A CN202210464628 A CN 202210464628A CN 114791448 A CN114791448 A CN 114791448A
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- 230000003197 catalytic effect Effects 0.000 title claims abstract description 19
- 238000003672 processing method Methods 0.000 title claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000004804 winding Methods 0.000 claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 24
- 230000032683 aging Effects 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 11
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 8
- 238000007689 inspection Methods 0.000 claims abstract description 7
- 238000011056 performance test Methods 0.000 claims abstract description 7
- 238000012546 transfer Methods 0.000 claims abstract description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 71
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 35
- 239000007789 gas Substances 0.000 claims description 29
- 230000035945 sensitivity Effects 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 18
- 238000011049 filling Methods 0.000 claims description 12
- 239000006260 foam Substances 0.000 claims description 12
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 9
- 238000004513 sizing Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 3
- 230000003203 everyday effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000006213 oxygenation reaction Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 229910052723 transition metal Inorganic materials 0.000 abstract description 4
- 150000003624 transition metals Chemical class 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000007581 slurry coating method Methods 0.000 abstract description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 2
- 229910052697 platinum Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000007809 chemical reaction catalyst Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006298 dechlorination reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/16—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
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- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J33/00—Protection of catalysts, e.g. by coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/33—Electric or magnetic properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
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Abstract
The invention provides a novel catalytic element processing method, and mainly relates to the technical field of catalytic element processing. A novel catalytic element processing method comprises the following steps: the method comprises the steps of coil winding a, inspection b, slurry coating and drying c, sintering d, transfer welding e, pairing f, stability aging test g and performance test h. The invention has the beneficial effects that: the invention adopts the high-activity transition metal alloy catalyst, and removes chloride ions in the manufacturing process, thereby better ensuring the stabilizing effect of the catalyst.
Description
Technical Field
The invention mainly relates to the technical field of catalytic element processing, in particular to a novel catalytic element processing method.
Background
The catalytic element in this application indicates the sensor that is used for catalytic combustion, mainly is applied to combustible gas and detects the trade, puts into oven sintering several hours after traditional aluminium oxide grinds to scribble the thick liquid, soaks and uses high concentration gas activation dechlorination ion to guarantee the stabilization effect manufacturing process of catalyst in putting into the catalyst again after the cooling, and this mode manufacturing procedure is comparatively complicated, and the processing effect is difficult to guarantee.
The existing catalytic element products in the current market have uneven quality and poor use reliability, and the main reason is that the processing technology is lagged behind or needs to be improved.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a novel catalytic element processing method, a catalytic sensor adopts a bridge balance principle, outputs an analog signal, and has the following basic working principle: the method comprises the following steps of wrapping a carrier catalyst form sphere outside a high-purity platinum coil, and under a certain temperature condition, when a combustible gas is in contact with the sphere, the combustible gas and adsorbed oxygen on the surface of the sphere generate violent flameless combustion reaction and release heat, so that the temperature change of the platinum coil is caused, and the resistance of the platinum coil is changed, and the gas concentration can be measured by measuring the resistance change; the novel catalytic element adopts a high-activity transition metal alloy catalyst, and chloride ions are removed in the manufacturing process, so that the stabilizing effect of the catalyst is better ensured.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a novel catalytic element processing method comprises the following steps: the method comprises the steps of coil winding a, inspection b, slurry coating and drying c, sintering d, transfer welding e, pairing f, stability aging test g and performance test h.
The following equipment is required to be used in the scheme: the device comprises a winding machine, a welding machine, a voltage testing machine, a constant temperature machine, a stability box, a pure methane bottle and a 1% CH4 standard gas, wherein the device is conventional technical equipment in the field.
Winding a of the coil:
turning on a power supply of a winding machine and a power supply for annealing, selecting a high-purity platinum wire, adjusting the number of turns according to element parameters, and mounting platinum wires at intervals; clamping the platinum wire end by using a flat-nose tweezers, and winding the platinum wire end on the metal sheet wound on the wall; pressing a working key, automatically rotating 180 degrees around the wall, pressing down the annealing wall, lightly placing on the platinum wire for 2 seconds to enable the platinum wire to glow dark red, and placing down a crochet hook; pressing a working key, and automatically going to the next step around the wall; the position of the crochet needle needs to be adjusted for the first time, so that the platinum wire can just pass through the crochet needle; pressing a working key, automatically starting to wind a coil around the wall, simultaneously polishing the lead of the carrier on metallographic abrasive paper for several times to remove dirt, and placing the carrier on the bearing frame; after the process is finished, pushing the transverse moving block to the position where the lead wire of the carrier and the platinum wire are horizontal, picking up the handheld spot welding gun, slightly pressing the head on the platinum wire, and simultaneously pressing a welding key to weld the platinum wire on the lead wire of the carrier; opening a vibration switch, slightly moving the traverse block, slowly withdrawing the coil out of the mandrel, closing the vibration switch, clamping the platinum wire end by using a flat-nose forceps, and winding the platinum wire end on the metal sheet of the winding wall for 2 circles to start winding a second coil; repeating a2, a3, a4, a5 and a6, and placing the wound coils in a circumference rotating disc; and (5) automatically winding the coil with a determined program.
And b, checking:
and (3) placing the wound coils under an electron microscope to check one by one, wherein the following requirements are that: the coil length is 14 grids +/-1 grid, and the length of the clamped wire is as follows: 12.5-13 cases; and transferring the qualified coils to the next procedure.
Coating and drying c:
blending the prepared slurry into the thin consistency of the slurry according to the requirement; placing the coil qualified for inspection in an electron microscope, and adjusting the focal length; filling a core: dipping the prepared sizing agent on a small glass rod, carefully approaching a platinum wire coil, automatically filling the sizing agent into the platinum wire coil, controlling the amount of the sizing agent, just filling a core, and just wrapping a diameter outer ring; and (4) drying the coated coils in a drying box one by one, and determining the drying time according to the ambient humidity of the day.
And (d) sintering:
and (3) inserting the dried element on a sintering machine, adjusting the current to 100mA and 2 minutes respectively, adjusting the current to 140mA and 2 minutes, adjusting the current to 200mA and 2 minutes, adjusting the current to 220mA and 2 minutes, adjusting the current to 250mA and 2 minutes, closing the current, taking the element off, and transferring to the next procedure.
And (e) transfer welding:
and (3) taking one end of a qualified platinum wire off a carrier by using flat-nose tweezers, taking a support, placing one end of the platinum wire on the carrier at two thirds of the upper end of the support, stepping down a pedal plate of a spot welding machine to weld the platinum wire on a lead wire when the element is positioned between two lead wires of the support, placing the other end of the platinum wire on the support, stepping down the pedal plate of the spot welding machine to weld the platinum wire on the lead wire when the platinum wire is positioned on a straight line, inserting the platinum wire on foam after welding, and turning to the next procedure.
Pairing f:
turning on a power supply of the voltage testing machine and the constant temperature machine to heat the temperature of the constant temperature machine to 40 +/-2 ℃; ensuring good contact on a plate of an element socket voltage tester; adjusting the current to be 1.800mA, stabilizing for 5 minutes, starting to record the voltage value of each element, and filling the voltage value on a record sheet; taking down the elements from the board in sequence from 1 to 20, and inserting the elements into the voltage range on the foam according to the voltage values, wherein the voltage range is 5 millivolts; and f2, f3 and f4 are repeated, the element is measured, and the next procedure is carried out.
Stability aging test g:
turning on a power supply of the stability box, and adjusting the voltage to about 2.6V when the voltage is in no-load; inserting the matched elements on the board according to pairs to ensure good contact; after 10 pairs of elements are fully inserted, the power supply is finely adjusted to 2.5V; opening a pure methane bottle switch, adjusting the flow to 10-30mL, adjusting the flow of an oxygenation pump to 1L, and starting aeration and aging; ventilating every day, shutting off the next work, electrifying and aging; after the continuous ventilation and the electrification aging are carried out for 15 days in the mode, the measurement is started, and the power supply of the test box is turned on; the glass cover is taken off, and the element is stabilized in natural air for 30 minutes; inserting a test head into a socket on the aging rack, starting to test zero output millivolt, 0-10 grades of a wave band switch and 1-10 pairs of elements, recording the elements on a sheet, covering a test cover after the zero test, opening a steel cylinder switch of 1% CH4 standard gas, and ensuring that the flow is as follows: 1L/min, ventilating for 2 minutes, starting to record an output value, recording the output value on a sheet, subtracting the zero output millivolt from the output value to calculate the error sensitivity, and recording the error sensitivity on the sheet; after the test is finished, closing a steel bottle switch of 1% CH4 standard gas, covering a glass cover, opening a pure methane bottle switch, adjusting the flow to 10-30mL, adjusting the flow of an oxygen increasing pump to 1L, and starting ventilation and aging; after continuous testing for 3-4 days, the element with zero point and sensitivity within 1mV is taken as a qualified element, the element is taken down and inserted on the foam, the parameters of the element are written, and the next procedure is carried out.
Performance test h:
turning on a power supply of the performance tester, and adjusting a test voltage; the components are inserted on the test board, after going forward: 1-10 pairs; stabilizing the element in natural air for 20 minutes, testing zero point for 0-10 pairs, and recording on a sheet; covering a test cover, opening a 1% CH4 standard gas bottle switch, adjusting the flow to be 1L/min, recording an output value and recording the output value on a sheet for 2 minutes, closing the 1% CH4 standard gas bottle switch immediately after recording, and subtracting a zero value from the output value to calculate the sensitivity; opening a 3% CH4 standard gas bottle switch, adjusting the flow to be 1L/min for 2 minutes, recording an output value and recording the output value on a sheet, immediately closing the 3% CH4 standard gas bottle switch after recording, subtracting a zero value from the output value to calculate a standard value, and dividing the standard value by the sensitivity to calculate an actual error value; and inserting qualified elements on the foam, packaging the elements in self-sealing bags and putting the elements in storage, and scrapping unqualified elements.
Compared with the prior art, the invention has the beneficial effects that:
the processing method disclosed by the invention adopts a brand-new high-activity low-temperature reaction catalyst of the transition metal alloy as a new black element to replace the traditional gas combustion catalyst, and the nano-scale transition metal alloy reduces the temperature of the reaction of methane and oxygen in the gas. The novel alloy catalyst is mainly characterized in that:
1. the activity of the gas catalytic reaction is extremely high,
2. the critical reaction temperature is low, and the reaction temperature is high,
3. has good catalytic selectivity, is beneficial to improving the sensitivity and the accuracy of a catalytic element,
4. the reaction can be carried out at a lower temperature, the catalyst has stable performance,
5. the carrier has sensitivity, and the service life of the catalyst is greatly prolonged.
The novel catalytic element processed by the method has the advantages of strong gas interference resistance, high reaction speed, high sensitivity, good stability, low power consumption, long service life and the like, and has the characteristics of super-strong hydrogen sulfide resistance, organic silicon resistance and the like.
Drawings
FIG. 1 is a schematic diagram of a process flow framework of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention can be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope defined by the present application.
With reference to the attached figure 1, a novel catalytic element processing method comprises the following steps: the method comprises the steps of coil winding a, inspection b, slurry coating and drying c, sintering d, transfer welding e, pairing f, stability aging test g and performance test h.
Winding a of the coil:
a 1: turning on a power supply of a winding machine and a power supply for annealing, selecting a high-purity platinum wire, adjusting the number of turns according to element parameters, and mounting platinum wires at intervals; clamping the platinum wire end by using a flat-nose tweezers, and winding the platinum wire end on a metal sheet wound around the wall;
a 2: pressing a working key, automatically rotating 180 degrees around the wall, pressing down the annealing wall, lightly placing on the platinum wire for 2 seconds to enable the platinum wire to emit dark red, and putting down a crochet hook;
a 3: pressing a working key, and automatically going to the next step around the wall; the position of the crochet needle needs to be adjusted for the first time, so that the platinum wire can just pass through the crochet needle;
a 4: pressing a working key, automatically starting to wind a coil around the wall, simultaneously polishing the lead of the carrier on metallographic abrasive paper for several times to remove dirt, and placing the carrier on the carrier;
a 5: after the process is finished, pushing the transverse moving block to the position where the lead wire of the carrier and the platinum wire are horizontal, picking up the handheld spot welding gun, slightly pressing the head on the platinum wire, and simultaneously pressing a welding key to weld the platinum wire on the lead wire of the carrier;
a 6: opening a vibration switch, slightly moving the traverse block, slowly withdrawing the coil out of the mandrel, closing the vibration switch, clamping the platinum wire end by using a flat-nose forceps, and winding the platinum wire end on the metal sheet of the winding wall for 2 circles to start winding a second coil;
a 7: repeating a2, a3, a4, a5 and a6, and placing the wound coils in a circumference rotating disc; automatically winding a coil with a fixed program;
and b, checking:
b 1: and (3) placing the wound coils under an electron microscope to check one by one, wherein the following requirements are that: the coil length is 14 grids +/-1 grid, and the wire clamping length is as follows: 12.5-13 lattices;
b 2: transferring the qualified coils to the next procedure;
coating and drying c:
c 1: blending the prepared slurry with the thin consistency of the slurry according to requirements;
c 2: placing the coil qualified for inspection in an electron microscope, and adjusting the focal length;
c 3: filling a core: dipping the prepared sizing agent on a small glass rod, carefully approaching a platinum wire coil, automatically filling the sizing agent into the platinum wire coil, controlling the amount of the sizing agent, just filling a core, and just wrapping a diameter outer ring;
c 4: the coated coils are placed in a drying box one by one for drying, and the drying time is determined according to the environmental humidity of the same day;
and d, sintering:
d 1: inserting the dried element on a sintering machine, adjusting the current to 100mA and 2 minutes respectively, adjusting the current to 140mA and 2 minutes, adjusting the current to 200mA and 2 minutes, adjusting the current to 220mA and 2 minutes, adjusting the current to 250mA and 2 minutes, closing the current, taking the element down, and transferring to the next procedure;
e, transfer welding:
e 1: taking one end of a qualified platinum wire down from a carrier by using flat-nose tweezers, taking a support, placing one end of the platinum wire on the carrier at two thirds of the upper end of the support, treading down a pedal plate of a spot welding machine to weld the platinum wire on a lead wire when the component is positioned between two lead wires of the support, placing the other end of the platinum wire on the support, treading down the pedal plate of the spot welding machine to weld the platinum wire on the lead wire when the platinum wire is positioned on a straight line, inserting the platinum wire on foam after welding, and turning to the next process;
pairing f:
f 1: turning on a power supply of the voltage testing machine and the constant temperature machine to heat the temperature of the constant temperature machine to 40 +/-2 ℃;
f 2: ensuring good contact on a plate of an element socket voltage tester;
f 3: adjusting the current to be 1.800mA, stabilizing for 5 minutes, starting to record the voltage value of each element, and filling the voltage value on a record sheet;
f 4: taking down the elements from the plate according to the sequence 1-20, and inserting the elements into the voltage range on the foam according to the voltage value, wherein the voltage range is 5 millivolts;
f 5: f2, f3 and f4 are repeated, the element is measured, and the next procedure is carried out;
stability aging test g:
g 1: turning on a power supply of the stability box, and adjusting the voltage to about 2.6V when the voltage is in no-load;
g 2: inserting the matched elements on the board according to the number of pairs to ensure good contact;
g 3: after 10 pairs of elements are fully inserted, the power supply is finely adjusted to 2.5V;
g 4: opening a pure methane bottle switch, adjusting the flow to 10-30mL, adjusting the flow of an oxygenation pump to 1L, and starting aeration and aging;
g 5: ventilating every day, shutting off qi for next work, electrifying and aging;
g 6: after the continuous ventilation and the electrification aging are carried out for 15 days in the mode, the measurement is started, and the power supply of the test box is turned on;
g 7: the glass cover is taken off, and the element is stabilized in natural air for 30 minutes;
g 8: inserting a testing head into a socket on an aging rack, starting to test zero output millivolt, 0-10 grades of a band switch and 1-10 pairs of elements, recording the elements on a sheet, covering a testing cover after the zero test, opening a steel cylinder switch of 1% CH4 standard gas, and ensuring that the flow is as follows: 1L/min, ventilating for 2 minutes, starting to record an output value, recording the output value on the sheet, subtracting a zero output millivolt number from the output value to calculate the error sensitivity, and recording the error sensitivity on the sheet;
g 9: after the test is finished, closing a steel bottle switch of 1% CH4 standard gas, covering a glass cover, opening a pure methane bottle switch, adjusting the flow to 10-30mL, adjusting the flow of an oxygen increasing pump to 1L, and starting ventilation and aging;
g 10: after continuous testing for 3-4 days, taking an element with zero point and sensitivity changing within 1mV as a qualified element, taking down the qualified element, inserting the qualified element into the foam, writing parameters of the element, and transferring to the next procedure;
performance test h:
h 1: turning on a power supply of the performance tester, and adjusting the test voltage;
h 2: the components are inserted on the test board, after going forward: 1-10 pairs;
h 3: stabilizing the element in natural air for 20 minutes, testing 0-10 pairs of zero points, and recording on the sheet;
h 4: covering a test cover, opening a 1% CH4 standard gas bottle switch, adjusting the flow to be 1L/min, recording an output value and recording the output value on a sheet for 2 minutes, closing the 1% CH4 standard gas bottle switch immediately after recording, and subtracting a zero value from the output value to calculate the sensitivity;
h 5: opening a 3% CH4 standard gas bottle switch, adjusting the flow to be 1L/min, recording an output value and recording the output value on a sheet, closing the 3% CH4 standard gas bottle switch after recording, subtracting a zero point value from the output value to calculate a standard value, and dividing the standard value by the sensitivity to calculate an actual error value;
h 6: and inserting qualified elements on the foam, packaging the elements in self-sealing bags and putting the elements in storage, and scrapping unqualified elements.
The novel catalytic element processed by the method has the advantages of strong gas interference resistance, high reaction speed, high sensitivity, good stability, low power consumption, long service life and the like, and has the characteristics of super-strong hydrogen sulfide resistance, organic silicon resistance and the like.
Claims (1)
1. A novel catalytic element processing method comprises the following steps: coil coiling a, inspection b, scribble thick liquid stoving c, sintering d, transfer welding e, pair f, stability aging testing g, performance test h, its characterized in that:
winding a of a coil:
a 1: turning on a power supply of a winding machine and a power supply for annealing, selecting a high-purity platinum wire, adjusting the number of turns according to element parameters, and installing a platinum wire at a pitch; clamping the platinum wire end by using a flat-nose tweezers, and winding the platinum wire end on a metal sheet wound around the wall;
a 2: pressing a working key, automatically rotating 180 degrees around the wall, pressing down the annealing wall, lightly placing on the platinum wire for 2 seconds to enable the platinum wire to emit dark red, and putting down a crochet hook;
a 3: pressing a working key, and automatically going to the next step around the wall; the position of the crochet needle needs to be adjusted for the first time, so that the platinum wire can just pass through the crochet needle;
a 4: pressing a working key, automatically starting to wind a coil around the wall, simultaneously polishing the lead of the carrier on metallographic abrasive paper for several times to remove dirt, and placing the carrier on the carrier;
a 5: after the process is finished, pushing the traverse block to the position where the lead wire of the carrier and the platinum wire are horizontal, lifting the handheld spot welding gun, slightly pressing the head of the handheld spot welding gun on the platinum wire, and pressing a welding key to weld the platinum wire on the lead wire of the carrier;
a 6: opening a vibration switch, slightly moving the traverse block, slowly withdrawing the coil out of the mandrel, closing the vibration switch, clamping the platinum wire end by using a flat-nose forceps, and winding the platinum wire end on the metal sheet of the winding wall for 2 circles to start winding a second coil;
a 7: repeating a2, a3, a4, a5 and a6, and placing the wound coils in a circumference rotating disc; automatically winding a coil with a fixed program;
and b, checking:
b 1: and (3) placing the wound coils under an electron microscope to check one by one, wherein the following requirements are that: the coil length is 14 grids +/-1 grid, and the wire clamping length is as follows: 12.5-13 cases;
b 2: transferring the qualified coils to the next procedure;
coating and drying c:
c 1: blending the prepared slurry into the thin consistency of the slurry according to the requirement;
c 2: placing the coil qualified for inspection in an electron microscope, and adjusting the focal length;
c 3: filling a core: dipping the prepared sizing agent on a small glass rod, carefully approaching a platinum wire coil, automatically filling the sizing agent into the platinum wire coil, controlling the amount of the sizing agent, just filling a core, and just wrapping a diameter outer ring;
c 4: the coated coils are placed in a drying box one by one for drying, and the drying time is determined according to the environmental humidity of the same day;
and (d) sintering:
d 1: inserting the dried element on a sintering machine, adjusting the current to 100mA and 2 minutes respectively, adjusting the current to 140mA and 2 minutes, adjusting the current to 200mA and 2 minutes, adjusting the current to 220mA and 2 minutes, adjusting the current to 250mA and 2 minutes, closing the current, taking the element down, and transferring to the next procedure;
and (e) transfer welding:
e 1: using flat-nose tweezers to clamp one end of a platinum wire from a carrier for a qualified element, taking a support, placing one end of the platinum wire on the carrier at two thirds of the upper end of the support, stepping down a pedal plate of a spot welding machine to weld the platinum wire on a lead wire when the element is between two lead wires of the support, placing the other end of the platinum wire on the support, stepping down the pedal plate of the spot welding machine to weld the platinum wire on the lead wire when the platinum wire is on a straight line, inserting the platinum wire on foam after welding, and turning to the next procedure;
pairing f:
f 1: turning on a power supply of the voltage testing machine and the constant temperature machine to heat the temperature of the constant temperature machine to 40 +/-2 ℃;
f 2: ensuring good contact on a plate of an element socket voltage tester;
f 3: adjusting the current to be 1.800mA, stabilizing for 5 minutes, starting to record the voltage value of each element, and filling the voltage value on a record sheet;
f 4: taking down the elements from the plate according to the sequence 1-20, and inserting the elements into the voltage range on the foam according to the voltage value, wherein the voltage range is 5 millivolts;
f 5: f2, f3 and f4 are repeated, the element is measured, and the next procedure is carried out;
stability aging test g:
g 1: turning on a power supply of the stability box, and adjusting the voltage to about 2.6V when the voltage is in no-load;
g 2: inserting the matched elements on the board according to pairs to ensure good contact;
g 3: after 10 pairs of elements are fully inserted, the power supply is finely adjusted to 2.5V;
g 4: opening a pure methane bottle switch, adjusting the flow to 10-30mL, adjusting the flow of an oxygenation pump to 1L, and starting aeration and aging;
g 5: ventilating every day, shutting off the next work, electrifying and aging;
g 6: after the continuous ventilation and the electrification aging are carried out for 15 days in the mode, the measurement is started, and the power supply of the test box is turned on;
g 7: the glass cover is taken off, and the element is stabilized in natural air for 30 minutes;
g 8: inserting a testing head into a socket on an aging rack, starting to test zero output millivolt, 0-10 grades of a band switch and 1-10 pairs of elements, recording the elements on a sheet, covering a testing cover after the zero test, opening a steel cylinder switch of 1% CH4 standard gas, and ensuring that the flow is as follows: 1L/min, ventilating for 2 minutes, starting to record an output value, recording the output value on the sheet, subtracting a zero output millivolt number from the output value to calculate the error sensitivity, and recording the error sensitivity on the sheet;
g 9: after the test is finished, closing a steel bottle switch of 1% CH4 standard gas, covering a glass cover, opening a pure methane bottle switch, adjusting the flow to 10-30mL, adjusting the flow of an oxygen increasing pump to 1L, and starting ventilation and aging;
g 10: after continuous testing for 3-4 days, taking an element with the zero point and the sensitivity changing within 1mV as a qualified element, taking down the qualified element to insert the qualified element on the foam, writing parameters of the element, and transferring to the next procedure;
and (5) performance test h:
h 1: turning on a power supply of the performance tester, and adjusting a test voltage;
h 2: the components are inserted on the test board, after going forward: 1-10 pairs;
h 3: stabilizing the element in natural air for 20 minutes, testing 0-10 pairs of zero points, and recording on the sheet;
h 4: covering a test cover, opening a 1% CH4 standard gas bottle switch, adjusting the flow rate to be 1L/min for 2 minutes, recording an output value and recording the output value on a sheet, immediately closing the 1% CH4 standard gas bottle switch after recording, and subtracting a zero value from the output value to calculate the sensitivity;
h 5: opening a 3% CH4 standard gas bottle switch, adjusting the flow to be 1L/min, recording an output value and recording the output value on a sheet, closing the 3% CH4 standard gas bottle switch after recording, subtracting a zero point value from the output value to calculate a standard value, and dividing the standard value by the sensitivity to calculate an actual error value;
h 6: inserting qualified elements on the foam, packaging the elements in a self-sealing bag and putting the elements in storage, and scrapping unqualified elements.
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| CN116140942A (en) * | 2023-04-18 | 2023-05-23 | 南昌三盛半导体有限公司 | Method for welding nickel-platinum wire of thin film resistor chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116140942A (en) * | 2023-04-18 | 2023-05-23 | 南昌三盛半导体有限公司 | Method for welding nickel-platinum wire of thin film resistor chip |
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