CN101592530A - The thermocouple protective casing of liquid zinc corrosion resistant - Google Patents
The thermocouple protective casing of liquid zinc corrosion resistant Download PDFInfo
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- CN101592530A CN101592530A CNA2009100653134A CN200910065313A CN101592530A CN 101592530 A CN101592530 A CN 101592530A CN A2009100653134 A CNA2009100653134 A CN A2009100653134A CN 200910065313 A CN200910065313 A CN 200910065313A CN 101592530 A CN101592530 A CN 101592530A
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Abstract
The present invention discloses a kind of thermocouple protective casing of liquid zinc corrosion resistant, and by weight percentage, composition is iron powder 50～60%, molybdenum powder 20～30%, tungsten powder 10～20%, chromium powder 5～10%, boron powder 3～6% and cementing agent 1～3%; After metal powder and cementing agent mixed, the mould extrusion forming of packing into, sintering 6～8h under 1430～1450 ℃ of high temperature makes thermocouple protective casing then.Product of the present invention adopts PM technique to make through pressurization, sintering, and method for making is simple, does not need subsequent treatment processing.Infiltration does not take place and soaks into diffusion with protective casing of the present invention in zinc liquid during use, and this protective casing is high temperature resistant, can anti-high temperature more than 1300 ℃, under the condition of 460～650 ℃ of normal zinc liquid temperatures, use, can reach 4～5 years its serviceable life, prolonged the serviceable life of thermopair greatly; Environmental pollution is little in the production run, invests lessly, and production cost is low, is easy to go into operation.
Description
One, technical field:
The present invention relates to a kind of thermocouple protective casing, particularly relate to a kind of thermocouple protective casing of liquid zinc corrosion resistant.
Two, background technology:
On steel wire, steelwork galvanization production line, the zinc pot is used for the heating and the insulation of galvanizing zinc.Adopting thermopair continuous temperature measurement and temperature control method, is one of key factor that guarantees galvanizing product quality, the reduction energy and material consumption.Being used for measuring the motlten metal zinc liquid of high temperature, mainly is to adopt thermopair, and thermocouple protective casing commonly used adopts the stainless-steel pipe material, and an end is made through shutoff welding and machine work.Thermopair is immersed in 460～480 ℃ the high temperature zinc liquid for a long time; zinc liquid is with after stainless steel contacts; because the strong corrosion effect of zinc liquid; by reactions such as the infiltration between crystal, diffusion and dissolvings; form new metallic compound; generally will be fallen by the metallic zinc corrosion, cause shorten greatly the serviceable life of thermopair through 7～10 days stainless steel protection sleeve pipes.So not only cause the consumption of thermopair big, and in the thermopair damage process, be easy to cause temperature, cause measuring error for steel wire, steelwork galvanizing, directly have influence on the stable of production technology than great fluctuation process.
Nonmetal thermocouple protective casing commonly used is as Al
2O
3Material, its thermal shock resistance is relatively poor, the damage of easily breaking, graphite material sleeve pipes etc. are then because its physical strength is lower, in manually fishing for the cadmia operation process, cause impact failure easily, need often to change, can not satisfy the long-time requirement of using in zinc liquid.
The patent No. is that 200510029204.9 file discloses a kind of thermo-couple composite protective sleeve; comprise parent tube cylindrical shell and coating; the end of parent tube cylindrical shell is processed to arc-shaped curved surface; the parent tube cylindrical shell is made of metal; coating is made up of in conjunction with bottom, intermediate layer and work layer on surface metal; metal is cermet material or the alloy material close with parent tube cylindrical shell metallicity in conjunction with bottom; work layer on surface is an oxide ceramic material, and intermediate layer is cermet material and oxide ceramic material potpourri.Though this thermo-couple composite protective sleeve has certain decay resistance, method for making complexity, result of use are also not ideal.
Three, summary of the invention:
The technical problem to be solved in the present invention: overcome the problem in the background technology, the thermocouple protective casing of a kind of long service life, the simple liquid zinc corrosion resistant of method for making is provided.
Technical scheme of the present invention:
A kind of thermocouple protective casing of liquid zinc corrosion resistant, material composition contain iron powder 50～60%, molybdenum powder 20～30%, tungsten powder 10～20%, chromium powder 5～10%, boron powder 3～6% and cementing agent 1～3% by weight percentage; After metal powder and cementing agent mixed, the mould extrusion forming of packing into, sintering 6～8h under 1430～1450 ℃ of high temperature makes described thermocouple protective casing then.
Described protective casing material composition is iron powder 50～52%, molybdenum powder 22～25%, tungsten powder 15～17%, chromium powder 5～6.5%, boron powder 3～4.5%, cementing agent 1～1.5%.
Described protective casing material composition is iron powder 54～57%, molybdenum powder 20～24%, tungsten powder 10～15%, chromium powder 6～9%, boron powder 3～5%, cementing agent 1～2%.
Described cementing agent is the potpourri of sodium silicate aqueous solution and ten phosphate dihydrate trisodiums, and wherein sodium silicate accounts for 88～94% of mixture weight; The density of described sodium silicate aqueous solution is 1.3～1.5g/cm
3The granularity of described iron powder, molybdenum powder, tungsten powder, chromium powder and boron powder is 200～300 orders; The thickness of described thermocouple protective casing is 2～3mm; Pressure during described extrusion forming is 250～300MPa.
Positive beneficial effect of the present invention:
(1) thermocouple protective casing of liquid zinc corrosion resistant of the present invention adopts PM technique to make through pressurization, sintering, and method for making is simple, does not need subsequent treatment processing.Infiltration does not take place and soaks into diffusion with protective casing of the present invention in zinc liquid during use; and this protective casing is high temperature resistant; can anti-high temperature more than 1300 ℃; under the condition of 460～650 ℃ of normal zinc liquid temperatures, use; can reach 4～5 years its serviceable life; compare with existing stainless-steel pipe thermocouple protective casing, product of the present invention has prolonged the serviceable life of thermopair greatly.
(2) product of the present invention adopts PM technique in process of production, and material loss is than adopting general casting method loss to lack, and environmental pollution is little in the production run, invest lessly, and production cost is low, is easy to operation.Therefore, the present invention has good popularization value and economic benefit.
Four, embodiment:
Below in conjunction with embodiment the present invention is further described.
Embodiment one: the thermocouple protective casing of liquid zinc corrosion resistant; the composition of this protective casing material by weight percentage; see Table the corresponding data in; wherein the granularity of metal powder is 200～300 orders; cementing agent is the potpourri of sodium silicate aqueous solution and ten phosphate dihydrate trisodiums; wherein sodium silicate aqueous solution accounts for 90% of mixture weight, and the density of sodium silicate aqueous solution is 1.3～1.5g/cm
3
During preparation, after above-mentioned powder and cementing agent mixed, the mould of packing into was to be pressed into cylinder-shaped sleeve under the condition of 260MPa at pressure, by 1430 ℃ high temperature sintering 8h, makes thermocouple protective casing of the present invention again.This thermocouple protective casing one end sealing, sleeve pipe size and thermopair size are complementary, and shape is like test tube, and its thickness is generally 2～3mm.
Embodiment two, no longer repeat with embodiment one something in common, difference is:
The composition of protective casing material sees Table the corresponding data in, and wherein the granularity of metal powder is 200～250 orders, and cementing agent is the potpourri of sodium silicate aqueous solution and ten phosphate dihydrate trisodiums, and wherein sodium silicate aqueous solution accounts for 92% of mixture weight; The density of described sodium silicate solution is 1.4g/cm
3
During preparation, after above-mentioned powder and cementing agent mixed, the mould of packing into was to be pressed into cylinder-shaped sleeve under the condition of 300MPa at pressure, by 1450 ℃ high temperature sintering 6h, makes thermocouple protective casing of the present invention again.
Embodiment three, no longer repeat with embodiment one something in common, difference is:
The composition of protective casing material sees Table the corresponding data in; wherein the granularity of metal powder is 250～300 orders; cementing agent is the potpourri of sodium silicate aqueous solution and ten phosphate dihydrate trisodiums, and wherein sodium silicate aqueous solution accounts for 88% of mixture weight, and the density of sodium silicate solution is 1.5g/cm
3
During preparation, after above-mentioned powder and cementing agent mixed, the mould of packing into was to be pressed into cylinder-shaped sleeve under the condition of 280MPa at pressure, by 1430 ℃ high temperature sintering 8h, makes thermocouple protective casing of the present invention again.
Embodiment four, no longer repeat with embodiment one something in common, difference is:
The composition of protective casing material sees Table the corresponding data in,
During preparation, after above-mentioned powder and cementing agent mixed, the mould of packing into was to be pressed into cylinder-shaped sleeve under the condition of 280MPa at pressure, by 1440 ℃ high temperature sintering 7h, makes thermocouple protective casing of the present invention again.
The composition of embodiment five～30, protective casing material sees Table the corresponding data in, and the preparation method no longer describes in detail with any method among the embodiment one～four herein.
Table 1: the thermocouple protective casing composition proportion (by weight percentage, %) among each embodiment
Continuous table 1:
Claims (6)
1, a kind of thermocouple protective casing of liquid zinc corrosion resistant, it is characterized in that: this protective casing material composition contains iron powder 50～60%, molybdenum powder 20～30%, tungsten powder 10～20%, chromium powder 5～10%, boron powder 3～6% and cementing agent 1～3% by weight percentage; After metal powder and cementing agent mixed, the mould extrusion forming of packing into, sintering 6～8h under 1430～1450 ℃ of high temperature makes described thermocouple protective casing then.
2, the thermocouple protective casing of liquid zinc corrosion resistant according to claim 1; it is characterized in that: described protective casing material composition is iron powder 50～52%, molybdenum powder 22～25%, tungsten powder 15～17%, chromium powder 5～6.5%, boron powder 3～4.5%, cementing agent 1～1.5%.
3, the thermocouple protective casing of liquid zinc corrosion resistant according to claim 1; it is characterized in that: described protective casing material composition is iron powder 54～57%, molybdenum powder 20～24%, tungsten powder 10～15%, chromium powder 6～9%, boron powder 3～5%, cementing agent 1～2%.
4, the thermocouple protective casing of liquid zinc corrosion resistant according to claim 1 is characterized in that: described cementing agent is the potpourri of sodium silicate aqueous solution and ten phosphate dihydrate trisodiums, and wherein sodium silicate accounts for 88～94% of mixture weight; The density of described sodium silicate aqueous solution is 1.3～1.5g/cm
3The granularity of described iron powder, molybdenum powder, tungsten powder, chromium powder and boron powder is 200～300 orders.
5, the thermocouple protective casing of liquid zinc corrosion resistant according to claim 1 is characterized in that: the thickness of described thermocouple protective casing is 2～3mm.
6, the thermocouple protective casing of liquid zinc corrosion resistant according to claim 1 is characterized in that: the pressure during described extrusion forming is 250～300MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100653134A CN101592530B (en) | 2009-06-30 | 2009-06-30 | Liquid zinc corrosion resistant thermocouple protective casing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100653134A CN101592530B (en) | 2009-06-30 | 2009-06-30 | Liquid zinc corrosion resistant thermocouple protective casing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928108A (en) * | 2012-11-22 | 2013-02-13 | 阿尔赛(苏州)无机材料有限公司 | Novel pyrometer couple |
| CN103926013A (en) * | 2013-01-15 | 2014-07-16 | 宝山钢铁股份有限公司 | Protective sleeve of high-temperature thermocouple for sintering |
| CN107530779A (en) * | 2016-04-12 | 2018-01-02 | （株）韩亚科技 | The manufacture method of closed molded cannula |
-
2009
- 2009-06-30 CN CN2009100653134A patent/CN101592530B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928108A (en) * | 2012-11-22 | 2013-02-13 | 阿尔赛(苏州)无机材料有限公司 | Novel pyrometer couple |
| CN103926013A (en) * | 2013-01-15 | 2014-07-16 | 宝山钢铁股份有限公司 | Protective sleeve of high-temperature thermocouple for sintering |
| CN107530779A (en) * | 2016-04-12 | 2018-01-02 | （株）韩亚科技 | The manufacture method of closed molded cannula |
| CN107530779B (en) * | 2016-04-12 | 2019-03-05 | （株）韩亚科技 | The manufacturing method of closed molded cannula |
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| CN101592530B (en) | 2010-11-03 |
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