CN114644891B - Preparation method and application of ethyl silicate high-temperature strain adhesive - Google Patents
Preparation method and application of ethyl silicate high-temperature strain adhesive Download PDFInfo
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- CN114644891B CN114644891B CN202210332723.6A CN202210332723A CN114644891B CN 114644891 B CN114644891 B CN 114644891B CN 202210332723 A CN202210332723 A CN 202210332723A CN 114644891 B CN114644891 B CN 114644891B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J1/00—Adhesives based on inorganic constituents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
Abstract
A preparation method and application of a high-temperature strain adhesive of ethyl silicate belong to the field of strain adhesives. Adding ethyl silicate and ethanol into a glass flask, stirring and mixing to form ethyl silicate-ethanol solution, standing at room temperature, dripping catalyst solution into the ethyl silicate-ethanol solution, dripping catalyst, stirring thoroughly to obtain partially hydrolyzed ethyl silicate hydrolysate, checking whether the hydrolysate is colorless and transparent, and measuring SiO of the hydrolysate 2 Content, viscosity, density index; transferring the prepared partially hydrolyzed ethyl silicate hydrolysate into a clean and dry glass container, sealing, storing for a period of time, adding a hardening agent, stirring until the mixture is transparent and colorless, adding a filler, stirring uniformly, and sealing to obtain the ethyl silicate high-temperature strain gel. The high-temperature strain adhesive of the invention has high tolerance temperature, small brittleness, environmental protection, no toxicity, no peculiar smell and high bonding strength, and can firmly adhere the strain gage to resist the high temperature below 1000 ℃.
Description
Technical Field
The invention belongs to the field of strain adhesives, and particularly relates to a high-temperature strain adhesive of ethyl silicate type, which can firmly adhere strain gauges and resist the high temperature below 1000 ℃, and a preparation method and an application method thereof.
Background
The strain adhesive has special mechanical properties, can firmly adhere the strain gauge, and can accurately transfer strain. In recent years, with the development of high-temperature test requirements of strain gauges, the high-temperature resistance of strain gauges also presents a great challenge. The high temperature resistant strain adhesive commonly used at present mainly comprises organic silicon resin strain adhesive and phosphate strain adhesive. Although the organic silicon resin strain adhesive has high bonding strength and good toughness, the highest use temperature is 400 ℃ generally, and the strain test at a higher temperature cannot be satisfied. For example, chinese patent No. CN108148539A discloses a medium-temperature cured high-temperature resistant wave-transparent adhesive which is prepared from epoxy modified organic silicon resin, mica powder and the like serving as raw materials and can resist the high temperature of 450 ℃. Phosphate-based strain adhesives, although resistant to relatively high temperatures, suffer from the problems of high brittleness and insufficient adhesive strength (chemical and adhesive, 2017,39 (01): 18).
Disclosure of Invention
The invention provides a high-temperature strain adhesive of ethyl silicate, a preparation method and application thereof.
A preparation method of a high-temperature strain adhesive of ethyl silicate comprises the following raw materials in parts by weight:
ethyl silicate: 100 parts of
Ethanol: 10-15 parts
Catalyst: 8-13 parts
Hardening agent: 50-70 parts
And (3) filling: 90-110 parts.
The preparation process comprises the following steps: adding ethyl silicate and ethanol into a glass flask according to parts by weight, fully stirring to enable the ethyl silicate and the ethanol to be mixed to form an ethyl silicate-ethanol solution, and standing for 80-100min at room temperature; then the catalyst solution is added into the ethyl silicate-ethanol solution in a dropwise manner, and the catalyst solution is stirred at the rotating speed of 500-600 r/min; after the catalyst was added dropwise and stirred sufficiently, a partially hydrolyzed ethyl silicate hydrolysate was obtained, whether colorless and transparent was checked, and the SiO of the hydrolysate was measured 2 Content, viscosity, density index. Transferring the prepared partially hydrolyzed ethyl silicate hydrolysate into a clean and dry glass container, sealing, storing for 12-16 days at 20-25 ℃, adding a hardener according to parts by weight, stirring until the mixture is transparent and colorless, and sealing and storing for 5-7 days at the temperature of not lower than 22 ℃; and adding filler according to the weight parts, stirring uniformly, sealing, standing for 20-40min at the temperature of 21-23 ℃, uncovering and stirring for a plurality of times, sealing immediately, and stirring uniformly to obtain the ethyl silicate high-temperature strain adhesive.
Further, the ethyl silicate is a main raw material for preparing high-temperature strain rubber, wherein SiO 2 The content is 28-40%. The ethanol is a cosolvent, has the purity of analytical purity and is used for promoting the sufficient mutual solubility of the ethyl silicate raw material and the aqueous solution of the catalyst.
Further, the catalyst is a hydrochloric acid-boric acid mixed water solution or a sulfuric acid-boric acid mixed water solution or a nitric acid-boric acid mixed water solution, is used for stably controlling the hydrolysis speed of the ethyl silicate, and improves the bonding force and bonding strength of the prepared high-temperature strain adhesive at high temperature, so that the high-temperature strain adhesive can resist high temperature of 700-1000 ℃ and maintain good bonding strength. In the invention, hydrochloric acid-boric acid mixed aqueous solution, sulfuric acid-boric acid mixed aqueous solution or nitric acid-boric acid mixed aqueous solution is adopted as a catalyst for hydrolysis reaction of ethyl silicate, and when the catalyst is the hydrochloric acid-boric acid mixed aqueous solution, the mass ratio of hydrochloric acid (36 percent), boric acid (analytically pure) and water is 1:0.7:16. When the catalyst is a sulfuric acid-boric acid mixed aqueous solution, the mass ratio of sulfuric acid (98% by mass), boric acid (analytically pure) and water is 1:1.5:32. When the catalyst is a nitric acid-boric acid mixed aqueous solution, the mass ratio of nitric acid (68% by mass), boric acid (analytically pure) and water is 1:0.8:18. The catalyst can stably prepare the partially hydrolyzed ethyl silicate hydrolysate.
Further, the hardening agent is ethyl cellosolve, and the function is to adjust the hardness of the prepared high-temperature strain adhesive, so that the high-temperature strain adhesive can still maintain good hardness at the high temperature stage of 700-1000 ℃.
Further, the filler is mixed corundum, and is obtained by mixing corundum particles with a particle size of M7 and corundum particles with a particle size of M40 according to a mass ratio of 1:1, and the filler is used for preparing the ethyl silicate high-temperature strain adhesive by mixing the filler with the partially hydrolyzed ethyl silicate hydrolysate.
Further, the prepared partially hydrolyzed ethyl silicate hydrolysate is characterized in that: the appearance is colorless and transparent; siO (SiO) 2 The content is 23-25%; at 20 ℃, the viscosity is 2.0 to 3.0cSt, and the density is 0.92 to 0.94g/cm 3 。
The application of the ethyl silicate high-temperature strain adhesive is characterized in that the ethyl silicate high-temperature strain adhesive is used for adhering a strain gauge on a metal substrate, and comprises the following steps:
step 1: surface treatment: and (3) pretreating the surface of the metal substrate to be adhered to increase the surface roughness of the substrate, and removing impurities such as oil stains, dust and the like on the surface to obtain the surface-treated metal substrate.
Step 2: sticking a strain gauge: firstly, uniformly coating a layer of high-temperature strain adhesive on a metal substrate subjected to surface treatment as an insulating layer, and carrying out air drying and ammonia drying treatment on the metal substrate. After the ammonia gas is fully volatilized, uniformly coating a second layer of high-temperature strain adhesive, spreading the strain gauge and the leads thereof on the second layer of high-temperature strain adhesive, compacting and fixing, continuously and uniformly coating a layer of high-temperature strain adhesive on the strain gauge and the leads thereof, and carrying out air drying and ammonia drying treatment on the strain gauge and the leads thereof.
Step 3: strengthening: after the ammonia drying is finished for 30 minutes, a layer of partially hydrolyzed ethyl silicate hydrolysate added with a small amount of water is uniformly coated, and after a few minutes, the mixture is air-dried and ammonia-dried.
Step 4: and (3) high-temperature curing, namely after the ammonia gas is fully volatilized, placing the materials into a heating furnace for heating and curing, firstly heating to 75-85 ℃, preserving heat for 0.5-1.5 hours, then heating to 250-280 ℃, preserving heat for 25-35 minutes, and finally heating to 340-360 ℃ and preserving heat for 25-35 minutes. If the attached strain gauge needs to be tested or operated at a high temperature above 700 ℃, the heating temperature of the last step is increased to 700 ℃ and the temperature is kept for 13-17 minutes. And after the heat preservation is finished, opening a heating furnace to cool the material, and completing solidification to obtain the metal substrate with the strain gauge adhered.
The beneficial effects are that:
compared with the organic silicon resin strain adhesive and the phosphate strain adhesive, the ethyl silicate high-temperature strain adhesive has high temperature resistance, small brittleness and high bonding strength, can firmly adhere a strain gauge to resist the high temperature below 1000 ℃, and is suitable for adhering the strain gauge on chromium nickel, titanium alloy and other high-temperature steel substrates to carry out high-temperature vibration stress test. The ethyl silicate high-temperature strain gel also has the beneficial effects of environmental protection, no toxicity and no peculiar smell.
Detailed Description
The invention will be described in detail with reference to specific examples:
example 1
The weight portion ratio:
ethyl silicate: 100
Ethanol: 12
Catalyst: 11
Hardening agent: 60
And (3) filling: 100
The preparation method comprises the following steps:
SiO is made of 2 100 parts of ethyl silicate with a content of 28% are mixed with 12 parts of analytically pure ethanol in a glass flask and stirred thoroughly. 0.6 part of concentrated hydrochloric acid with the mass fraction of 36% and 0.4 part of boric acid with the mass fraction of 36% are mixed in 10 parts of water, and the mixture is fully stirred to prepare 11 parts of hydrochloric acid-boric acid mixed water solution catalyst. And (3) dropwise adding 11 parts of the aqueous solution of the catalyst into the mixed solution of ethyl silicate and ethanol, and carrying out stable hydrolysis on the ethyl silicate while dropwise adding and stirring at the rotating speed of 500-600 rpm to obtain the partially hydrolyzed ethyl silicate hydrolysate. 60 parts of ethyl cellosolve hardener is added into the prepared partially hydrolyzed ethyl silicate hydrolysate, the mixture is stirred to fully mix the ethyl cellosolve hardener and the ethyl cellosolve, 100 parts of mixed corundum filler is added into the mixture, the mixture is fully stirred and stored in a sealing way, and the ethyl silicate high-temperature strain adhesive is prepared.
The application method comprises the following steps:
step 1: surface treatment: using Al with a diameter of 130 μm 2 O 3 The substrate to be bonded (such as chrome-nickel, titanium alloy) is subjected to sand blowing treatment, and then the surface of the substrate is wiped by an alcohol cotton ball. Dipping the prepared ethyl silicate high-temperature strain adhesive by using an organic glass rod, and coating a layer (insulating layer) on the surface of the substrate. And naturally air-drying the insulating layer for 12-15 hours at the temperature of not lower than 22 ℃.
Step 2: sticking a strain gauge: firstly, uniformly coating a layer of high-temperature strain adhesive on a metal substrate subjected to surface treatment as an insulating layer, and carrying out air drying and ammonia drying treatment on the metal substrate. After the ammonia gas is fully volatilized, uniformly coating a second layer of high-temperature strain adhesive, spreading the strain gauge and the leads thereof on the second layer of high-temperature strain adhesive, compacting and fixing, continuously and uniformly coating a layer of high-temperature strain adhesive on the strain gauge and the leads thereof, and carrying out air drying and ammonia drying treatment on the strain gauge and the leads thereof.
Step 3: strengthening: after the ammonia drying is finished for 30 minutes, a layer of partially hydrolyzed ethyl silicate hydrolysate added with a small amount of water is uniformly coated, and after a few minutes, the mixture is air-dried and ammonia-dried.
Step 4: and (3) high-temperature curing, namely placing the materials into a heating furnace for heating and curing after the ammonia gas is fully volatilized, firstly heating to 80 ℃, preserving heat for 1 hour, then heating to 250-280 ℃, preserving heat for 30 minutes, and finally heating to 350 ℃ and preserving heat for 30 minutes. If the attached strain gauge needs to be tested at a high temperature of 700-1000 ℃, the heating temperature of the last step is increased to 700 ℃ and the temperature is kept for 15 minutes. And after the heat preservation is finished, opening a heating furnace to cool the material, and completing solidification to obtain the metal substrate with the strain gauge adhered.
Example 2
The weight portion ratio:
ethyl silicate: 100
Ethanol: 12
Catalyst: 10
Hardening agent: 60
And (3) filling: 100
The preparation method comprises the following steps:
SiO is made of 2 100 parts of ethyl silicate with a content of 28% are mixed with 12 parts of analytically pure ethanol in a glass flask and stirred thoroughly. 0.4 part of concentrated sulfuric acid with the mass fraction of 98% and 0.6 part of boric acid with the mass fraction of analytical purity are mixed in 9 parts of water, and the mixture is fully stirred to prepare 10 parts of sulfuric acid-boric acid mixed aqueous solution catalyst. And (3) dropwise adding the 10 parts of the aqueous solution of the catalyst into the mixed solution of ethyl silicate and ethanol, and carrying out stable hydrolysis on the ethyl silicate while dropwise adding and stirring at the rotating speed of 500-600 rpm to obtain the partially hydrolyzed ethyl silicate hydrolysate. 60 parts of ethyl cellosolve hardener is added into the prepared partially hydrolyzed ethyl silicate hydrolysate, the mixture is stirred to fully mix the ethyl cellosolve hardener and the ethyl cellosolve, 100 parts of mixed corundum filler is added into the mixture, the mixture is fully stirred and stored in a sealing way, and the ethyl silicate high-temperature strain adhesive is prepared.
The application method of the ethyl silicate high-temperature strain gel in the embodiment is the same as that in the embodiment 1.
Example 3
The weight portion ratio:
ethyl silicate: 100
Ethanol: 12
Catalyst: 11
Hardening agent: 60
And (3) filling: 100
The preparation method comprises the following steps:
SiO is made of 2 100 parts of ethyl silicate with a content of 28% are mixed with 12 parts of analytically pure ethanol in a glass flask and stirred thoroughly. 0.6 part of nitric acid with the mass fraction of 68% and 0.4 part of boric acid with the mass fraction of 68% are mixed in 10 parts of water, and the mixture is fully stirred to prepare 11 parts of nitric acid-boric acid mixed water solution catalyst. And (3) dropwise adding 11 parts of the aqueous solution of the catalyst into the mixed solution of ethyl silicate and ethanol, and carrying out stable hydrolysis on the ethyl silicate while dropwise adding and stirring at the rotating speed of 500-600 rpm to obtain the partially hydrolyzed ethyl silicate hydrolysate. 60 parts of ethyl cellosolve hardener is added into the prepared partially hydrolyzed ethyl silicate hydrolysate, the mixture is stirred to fully mix the ethyl cellosolve hardener and the ethyl cellosolve, 100 parts of mixed corundum filler is added into the mixture, the mixture is fully stirred and stored in a sealing way, and the ethyl silicate high-temperature strain adhesive is prepared.
The application method of the ethyl silicate high-temperature strain gel in the embodiment is the same as that in the embodiment 1.
Claims (2)
1. A preparation method of a high-temperature strain adhesive of ethyl silicate is characterized by comprising the following raw materials in parts by weight:
ethyl silicate: 100 parts of
Ethanol: 10-15 parts
Catalyst: 8-13 parts
Hardening agent: 50-70 parts
And (3) filling: 90-110 parts;
the catalyst is hydrochloric acid-boric acid mixed water solution, sulfuric acid-boric acid mixed water solution or nitric acid-boric acid mixed water solution; when the catalyst is a hydrochloric acid-boric acid mixed water solution, the mass ratio of hydrochloric acid to boric acid to water is 1:0.7:16; when the catalyst is sulfuric acid-boric acid mixed water solution, the mass ratio of sulfuric acid to boric acid to water is 1:1.5:32; when the catalyst is a nitric acid-boric acid mixed water solution, the mass ratio of nitric acid to boric acid to water is 1:0.8:18;
the filler is just mixedJade Al 2 O 3 The corundum particles with the particle size of M7 and the corundum particles with the particle size of M40 are mixed according to the mass ratio of 1:1;
the hardening agent is ethyl cellosolve;
the preparation process comprises the following steps: adding ethyl silicate and ethanol into a glass flask according to parts by weight, fully stirring to enable the ethyl silicate and the ethanol to be mixed to form an ethyl silicate-ethanol solution, and standing for 80-100min at room temperature; then the catalyst solution is added into the ethyl silicate-ethanol solution in a dropwise manner, and the catalyst solution is stirred at the rotating speed of 500-600 r/min; after the catalyst was added dropwise and stirred sufficiently, a partially hydrolyzed ethyl silicate hydrolysate was obtained, whether colorless and transparent was checked, and the SiO of the hydrolysate was measured 2 Content, viscosity, density index; transferring the prepared partially hydrolyzed ethyl silicate hydrolysate into a clean and dry glass container, sealing, storing for 12-16 days at 20-25 ℃, adding a hardener according to parts by weight, stirring until the mixture is transparent and colorless, and sealing and storing for 5-7 days at the temperature of not lower than 22 ℃; adding filler according to parts by weight, stirring uniformly, sealing, standing at 21-23 ℃ for 20-40min, uncovering and stirring for several times, sealing immediately, and stirring uniformly to obtain the ethyl silicate high-temperature strain adhesive;
SiO in the ethyl silicate 2 The content is 28% -40%; the ethanol is a cosolvent and has the purity of analytical purity;
the partially hydrolyzed ethyl silicate hydrolysate obtained by the catalytic hydrolysis of the ethyl silicate is colorless and transparent in appearance; siO (SiO) 2 The content is 23-25%; at 20 ℃, the viscosity is 2.0 to 3.0cSt, and the density is 0.92 to 0.94g/cm 3 。
2. The application of the high-temperature strain rubber of ethyl silicate prepared by the method as claimed in claim 1, wherein the high-temperature strain rubber of ethyl silicate is used for pasting strain gauges on metal substrates, and comprises the following steps:
step 1: surface treatment: pretreating the surface of a metal substrate to be adhered to increase the surface roughness of the substrate, and removing greasy dirt and dust impurities on the surface to obtain a surface-treated metal substrate;
step 2: sticking a strain gauge: firstly, uniformly coating a layer of high-temperature strain adhesive on a metal substrate subjected to surface treatment as an insulating layer, and carrying out air drying and ammonia drying treatment on the insulating layer; after the ammonia gas is fully volatilized, uniformly coating a second layer of high-temperature strain adhesive, spreading the strain gauge and leads thereof on the second layer of high-temperature strain adhesive, compacting and fixing, continuously and uniformly coating a layer of high-temperature strain adhesive on the strain gauge and leads thereof, and carrying out air drying and ammonia drying treatment on the strain gauge and leads thereof;
step 3: strengthening: after the ammonia drying is finished for 30 minutes, uniformly coating a layer of partially hydrolyzed ethyl silicate hydrolysate with a small amount of water, and after a few minutes, air-drying and ammonia drying the partially hydrolyzed ethyl silicate hydrolysate;
step 4: high temperature curing, namely after the ammonia gas is fully volatilized, putting the materials into a heating furnace for heating and curing, firstly heating to 75-85 ℃, preserving heat for 0.5-1.5 hours, then heating to 250-280 ℃, preserving heat for 25-35 minutes, and finally heating to 340-360 ℃ and preserving heat for 25-35 minutes; if the adhered strain gauge needs to be tested or operated at a high temperature above 700 ℃, the heating temperature of the last step is increased to 700 ℃ and the temperature is kept for 13-17 minutes; and after the heat preservation is finished, opening a heating furnace to cool the material, and completing solidification to obtain the metal substrate with the strain gauge adhered.
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| CN202210332723.6A CN114644891B (en) | 2022-03-31 | 2022-03-31 | Preparation method and application of ethyl silicate high-temperature strain adhesive |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB925384A (en) * | 1960-12-15 | 1963-05-08 | Secr Aviation | Process of protecting molybdenum and molybdenum alloys |
| GB1292938A (en) * | 1970-09-25 | 1972-10-18 | Anderson Dev Co | Improvements in or relating to compositions containing hydrocarbonether polysilicates |
| CN85100057A (en) * | 1985-04-01 | 1986-07-23 | 清华大学 | High-temperature strain sustainable adhesive |
| CN104174814A (en) * | 2014-09-16 | 2014-12-03 | 沈阳飞机工业（集团）有限公司 | Ethyl silicate hydrolysate and preparation method and application thereof |
| CN109059747A (en) * | 2018-07-04 | 2018-12-21 | 北京科技大学 | A kind of temporary frame work wire grid formula high temperature strain gauge and its manufacture and use method |
| CN113008490A (en) * | 2021-02-02 | 2021-06-22 | 清华大学 | Leakage self-detection rubber sealing element, preparation method and leakage detection method |
-
2022
- 2022-03-31 CN CN202210332723.6A patent/CN114644891B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB925384A (en) * | 1960-12-15 | 1963-05-08 | Secr Aviation | Process of protecting molybdenum and molybdenum alloys |
| GB1292938A (en) * | 1970-09-25 | 1972-10-18 | Anderson Dev Co | Improvements in or relating to compositions containing hydrocarbonether polysilicates |
| CN85100057A (en) * | 1985-04-01 | 1986-07-23 | 清华大学 | High-temperature strain sustainable adhesive |
| CN104174814A (en) * | 2014-09-16 | 2014-12-03 | 沈阳飞机工业（集团）有限公司 | Ethyl silicate hydrolysate and preparation method and application thereof |
| CN109059747A (en) * | 2018-07-04 | 2018-12-21 | 北京科技大学 | A kind of temporary frame work wire grid formula high temperature strain gauge and its manufacture and use method |
| CN113008490A (en) * | 2021-02-02 | 2021-06-22 | 清华大学 | Leakage self-detection rubber sealing element, preparation method and leakage detection method |
Non-Patent Citations (1)
| Title |
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| 尹福炎 等.《高温/低温电阻应变片及其应用》.国防工业出版社,2014,(第1版),第39-51页. * |
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