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A dual-mode temperature-sensing glass-ceramic and its preparation method and application

A glass-ceramic and dual-mode technology, which is applied in the field of temperature sensing, can solve the problems of measurement error and the difficulty of miniaturization of thermistors, and achieve the effect of high accuracy and simple preparation method

Active Publication Date: 2020-10-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many extreme conditions such as corrosive environments and living organisms, this method of measuring thermal contact has considerable limitations.
In addition, traditional liquid thermometers, thermocouples, pyrometers, and thermistors are not easy to miniaturize. When the size of the measured object is small, there will be great errors in the measurement results.

Method used

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  • A dual-mode temperature-sensing glass-ceramic and its preparation method and application
  • A dual-mode temperature-sensing glass-ceramic and its preparation method and application
  • A dual-mode temperature-sensing glass-ceramic and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of precursor glass: the molar composition is: SiO 2 :45%, Al 2 o 3 :22%, Na 2 O: 16%, NaF: 9%, YF 3 :8%, YbF 3 :1%, ErF 3 :0.5%, Cr 2 o 3 : 0.5%, weigh 100g raw material, grind it in an agate mortar for 30min, make it fully mix. Pour the uniformly mixed material into a 200ml corundum crucible, and then put the corundum crucible into a high-temperature furnace. Firstly, the temperature was raised to 1000°C at a rate of 8°C / min, and then to 1550°C at a rate of 5°C / min, and then kept for 1 hour. Then the molten glass is quickly poured into a preheated mold at 250°C, placed in a muffle furnace heated to 500°C for 3 hours, and then cooled to below 50°C at a rate of 10°C / h to obtain a precursor glass .

[0036] (2) Preparation of transparent glass-ceramics: Put the precursor glass in a muffle furnace, raise it from room temperature to 670°C at a rate of 5°C / min and keep it warm for 2h to obtain a light green glass-ceramic, and then polish the surface...

Embodiment 2

[0039] Except following feature, the preparation process of this example is identical with example 1:

[0040] The precursor glass molar composition of this example is: SiO2 :45%, Al 2 o 3 :22%, Na 2 O: 16%, NaF: 9%, YF 3 :8%, YbF 3 :1%, NdF 3 :0.5%, Cr 2 o 3 :0.5%.

[0041] The temperature-dependent photoemission spectrum under the condition of 980nm laser excitation (such as Figure 5 shown) shows that, with increasing temperature, 4 f 7 / 2 / 4 S 3 / 2 → 4 I 9 / 2 , 4 f 5 / 2 / 2 h 9 / 2 → 4 I 9 / 2 and 4 f 3 / 2 → 4 I 9 / 2 The emission intensity of the transition increases gradually, when the 4 f 7 / 2 / 4 S 3 / 2 → 4 I 9 / 2 and 4 f 3 / 2 → 4 I 9 / 2 The fluorescence intensity ratio of the two is used as a temperature measurement parameter, and the highest sensitivity obtained is 0.22% K -1 .

Embodiment 3

[0043] (1) Preparation of precursor glass: the molar composition is: SiO 2 :41%, Al 2 o 3 : 25%, Na 2 O: 15%, NaF: 11%, YF 3 :8%, YbF 3 :1%, ErF 3 :0.5%, Cr 2 o 3 : 0.5%, weigh 100g raw material, grind it in an agate mortar for 30min, make it fully mix. Pour the uniformly mixed material into a 200ml corundum crucible, and then put the corundum crucible into a high-temperature furnace. Firstly, the temperature was raised to 1000°C at a rate of 8°C / min, and then to 1550°C at a rate of 5°C / min, and then kept for 1 hour. Then the molten glass is quickly poured into a preheated mold at 250°C, placed in a muffle furnace heated to 500°C for 3 hours, and then cooled to below 50°C at a rate of 10°C / h to obtain a precursor glass .

[0044] (2) Preparation of transparent glass-ceramics: Put the precursor glass in a muffle furnace, raise it from room temperature to 650°C at a rate of 5°C / min and keep it warm for 2h to obtain a light green glass-ceramic, and then polish the surfa...

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Abstract

The invention discloses double-mode temperature sensing crystallized glass, which is prepared from the following raw materials in percentage by mol: 30 to 50 percent of SiO2, 20 to 30 percent of Al2O3, 10 to 20 percent of Na2O, 5 to 15 percent of NaF, 5 to 15 percent of YF3, 0.01 to 10 percent of YbF3, 0.01 to 5 percent of LnF3 and 0.01 to 5 percent of Cr2O3, wherein Ln is trivalent rare-earth ions. The invention also discloses a preparation method and application of the double-mode temperature sensing crystallized glass. The double-mode temperature sensing crystallized glass has the advantages of high speed response and high precision, and is hopeful to be developed into a novel double-mode temperature sensing device.

Description

technical field [0001] The invention relates to the field of temperature sensing, in particular to a double-mode temperature-sensing glass-ceramic as well as its preparation method and application. Background technique [0002] Traditional thermometers need to be in contact with the measured object in order to achieve temperature measurement. In many extreme conditions such as corrosive environments and living organisms, this method of measuring thermal contact has considerable limitations. In addition, traditional liquid thermometers, thermocouples, pyrometers, and thermistors are not easy to miniaturize. When the size of the measured object is small, there will be large errors in the measurement results. [0003] With the development of the times, the trend of replacing traditional thermometers with new thermometers based on material optical sensing has become irresistible. This technology uses luminescent materials as temperature probes, and detects the temperature by m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/10C03C10/16C03B19/02C03B32/02G01K11/14
CPCC03B19/02C03B32/02C03C10/0018C03C10/16G01K11/14
Inventor 董国平蔡振禄康世亮黄雄健
Owner SOUTH CHINA UNIV OF TECH