Crystallinity-based nuclear power PEEK material thermal aging mechanism evaluation method
A technology of crystallinity and thermal aging, which is applied in the direction of applying stable tension/pressure to test the strength of materials, analyzing materials, and conducting material analysis through optical means. It can solve the problems of high cost of use and replacement, difficulty in replacement, and material inspection. Problems such as difficulty in maintenance and use, to achieve the effect of improving accuracy and improving accuracy
Pending Publication Date: 2020-09-29
CGN DELTA TAICANG TESTING TECH CO LTD
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Problems solved by technology
At present, there is basically no judgment on thermal aging of PEEK materials from the aspect of crystallinity, especially by combining multiple methods to calculate crystallinity.
In addition, the particularity of the use environment of PEEK materials leads to great difficulties in the daily routine inspection and maintenance of the materials. It is difficult to replace the materials after aging and cracking, and the cost of use and replacement is high.
Method used
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Embodiment
[0048] A method for evaluating the thermal aging mechanism of PEEK materials for nuclear power based on crystallinity, comprising the following steps:
[0049] Step 1. Perform accelerated heat aging treatment on the nuclear power PEEK material after slice treatment at different times at the same temperature, and quickly simulate the heat aging process of the PEEK material; among them, the temperature is selected as 310°C, and the temperature is 0h, 96h, 168h, 240h, and 336h respectively. , 504h thermal oxygen aging treatment, the nuclear power PEEK material after slice treatment is dumbbell-shaped, and its thickness is 0.5mm.
[0050] Step 2. Obtain mechanical property parameters and crystallinity of the PEEK material after step one is processed; Described mechanical property parameters comprise tensile strength and elongation at break, and the measuring method of described crystallinity comprises XRD analytical method, DSC analytical method and Infrared spectroscopy.
[0051...
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Abstract
The invention provides a crystallinity-based nuclear power PEEK material thermal aging mechanism evaluation method. The method comprises the following steps: step 1, performing accelerated thermal aging treatment on a nuclear power PEEK material subjected to slicing treatment at the same temperature for different times, and rapidly simulating a thermal aging process of the PEEK material, wherein the temperature is 300 to 330 DEG C; step 2, acquiring mechanical property parameters and crystallinity of the treated PEEK material, wherein the mechanical property parameters comprise tensile strength and elongation at break, and the crystallinity determination method comprises an XRD analysis method, a DSC analysis method and an infrared spectrum analysis method; and step 3, determining the change rule of the crystallinity in the thermal aging process according to the mechanical property parameters and the relationship between the crystallinity and the thermal aging time, thereby evaluatingthe thermal aging mechanism of the PEEK material according to the crystallinity. The problem that no method for evaluating the thermal aging mechanism of the PEEK material from the perspective of crystallinity exists at present is solved.
Description
technical field [0001] The invention relates to the technical field of diagnosis of insulating materials used in nuclear power plants, in particular to a crystallinity-based method for evaluating the thermal aging mechanism of PEEK materials used in nuclear power plants. Background technique [0002] PEEK (polyether ether ketone) material is a kind of special engineering plastics. Its main chain structure contains repeating units of one ketone bond and two ether bonds. The glass transition temperature is 143°C and the melting point is 334°C. Although PEEK is a semi-crystalline polymer, its internal crystallinity is relatively low, with a maximum crystallinity of 48%, while the crystallinity of PEEK in injection molding production is usually between 25% and 40%, that is, It is said that there are a large number of amorphous regions in the interior of PEEK. The molecular chains in the amorphous region are in disordered micro-Brownian motion. Due to the large number of amorpho...
Claims
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Login to View More IPC IPC(8): G01N3/08G01N21/3563G01N25/06G01R31/12
CPCG01N3/08G01N21/3563G01N25/06G01R31/1263G01N2203/0222G01N2203/0676Y02E30/30
Inventor 曹丹李建喜刘鹏周城张海松
Owner CGN DELTA TAICANG TESTING TECH CO LTD