Compound polyimide retainer storage life prediction method

A composite polyimide, storage life technology, applied in the direction of applying stable tension/pressure to test material strength, mechanical bearing testing, special data processing applications, etc., can solve problems such as gaps and different structures, and achieve small physical strength, The effect of short test period and high prediction accuracy

Active Publication Date: 2015-12-16
LUOYANG BEARING RES INST CO LTD
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Problems solved by technology

However, there are many types of polyimide structures, different structures, and different aging mechanisms. The prediction results obtained by using a unified accelerated aging test method without discrimination must be very different from the actual storage life; in addition, due to Polyimide itself is resistant to aging and has good performance stability. If the accelerated aging test is only used, because the test conditions are very different from the actual storage conditions, this will also cause the use of this accelerated aging test in the prior art for prediction. Significant gap between method predictions and actual shelf life

Method used

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  • Compound polyimide retainer storage life prediction method
  • Compound polyimide retainer storage life prediction method
  • Compound polyimide retainer storage life prediction method

Examples

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Embodiment 1

[0039]A method for predicting the storage life of a composite polyimide cage, comprising the following steps:

[0040] The first step: Determine the aging mechanism of the composite homoanhydride polyimide cage that needs to predict the storage life, as follows:

[0041] Put two groups of samples of composite homoanhydride type polyimide cages with the same quantity into a humid heat aging box with a temperature of 90°C and a humidity of 90%RH and a high-temperature aging box with a temperature of 90°C, every 10 days , take out 5 (or 3 or 4) samples for tensile strength test;

[0042] After testing for 5000 hours respectively, the tensile strength of the composite homoanhydride type polyimide cage in the humid heat aging box dropped from 85MPa to 55MPa, and the drop rate reached 35%, exceeding 30%. The tensile strength of the composite homoanhydride type polyimide cage does not change, that is, the performance decline rate is zero, so it is judged that the aging mechanism of ...

Embodiment 2

[0065] A method for predicting the storage life of a composite polyimide cage, comprising the following steps:

[0066] The first step: determine the aging mechanism of the composite ether anhydride polyimide cage, as follows:

[0067] Put the same or different two groups of the same composite ether anhydride type polyimide cage samples into the 90°C, 90%RH humidity heat aging box and the 90°C high temperature aging box, and take them out every 30 days. 5 (or 3 or 4) specimens are tested for tensile strength.

[0068] After the two groups of samples were tested for 5000 hours, the tensile strength of the two groups of samples did not change significantly. Therefore, it is judged that the aging mechanism of the composite ether anhydride type polyimide cage is thermo-oxidative aging.

[0069] It is also possible to further use Fourier transform infrared to analyze the internal structure of the material. It was found that the characteristic peaks of the new substances generate...

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Abstract

A compound polyimide retainer storage life prediction method comprises the steps of firstly, determining the aging mechanism of a compound polyimide retainer, conducting a hydrothermal aging test if the aging mechanism is hydrolysis aging, and conducting high-temperature aging test if the aging mechanism is thermo-oxidative aging; secondly, conducting an artificial accelerated aging test with a corresponding test method according to the aging mechanism, determined in the first step, of the compound polyimide retainer, and substituting data obtained from the test into a corresponding prediction model for storage life prediction. By the adoption of the method, test cycle is short, manpower and material resources are saved, and prediction precision is high.

Description

technical field [0001] The invention relates to a method for predicting the storage life of a non-metal cage, in particular to a method for predicting the storage life of a composite polyimide cage. Background technique [0002] The composite polyimide cage has outstanding thermal stability, high temperature resistance, radiation resistance, high specific strength, and excellent tribological properties in high temperature, high speed and other environments. And other weapons and equipment bearings have been widely used. [0003] In the production and use of bearings, in order to avoid safety problems or other failures caused by the use of failed bearings, it is necessary to know the storage life of bearings in advance (storage life refers to the time when the product can still meet the specified quality requirements when it is stored under specified conditions. The length of time), and knowing the storage life of the bearing can also determine the production quantity of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18G01M13/04G06F19/00
Inventor 李媛媛孙小波楚婷婷王子君李文超王枫
Owner LUOYANG BEARING RES INST CO LTD
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