What are the factors affecting product reliability in high and low temperature test?

Date：2021-08-10 14:21:03 Views：1583

With the development of electronic technology, the degree of integration of electronic products is higher and higher, the structure is more and more subtle, the process is more and more, and the manufacturing process is more and more complex, which will produce some latent defects in the manufacturing process. The high and low temperature alternating damp heat testing machine is applicable to the adaptability of electrical, electronic, instrumentation, automotive electrical appliances, electronic parts and materials to storage and use under high and low temperature environment. It is applicable to schools, factories, military industry, scientific research, and other units to detect the performance indexes of various electronic components under high and low temperature or damp heat environment. High and low temperature test is a necessary test item for product reliability. What are the factors affecting product reliability in high and low temperature test? In order to help you have an in-depth understanding, this paper will summarize the relevant knowledge of high and low temperature testing. If you are interested in what this article will cover, read on.

Effect of low temperature on products

1. The elasticity of flexible materials such as rubber decreases and breaks;

2. The brittleness of metals and plastics increases, resulting in cracking or cracks;

3. Due to the different shrinkage coefficients of materials, when the temperature change rate is large, it will cause the moving parts to jam or rotate inflexibly;

4. The viscosity of lubricant increases or solidifies, and the friction between moving parts increases, resulting in sluggish action or even stop working;

5. The electrical parameters of components change, which affects the electrical performance of products;

6. Freezing or frosting causes product structure damage or moisture, etc.

Low temperature environmental effect

1. Harden and embrittle the material.

2. The parts are stuck due to the different shrinkage characteristics of different materials.

3. Loss of lubrication due to increased viscosity of lubricant.

4. Electrical changes (such as resistance, capacitance, etc.).

5. The function of transformer and electromechanical components changes.

6. The impact base hardens.

7. Rupture of explosives, such as ammonium nitrate.

8. Make the specimen crack and embrittlement, change the impact strength and reduce the strength.

9. Glass produces static fatigue.

10. Condense and freeze water.

11. Reduce human dexterity and degrade hearing and vision.

12. Change the combustion rate.

Effect of high temperature on products

1. Due to the different expansion coefficients of various materials, the bonding and migration between materials are caused;

2. Loss of lubricant or reduction of lubrication performance, increasing wear between moving parts;

3. Deformation of sealing packing, gasket, seal, bearing and rotating shaft;

4. Mechanical failure or complete failure due to bonding;

5. The electrical parameters of components change, affecting the electrical performance of products;

6. Overheating of transformer and electromechanical components;

7. Combustion or explosion caused by flammable or explosive materials;

8. The internal pressure of the seal increases, resulting in rupture;

9. Aging, discoloration, blistering, cracking or cracking of organic materials;

10. The insulation performance of insulating materials is reduced.

High temperature environmental effect

1. The parts are stuck due to the different expansion characteristics of different materials;

2. The lubricant loses its viscosity, resulting in the loss of lubricant and the loss of lubrication of the contact;

3. Change the size of the test piece in whole or in part;

4. Mechanical or total failure caused by skew, jamming and failure of packaging, gasket, seal, bearing and main shaft;

5. Permanent deformation of gasket (colloidal);

6. Deterioration of air tightness function;

7. Change of resistance value;

8. The stability of the circuit changes with the temperature gradient and the different expansion characteristics of the material;

9. Overheating of transformers and electromechanical components;

10. Change the action / inaction margin of relay and magnetic and hot starting components;

11. Shorten operating life and idle time;

12. The internal crystal structure of solid material is separated;

13. High pressure is generated inside the closed test piece;

14. Accelerating the combustion of explosives and propellers;

15. Explosive casting shell expansion;

16. Explosive dissolution and exudation;

17. Deterioration and fracture of organic materials.

Effect of temperature change on products

1. The coating layer of components falls off, the potting materials and sealing compounds crack or even break the sealing shell, and the filling material leaks, which reduces the electrical performance of components;

2. Products made of different materials are heated unevenly when the temperature changes, resulting in product deformation, cracking of sealing products, and breakage of glass or glassware and optics;

3. The large temperature difference will cause condensation or frost on the surface of the product at low temperature, and evaporate or melt at high temperature. Such repeated action will lead to and accelerate the corrosion of the product.

Environmental effect of temperature change

1. Breakage of glass products and optical equipment;

2. The movable parts are stuck or loose;

3. Structure separation;

4. Electrical change;

5. Electronic or mechanical failure due to rapid condensation or icing;

6. Rupture in granular or striate form;

7. Different shrinkage or expansion characteristics of different materials;

8. Component deformation or fracture;

9. Cracking of surface coating;

10. Air leakage in the sealed cabin.

The above is the relevant answer to the "factors affecting product reliability in high and low temperature testing". Shenzhen Chuangxin testing company has dozens of professional engineers and industry elite teams, and has three standardized laboratories with an area of more than 1000 square meters. It can undertake electronic component testing and verification, IC authenticity identification, product design and material selection, failure analysis, function testing Factory incoming inspection, tape braiding and other test items. If you have any needs related to the inspection and testing of electronic products, please call Chuangxin testing, and we will serve you wholeheartedly.