What are the key characteristics of ceramic resistors? What are the characteristics of ceramic resistors
* 来源: * 作者: admin * 发表时间: 2015-07-15 15:42:49 * 浏览: 174
The key characteristics of ceramic resistors involve structure, material characteristics, power, power density and particle conductive solid core structure. The resistors absorb energy uniformly and conduct electricity as a whole without wire failure. The main component is mixed ceramic powder, which has chemical inertness and thermal stability. Can withstand peak value power; The power density is higher. Small size, the same large size can withstand more power and energy. It relies on the contact between particles to conduct electricity, and the whole exhibits the noninductive characteristic.
Ceramic resistance is characterized by
High temperature is fired, do not fade, do not absorb water, do not deform, easy to clean, some ceramics can be used for microwave oven, harmless to human body.
Advantages of ceramic resistance:
1. High mechanical strength;
2. Good wear resistance and corrosion resistance;
3. Good thermal stability;
4. Rich raw materials and low price;
5. The product is environmentally friendly and pollution-free.
Ceramic resistance defect:
1. Large brittleness, low impact resistance and fragile;
2. Low ability of post-processing;
3. Products are not easy to be recycled.
What are the key characteristics of ceramic resistors
I. Mechanical properties of ceramics
Ceramics have no plastic deformation at room temperature, and their compressive strength is large, but their tensile, bending and impact strength are small, showing that they are easy to brittle fracture. According to the ratio of materials, the theoretical strength of ceramics is very high, but the actual strength is only about 1% of the theoretical strength. The reason is that the conditions and processes of ceramic sintering are different, and the polyphase structure is also different. In addition, when ceramics are heated to the critical temperature, they creep, which is more obvious at high temperature. In other words, the creep of PFM often pulls the metal deformation in the sintering process, especially the repeated sintering of multi-unit PFM crown bridge makes the deformation more likely.
Second, the strengthening of ceramics
Because ceramics exhibit brittle fracture, they cannot resist in oral environment. To this end, scholars all over the world are committed to the strengthening of ceramics
Third, the characteristics of porcelain
One method of ceramic strengthening is to burn ceramics on the surface of the metal, using the strength of the metal while retaining the aesthetic and plastic shape of the ceramics. But the effect of this strengthening measure is limited, mainly depends on the binding force of gold porcelain.
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