MLCC (Multi-layer Ceramic Capacitor) components experience wide temperature variations in application scenarios. In automotive electronics and industrial control equipment, components are repeatedly subjected to alternating hot and cold conditions, making ceramic dielectrics prone to micro-cracks caused by thermal stress. High-purity magnesium oxide can improve the thermal shock resistance of MLCC ceramics and enhance component environmental adaptability. Messi Biology’s electronic-grade high-purity magnesium oxide empowers MLCCs to enhance stability under thermal cycle operating conditions.
When ceramic materials undergo rapid temperature changes, internal thermal stresses are generated. Once the stress exceeds the material’s tolerance limit, micro-cracks appear and gradually propagate, leading to capacitor leakage, capacitance attenuation, or even failure. Magnesium oxide features a high melting point and a low coefficient of thermal expansion. When doped into the barium titanate ceramic system, it can adjust the overall thermal expansion coefficient of the composite material, narrow the thermal expansion difference between the ceramic dielectric layer and the inner electrodes, reduce the thermal stress generated at the interface during temperature changes, and lower the probability of micro-crack generation.
At the microstructural level, magnesium oxide refines ceramic grains. Fine-grained ceramics possess better toughness and are capable of buffering thermal stress. Coarse-grained structures have fewer grain boundaries, making them prone to intergranular cracking after stress concentration; uniform fine-grained structures can disperse thermal stress, inhibit crack extension, and enhance the ceramic’s ability to resist sudden temperature changes. In high- and low-temperature cycle reliability tests, MLCC dielectric layers added with Messi Biology’s high-purity magnesium oxide can reduce performance degradation caused by thermal cycling and extend the service life of components.
Powder purity has a significant impact on thermal shock performance. The thermal expansion coefficient of secondary phases formed by impurities differs greatly from that of the matrix, making the interface between the impurity phases and the matrix prone to crack initiation under thermal cycling. Messi Biology’s high-purity magnesium oxide strictly controls impurities such as iron and alkali metals to prevent the formation of secondary phases, ensuring a pure and stable ceramic matrix structure. The powder features excellent dispersion, resulting in a uniform green body composition after tape casting, eliminating local compositional segregation and preventing stress concentration triggered by inconsistent local thermal expansion.
In scenarios with large temperature fluctuations, such as new energy vehicle electronic controls and outdoor communication base stations, MLCCs with good thermal shock resistance form the foundation for stable system operation. Messi Biology can cooperate with customers to conduct high- and low-temperature cycle reliability tests, adjusting powder specifications according to application working conditions to help MLCC manufacturers enhance product environmental tolerance.