Ceramic quadrupole for mass spectrometer
The performance of the quadrupole, one of the core components of a mass spectrometer, directly determines the resolution, sensitivity and stability of the instrument. Traditional metal quadrupoles are gradually being replaced by high-performance ceramic quadrupoles due to problems such as insufficient thermal stability and mass discrimination effect. Material selection of ceramic quadrupoles 1.Material comparison Material Al2O3 AlN BeO SiC Thermal conductivity 20-30 W/mK 170-200 W/mK 300 W/mK 120-200 W/mK Dielectric loss Medium Low Very low Low Coefficient of thermal expansion 8.0×10⁻⁶/K 4.5×10⁻⁶/K 7.5×10⁻⁶/K 4.0×10⁻⁶/K 2.Key material performance requirements -High thermal conductivity: fast heat dissipation, reducing field distortion caused by thermal deformation. -Low dielectric loss: avoid radio frequency (RF) signal attenuation. -High dimensional stability: extremely low thermal expansion under temperature fluctuations (CTE matching metal electrode...