Metal ceramic CT bulb tube and preparation technology thereof

Abstract

The invention discloses a metal ceramic CT bulb tube. A metal casing surface of the CT bulb tube is coated with a Fe3O4 coating, and the thickness of the coating is controlled in a range of 0.01-0.08mm. The invention further discloses a technology of the metal ceramic CT bulb tube. The technology comprises steps as follows: 1), the coated metal casing matrix surface is subjected to sand blastingtreatment in advance; 2), the metal casing matrix surface is coated with the Fe3O4 coating with a plasma spraying technology, thermal radiation coefficient of a metal casing can be increased, and thermal radiation absorption capability of the metal casing is improved.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a cermet CT tube and a preparation process thereof. Background technique [0002] Glass CT tubes are often used in CT tubes with low heat capacity. The outer shell is made of glass. Due to the low tensile strength of glass, it is fragile, can withstand small thermal stress, and has poor heat dissipation performance, which cannot meet the requirements of large heat capacity CT tubes. tube use. [0003] The metal vapor produced by the glass CT bulb will adhere to the inner wall of the glass shell, especially at the X-ray window. Since the metal vapor reduces the light transmittance of the glass in this part, the heat absorbed by the vapor will cause the temperature of this part to be high , resulting in greater thermal stress, and cracks appear when the tensile strength of the glass is exceeded, which affects the service life of the bulb. [0004] The metal-ceramic CT tube transm...

AI Technical Summary

Problems solved by technology

The surface of the metal shell without surface treatment is light-colored, the thermal radiation coefficient is low, the efficiency of absorbing the heat of the target surface through thermal radiation is low, and the heat dissipation performance is poor

[0005] Cr 2 o 3 、Al 2 o 3 or TiO 2 / Al 2 o 3 Coating, this type of coating is dark and has a certain thermal radiation coefficient. Because of its high melting point, it also has good high temperature stability and vacuum performance, but it is a ceramic material, which is non-conductive and cannot pass through the metal shell. The grounding will take away the secondary electrons scattered on the inner surface of the metal shell, which will cause the electrons to gradually accumulate in the metal shell close to the window of the target surface, so that an electromagnetic field of a certain intensity will be formed in this area. The existence and enhancement of this electromagnetic field will affect the cathode The movement of the emitted electron beams causes varying degrees of impact, which is not conducive to the generation of X-ray beams. In addition, the positive high voltage at the anode end and the metal shell area adjacent to the cathode end with secondary electrons will form a close-range high-voltage electric field, which reduces the impact of the tube. Dielectric strength, it is easy to cause the bulb to spark between the two poles, and reduce the service life of the bulb