热电偶温度传感器灌封工艺方法

Process of pouring to temperature sensor of thermocouple

使用原有工艺制备的热电偶温度传感器曾多次出现热偶丝断线问题,不能满足发动机高工况、长时间的热试车和飞行环境要求。为了提高传感器的可靠性,采用玻璃灌封工艺,从8-2玻璃粉、无碱玻璃纤维套管的选用和烧结工艺两方面进行研究,确定了合理的工艺参数。利用上述工艺方法生产的传感器无大气泡存在,并经过1950s的试车考核,传感器未出现断线问题。新的灌封材料、灌封工艺、烧结工艺使传感器具有在强振动条件下可靠工作的特点,提高了传感器的结构可靠性。

Temperature sensor of thermocouple prepared by the original process method often encounter fracture, which can t meet the demand of LOX/kerosene engine hot test and flight at higher working condition and longer working time.Considering the reliability of the sensor, a new pouring process based on frosting was ascertained from the aspects of selection of 8 - 2 frosting and alkali-free glass fiber sleeve, sintering process.And then reasonable process parameters were obtained.The sensor produced by the new pouring process does’t have big air bubble, and examined by hot test of 1 950 seconds, resolves the fracture problem of the thermocouple.With new pouring material, pouring technology and sintering technology, this type of sensor has the advantages of reliable working in the strong vibration condition.