高压气举阀测试装置及现场试验

为了研究气举阀在高压大排量下的工作特性,设计了高压气举阀测试装置。该装置由气源供应系统、试验测试装置、电气仪表系统、管路系统、放空系统、计量系统、数据采集及处理系统与试验操作台等组成,可用于还原压力测试、打开压力测试、不同温度对打开压力影响测试,并通过远程控制系统实时采集数据。试验结果表明:直径9和10 mm的阀杆更适合与此次试验气举阀的阀球、阀座配套使用;气举阀预充压力对打开压力有一定比例的放大作用,呈线性正相关关系,预充压力越大,打开压力越大;打开压力与温度呈线性正相关关系,随加热温度的升高打开压力逐渐增大;预充压力越大,打开压力受温度的影响越大。研究结果可为气举阀在高压下的工作状态研究提供参考。

Facile synthesis of Ca-SiAlON:Eu^(2+) phosphor by the microwave sintering method and its photoluminescence properties

Pure Ca-SiAlON:Eu2+ was synthesized by microwave sintering method at a relatively low temperature of 1550℃.Photoluminescence intensity of the resultant phosphor was higher than those of the samples synthesized by conventional gas-pressure sintering technique at 1750℃.When it was excited at 450 nm,the as-prepared yellow Ca-SiAlON:Eu2+ sample had an external quantum efficiency of 42%,comparable to the sample synthesized at 1750℃ under 0.5 MPaN2 gas pressure by the GPS method reported in reference.The experimental results demonstrated that the microwave sintering method was also an interesting approach for synthesizing nitride phosphors,which promises lower firing temperature than those by carbothermal reduction and nitridation (CRN) methods,higher heating rate and shorter duration time compared with those by gas-pressure sintering.