Catalytic effect of platinum and silver in a hydrogen peroxide monopropellant ceramic microthruster  

作　　者：Zahra Khaji Lena Klintberg Kristoffer Palmer Greger Thornell 

机构地区：[1]Angstrom Space Technology Centre.Department of Engineering Sciences,Uppsala University.Box 35,Uppsala.75103,Sweden [2]Division of Microsystems Technology,Department of Engineering Sciences,Uppsala University,Box 35.Uppsala.75103,Sweden [3]Nanospace AB,Ulis Tag 29A.Uppsala,75651,Sweden

出　　处：《Propulsion and Power Research》2020年第3期216-224,共9页推进与动力（英文）

基　　金：The Swedish National Space Board and the Centre for Natural Disasters Science(CNDS)are acknowledged forproject funding;The Knut and A lice Wallenberg Foundation is acknowledged for funding the laboratory facilities;Peter Sturesson at the Department of Engineering Sciences,Uppsala University is gratefully thanked for help with the SEM.Dhananjay V.Barbade,who participated in the previous study,is appreciated for inspiration to this work.

摘　　要：Ceramic microthrusters with an embedded Pt resistive heater,two temperature sensors,and a Pt or Ag catalytic bed were made of high-temperature co-fired alumina ceramics.To increase the surface area by a factor of 1.21,and so the catalytic effect,the Pt catalytic bed was made porous by mixing the Pt paste with 15—20vol.%graphite sacrificial paste before screen printing it.Ag was in-situ electroplated on the porous Pt surface after sintering.Decomposition of 50wt.%hydrogen peroxide as a monopropellant was studied both qualitatively and quantitatively by changing the catalyst(between Ag and Pt),flow rate(15—55 μl/min),and operating temperature(115—300℃).A reference device without catalyst exhibited an unstable behavior as a result of no,or vety little,decomposition,whereas the Ag catalyst was more stable,and the Pt one even more stable.Also,Pt was found to be slightly more effective.Quantitatively,there were small differences between Pt and Ag in the power needed to maintain the temperature.The inventive methods to make the Pt bed porous as well as in-situ electroplating Ag were success-fully demonstrated.

关 键 词：Monopropellant microthruster HTCC Catalytic bed PLATINUM SILVER Hydrogen peroxide ELECTROPLATING 

分 类 号：O64[理学—物理化学]