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Research on Preparation of Miniature Ceramic Heater

Author: ZhouLei
Tutor: XiaFeng
School: Huazhong University of Science and Technology
Course: Materials Science
Keywords: Oxygen sensor Ceramic heater Cast molding Tungsten thick film pastes Co-sintering
CLC: TB657.5
Type: Master's thesis
Year: 2009
Downloads: 70
Quote: 0
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Abstract


Tube type oxygen sensor widely used on the market due to the reach of the onset temperature is slow, and therefore its heating, the introduction of the heater is installed in an oxygen sensor as a separate member is necessary . In this thesis , ceramic heater pipe oxygen sensor on the basis of laboratory predecessors . Select 75 ceramic heater support body and the material of the protective layer , further study of the preparation process of the protective layer of the heater , and to explore the main factors to affect the green the quality of the cast . The viscosity test was visually observed and SEM tests studied the mechanism of the role of the binder , discusses the influence of the binder on the molding quality of the protective layer green body ; and a binder and a plasticizing agent the proportion of the protective layer the billet quality impact, eventually stabilize the cast molding process of the green body of the protective layer . The heat generation of the heater circuit is tungsten thick film paste is printed by screen printing after the green body on the protective layer , and the assembly of the support body of burning the resulting . Tungsten thick film paste formulation and preparation process , tungsten thick film pastes is determined inorganic binder, - the formulation of the glass frit , by thermal analysis test , XRD test of the prepared glass frit performance analysis and evaluation , and frit formulations optimized ; morphology observed fever film and the substrate co-sintered frit addition on the printing characteristics of thick film pastes fever membrane with 75 ceramic substrate the total skim sintering as well as sintering after heating film side blocking size . Study of the assembly process of the protective layer of the heater and the support body and the total sintering behavior . Determine the appropriate assembly binder, and studied the mutual influence of the shrinkage of the protective layer and the supporting body in co-sintering process , determine a suitable protective layer and the loading of the supporting body . Sintering atmosphere 75 porcelain sintered density and reducing atmosphere (H 2 ) to promote the 75 porcelain dense sintering mechanism . Finally , the reducing atmosphere in the co-sintering process is optimized.

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CLC: > Industrial Technology > General industrial technology > Refrigeration Engineering > Refrigeration machinery and equipment > Refrigeration Equipment > Heat exchange equipment
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