| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress aging in the resistance of a thick film resistor. SOLUTION: The thick film resistor paste contains powder of two kinds of glass A, B wherein the glass A of higher mixing ratio contains 20-26wt.% of CaO, 37-59wt.% of SiO2 , 5-13wt.% of Al2 O3 and 8-28wt.% of B2 O3 totaling 95wt.% or more whereas the glass B of lower mixing ratio contains 53-72wt.% of SiO2 , 20-30wt.% of B2 O3 , and 1-7wt.% of Na2 O totaling 85wt.% or more. Mixing ratio of the glass A to the total mixing amount of the glasses A, B is set at 73-99wt.% while that of the glass B is set at 27-1wt.%. The two kinds of glass A, B contain no Pb, Cd nor Ni which may have adverse effect on the environment. The glass A of higher mixing ratio has a coefficient of thermal expansion higher by 0.5×10<-6> /deg or more than that of the glass B of lower mixing ratio and a flexure point higher by 30 deg.C or more than that of the glass B.</p> |
