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Gold p ell ets were mcl t('d 0 11 p laques of po l ished f used sil ica in vacu um and t hcll hc"tcd for 15 minutes at 1,100° C under d iffer ent oX,vgen pressures, T he force l'C'q lllred "t room temper ature to shear t he solidifi ed pellet s f rom t he sili ?a slll'face was found to vary from zero for gold mel ted in vac uu m to 72 ,~ pound s pCI' sq uare IIlch fOl' go ld !~lo l ted , ulld er an uxygen p r essure of 150 mil li meter s of mercu ry, .. In a ll cases where bond d evcJ0r.>ed , f ract ur c occurred in the silica rat her t ha n at t he gold-sil ica In te rface, Sili ca plaq ues WIth pell ets bo nded to t hem by t reatment in oxygen sholVE'd no measurabl e strain wh en cxamill ed With a po larograph , suggest ing t hat t he gold had ,yIelded as t he sp eCImen cool ed . . . .' . ' T ests using AUl9S as a tracer I!1d lcated t hat g?ld d Iffused Into ,t he SIlI ca lattICe at hIgh oxygen pressure but t hat no d iffusion occurred dUJ'lng Vfl,cuum h eatlll ~. Obse r vatJOns made on mo l te n droplets showed no co rrelat ion between t he co ntact angles III all' and vacu um and t he apparent shear str engths. A possible cx planation is included to accoun t f or t hIS l ac k of agreement wi t h t heo ry,

Effect of oxygen on the bonding of gold to fused silica