The present invention relates to a non-precious metal alloy composition for dental porcelain parts, in detail The present invention relates to a non-precious metal alloy composition in which yttrium (Y) is added to suppress blue rusting in the bonding process with porcelain and to increase the bonding strength with porcelain (porcelain). The composition is as follows. 67-69% by weight of nickel, 15-17% by weight of chromium, 6.5-7.5% by weight of molybdenum, 1.5~2% by weight of silicon, 2,5~3% by weight of aluminum, Tin 0.8-1.2 wt%, manganese 0.3-0.5 wt%, niobium 1.8-2.1 wt%, yttrium 0.2-0.5 wt%.본 발명은 치과도재소부용 비귀금속 합금 조성물에 관한 것으로서, 상세하게는 도재와 결합과정에서 청녹화 현상을 억제하고, 도재(포세린)와의 결합강도를 높이기 위해 이트륨(Y)을 첨가한 비귀금속 합금 조성물에 관한 것이다.조성물은 다음과 같다.니켈 67~69중량%, 크롬 15~17중량%, 몰리브덴 6.5~7.5중량%, 실리콘 1.5~2중량%, 알루미늄 2,5~3중량%,주석0.8~1.2중량%, 망가니즈 0.3~0.5중량%, 나이오븀 1.8~2.1중량%, 이트륨 0.2~0.5중량% 를 포함한다.
