A process for joining a stainless steel part and a zirconia ceramic part comprising: providing a SUS part, a ZrO2 ceramic part, a Mo foil and a Cu foil; depositing a nickel coating on a surface of the ZrO2 ceramic part; placing the ZrO2 ceramic part, the Mo foil, the Cu foil, and the SUS part into a mold, the Mo foil and the Cu foil located between the ZrO2 ceramic part and the SUS part; placing the mold into a chamber of a hot press sintering device, heating the chamber and pressing the SUS part with the nickel coating, the ZrO2 ceramic part, the Mo foil, and the Cu foil at least until the SUS part, the ZrO2 ceramic part, the Mo foil and the Cu foil form a integral composite article.