Because of good oxidation resistance at high temperature and excellent mechanical properties of Ni_3Al and high hot hardness, and good oxidation resistance of chromium carbide, chromium carbide particle reinforced Ni_3Al matrix composite would possess excellent wear resistance at elevated temperature. Cr_3C_2-NiAl-Ni welding wire was produced by pressureless sintering process in vacuum. When the welding wire was welded on the surface of carbon steel, under the action of the physical heat of arc, NiAl reacted with nickel to form Ni_3Al and carbide particle reinforced Ni_3Al matrix composite was formed on the welding layers. Cr_3C_2 was dissolved during welding and dispersed Cr_7C_3 was formed, which strengthened the Ni_3Al matrix significantly. The Cr_7C_3-Ni_3Al interface was broadened, and a zone of interdiffusion and a new phase M_ 23 C_6 were formed, indicating that a good bond has been formed. The hardness of Cr_7C_3/Ni_3Al composite at room and elevated temperatures is much higher than that of stellite alloys. In addition, Cr_7C_3/Ni_3Al composite possesses better high temperature oxidation resistance than stellite 12 alloy. So Cr_7C_3/ Ni_3Al composite can become an attractive potential candidate for elevated temperature wear-resistant surface material. Because of good oxidation resistance at high temperature and excellent mechanical properties of Ni_3Al and high hot hardness, and good oxidation resistance of chromium carbide, chromium carbide particle reinforced Ni_3Al matrix composite would possess excellent wear resistance at elevated temperature. Cr_3C_2-NiAl-Ni welding wire was produced by pressureless sintering process in vacuum. When the welding wire was welded on the surface of carbon steel, under the action of the physical heat of arc, NiAlilized with nickel to form Ni_3Al and carbide particle reinforced Ni_3Al matrix composite was formed on the The Cr_7C_3-Ni_3Al interface was broadened, and a zone of interdiffusion and a new phase M_ 23 C_6 were formed, indicating that a good bond has The hardness of Cr_7C_3 / Ni_3Al composite at room and elevated temperatures is much higher than that of stellite alloys. In addition, Cr_7C_3 / Ni_3Al composite possesses better high temperature oxidation resistance than stellite 12 alloy. So Cr_7C_3 / Ni_3Al composite can become an attractive potential candidate for elevated temperature wear-resistant surface material.