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High-temperature sliding wear, elastic modulus and transverse rupture strength of Ni bonded NbC and WC cermets
International Journal of Refractory Metals & Hard Materials ( IF 4.2 ) Pub Date : 2019-11-04 , DOI: 10.1016/j.ijrmhm.2019.105143
R.M. Genga , P. Rokebrand , L.A. Cornish , N. Nelwalani , G. Brandt , N. Kelling , M. Woydt , A. Janse van Vuuren , C. Polese

The effects of rapid pulse electric current sintering (PECS), substitution of WC by NbC and Co by Ni, and carbide additives (TiC and Mo2C) on the microstructure, elastic modulus, B3B transverse rupture strength (TRS) and high temperature sliding wear on WC-Co, WC-Ni, NbC-Co and NbC-Ni cermets were studied. Additions of x% Mo2C and y% TiC (where x and y were <10 wt%), coupled with PECS, significantly refined the NbC-Ni cermet's carbide grain size from ~5.0 μm to <0.8 μm, giving mechanical properties comparable to WC-Co and WC-Ni cermets: >14 GPa hardness and ~10 MPa.m1/2 fracture toughness (KIC) and ball-on-three-balls (B3B) TRS > 1600 MPa. The sintering techniques had negligible effect on the samples' elastic and shear modulus, and all WC-based samples had higher elastic modulus than all NbC-based samples (by ~120 GPa). High temperature sliding wear tests were carried out using a ball-on-disk tribometer, with a 10 N force, at a sliding speed of 1.34 m/s for 0.8 km (10 min) and 2.4 km (30 min), using 100Cr6 (AISI 52100) steel balls at 400 °C and 0% humidity. For the 2.4 km sliding distance, all the WC cermets had lower wear volumes than NbC cermets, with LPS WC-0.5Cr3C2-10Co having the lowest wear volume. Additions of TiC and Mo2C to NbC-12Ni improved the sliding wear resistance, with TiC having the greater effect, reducing the sample wear rate by over 30% from 15.1 × 10−6 mm3/N·m to 9.4 × 10−6 mm3/N·m after sliding distance of 2.4 km. Generally, the LPS samples had lower wear volumes than the corresponding SPS samples, due to higher K1c and TRS.



中文翻译:

Ni键结合的NbC和WC金属陶瓷的高温滑动磨损,弹性模量和横向断裂强度

快速脉冲电流烧结(PECS),用NbC替代WC并用Ni替代Co和碳化物添加剂(TiC和Mo 2 C)对组织,弹性模量,B3B横向断裂强度(TRS)和高温滑动的影响研究了WC-Co,WC-Ni,NbC-Co和NbC-Ni金属陶瓷的磨损。添加x%Mo 2 C和y%TiC(其中xy <10 wt%),再加上PECS,可将NbC-Ni金属陶瓷的碳化物晶粒尺寸从5.0μm显着细化到<0.8μm,可提供可比的机械性能到WC-Co和WC-Ni金属陶瓷:硬度> 14 GPa和〜10 MPa.m 1/2断裂韧性(K IC)和三对球(B3B)TRS> 1600 MPa。烧结技术对样品的弹性模量和剪切模量的影响可忽略不计,所有基于WC的样品的弹性模量均高于所有基于NbC的样品(约120 GPa)。使用圆盘摩擦计在10 N的力下以1.34 m / s的滑动速度进行0.8 km(10 min)和2.4 km(30 min)的高温滑动磨损测试,使用100Cr6( AISI 52100)钢球在400°C和0%湿度下。对于2.4 km的滑动距离,所有WC金属陶瓷的磨损量均低于NbC金属陶瓷,其中LPS WC-0.5Cr 3 C 2 -10Co的磨损量最低。TiC和Mo 2的添加C至NBC-12Ni改善的滑动的耐磨损性,与具有更大的影响的TiC,30%以上的15.1×10降低采样磨损率-6 毫米3 / N·m至9.4×10 -6 毫米3 / N·米后滑行距离为2.4公里。通常,由于较高的K 1c和TRS ,LPS样品的磨损量比相应的SPS样品低。

更新日期:2019-11-04
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