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Influence of the processing route on the properties of Ti(C,N)-Fe15Ni cermets
International Journal of Refractory Metals & Hard Materials ( IF 4.2 ) Pub Date : 2019-08-06 , DOI: 10.1016/j.ijrmhm.2019.105046
M. de Nicolás , H. Besharatloo , J.M. Wheeler , M. de Dios , P. Alvaredo , J.J. Roa , B. Ferrari , L. Llanes , E. Gordo

This study aims to understand the influence of powder preparation and processing steps on the microstructure and properties of Ti(C,N)-Fe15Ni cermets with 70 and 80 vol% of ceramic phase. Two routes were used for powder preparation: (i) a colloidal approach, consisting of the preparation of stable aqueous suspensions of the powder particles and spray-drying to obtain easy-to-press granules, and (ii) conventional powder metallurgy route, consisting on wet ball milling of powders, with subsequent drying in rotary evaporator. The resultant powder mixtures were uniaxially pressed and sintered in high-vacuum at 1450 °C for 2 h. Sintered samples were characterized in terms of their density, porosity, microstructure (FESEM, image analysis), composition (EDX and XRD), small-scale hardness and sliding contact response by means of massive nanoindentation and nanoscratch testing. C content of the mixture powders was lower for conventional route, lost during milling. After sintering, all the materials, despite the processing route and composition, show C reduction, although that outflow is higher for the conventional powder metallurgy route, and more evident for the composition with higher binder content. As a result, COL samples exhibit a more homogeneous microstructural assemblage, higher small-scale hardness and mechanical integrity under sliding contact conditions. Compositions of materials must then be adjusted to adequate initial C addition with respect to the employed processing route, to account for the effects of the mixtures preparation stage.



中文翻译:

加工工艺对Ti(C,N)-Fe15Ni金属陶瓷性能的影响

这项研究旨在了解粉末制备和加工步骤对具有70%和80%(体积)陶瓷相的Ti(C,N)-Fe15Ni金属陶瓷的组织和性能的影响。粉末制备有两种方法:(i)胶体方法,包括制备粉末颗粒的稳定水悬浮液并喷雾干燥以获得易于压制的颗粒;(ii)常规粉末冶金方法,包括粉末的湿式球磨,随后在旋转蒸发仪中干燥。将所得粉末混合物单轴压制,并在1450°C的高真空下烧结2小时。烧结样品的特征在于其密度,孔隙率,微观结构(FESEM,图像分析),成分(EDX和XRD),通过大规模的纳米压痕和纳米划痕测试,获得小规模的硬度和滑动接触响应。对于常规途径,混合物粉末中的C含量较低,在研磨过程中会损失。烧结后,尽管加工路线和成分不同,但所有材料均显示出C降低,尽管对于传统粉末冶金路线而言,流出量较高,而对于粘合剂含量较高的组合物,流出量则更为明显。结果,COL样品在滑动接触条件下表现出更均匀的微观结构组装,更高的小规模硬度和机械完整性。然后必须相对于所采用的加工路线,将材料的组成调整至适当的初始C添加量,以说明混合物制备阶段的影响。对于常规途径,混合物粉末中的C含量较低,在研磨过程中会损失。烧结后,所有材料,尽管有加工路线和组成,都显示出C的降低,尽管对于传统粉末冶金路线而言,流出量更高,而对于粘合剂含量更高的组成则更为明显。结果,COL样品在滑动接触条件下表现出更均匀的微观结构组装,更高的小规模硬度和机械完整性。然后必须相对于所采用的加工路线,将材料的组成调整至适当的初始C添加量,以说明混合物制备阶段的影响。对于常规途径,混合物粉末中的C含量较低,在研磨过程中会损失。烧结后,尽管加工路线和成分不同,但所有材料均显示出C降低,尽管对于传统粉末冶金路线而言,流出量较高,而对于粘合剂含量较高的组合物,流出量则更为明显。结果,COL样品在滑动接触条件下表现出更均匀的微观结构组装,更高的小规模硬度和机械完整性。然后必须相对于所采用的加工路线,将材料的组成调整至适当的初始C添加量,以说明混合物制备阶段的影响。尽管对于传统的粉末冶金方法而言,流出量较高,而对于具有较高粘合剂含量的组合物,流出量则更为明显。结果,COL样品在滑动接触条件下表现出更均匀的微观结构组装,更高的小规模硬度和机械完整性。然后必须相对于所采用的加工路线,将材料的组成调整至适当的初始C添加量,以说明混合物制备阶段的影响。尽管对于传统的粉末冶金方法而言,流出量较高,而对于具有较高粘合剂含量的组合物,流出量则更为明显。结果,COL样品在滑动接触条件下表现出更均匀的微观结构组装,更高的小规模硬度和机械完整性。然后必须针对所采用的加工路线,将材料的成分调整为适当的初始C添加量,以说明混合物制备阶段的影响。

更新日期:2019-08-06
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