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首页> 外文期刊>Thin Solid Films >Growth kinetics and some mechanical properties of two-phase boride layers produced on commercially pure titanium during plasma paste boriding
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Growth kinetics and some mechanical properties of two-phase boride layers produced on commercially pure titanium during plasma paste boriding

机译：工业纯钛在浆糊硼化过程中产生的两相硼化物层的生长动力学和某些力学性能

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In this study, the plasma paste boriding (PPB) was applied in order to produce the boride layers on commercially pure titanium (Cp-Ti). PPB process was carried out in 50% H2-50% Ar atmosphere under a reduced pressure at various parameters (temperature and duration). The boride layers consisted of two zones: a continuous TiB2 zone close to the surface and a zone with TiB whiskers below the first one. The growth of both zones obeyed the parabolic, growth law. The model of growth kinetics of such layers was analyzed. The parabolic growth constants were calculated and the boron diffusion coefficients were determined. Activation energy values of 123.33 and 178.71 kJ mol(-1) were obtained for TiB2 and TiB phases, respectively. The calculated value for TiB2 phase was lower compared to the other boriding processes. Microhardness profile was determined for the layer of the highest depth. The maximal microhardness was characteristic of TiB2 zone (2452 HV). Nanomechanical properties (nanohardness and Young's modulus) were studied using the nanoindenter. TiB2 zone was characterized by the nanohardness of 2867.6 HV and indentation modulus E-IT= 383 GPa. Wear resistance of plasma paste borided layers was up to 9 times higher when comparing to the untreated Cp-Ti. (C) 2017 Elsevier B.V. All rights reserved.
机译：在这项研究中，应用等离子体糊化硼化物（PPB）来在商业纯钛（Cp-Ti）上生产硼化物层。 PPB工艺在50％H2-50％Ar气氛中，在各种参数（温度和持续时间）下，减压下进行。硼化物层由两个区组成：靠近表面的连续TiB2区和在第一个区以下的TiB晶须区。两个区域的增长都遵循抛物线的增长规律。分析了此类层的生长动力学模型。计算抛物线的生长常数，并确定硼的扩散系数。 TiB2和TiB相的活化能分别为123.33和178.71 kJ mol（-1）。与其他硼化工艺相比，TiB2相的计算值更低。确定了最高深度层的显微硬度分布。最大显微硬度是TiB2区（2452 HV）的特征。使用纳米压头研究了纳米力学性能（纳米硬度和杨氏模量）。 TiB2区的特征是纳米硬度为2867.6 HV，压痕模量E-IT = 383 GPa。与未经处理的Cp-Ti相比，等离子体糊化硼化层的耐磨性高9倍。 （C）2017 Elsevier B.V.保留所有权利。

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