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Article
Publication date: 6 May 2024

Ting Li, Junmiao Wu, Junhai Wang, Yunwu Yu, Xinran Li, Xiaoyi Wei and Lixiu Zhang

The purpose of this article is to prepare graphene/polyimide composite materials for use as bearing cage materials, improving the friction and wear performance of bearing cages.

Abstract

Purpose

The purpose of this article is to prepare graphene/polyimide composite materials for use as bearing cage materials, improving the friction and wear performance of bearing cages.

Design/methodology/approach

The oil absorption and discharge tests were conducted to evaluate the oil content properties of the materials, while the mechanical properties were analyzed through cross-sectional morphology examination. Investigation into the tribological behavior and wear mechanisms encompassed characterization and analysis of wear trace morphology in PPI-based materials. Consequently, the influence of varied graphene nanoplatelets (GN) concentrations on the oil content, mechanical and tribological properties of PPI-based materials was elucidated.

Findings

The composites exhibit excellent oil-containing properties due to the increased porosity of PPI-GN composites. The robust formation of covalent bonds between GN and PPI amplifies the adhesive potency of the PPI-GN composites, thereby inducing a substantial enhancement in impact strength. Notably, the PPI-GN composites showed enhanced lubrication properties compared to PPI, which was particularly evident at a GN content of 0.5 Wt.%, as evidenced by the minimization of the average coefficient of friction and the width of the abrasion marks.

Practical implications

This paper includes implications for elucidating the wear mechanism of the polyimide composites under frictional wear conditions and then to guide the optimization of oil content and tribological properties of polyimide bearing cage materials.

Originality/value

In this paper, homogeneously dispersed PPI-GN composites were effectively synthesized by introducing GN into a polyimide matrix through in situ polymerization, and the lubrication mechanism of the PPI composites was compared with that of the PPI-GN composites to illustrate the composites’ superiority.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2023-0415

Details

Industrial Lubrication and Tribology, vol. 76 no. 4
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 4 August 2022

Guanghui Qiao, Yating Cao and Junmiao Zhang

The physiological and psychological issues that limit people with vision impairment make it difficult for them to participate in tourism activities and enjoy the various benefits…

1178

Abstract

Purpose

The physiological and psychological issues that limit people with vision impairment make it difficult for them to participate in tourism activities and enjoy the various benefits of tourism. This study aims to construct a theoretical model of the tourism-influencing factors that can lead to problems for people with vision impairment to meet their travel desires and improve their enjoyment of life.

Design/methodology/approach

This study adopted a mixed-methods approach. A theoretical model of the tourism-influencing factors for people with vision impairment was constructed based on grounded theoretical analysis of interviews and was then tested in a quantitative survey.

Findings

In the first stage, a new theoretical model of the tourism-influencing factors for people with vision impairment was conducted. In the second stage, five research hypotheses arising from the theoretical model were tested in a quantitative survey. The results show that internal psychological perception, perceived behavioural control and perceived social intention have a significant positive impact on the tourism intention behaviour of people with vision impairment. However, subjective norms do not significantly influence the tourism behaviour intention of people with vision impairment.

Originality/value

The right to tourism should be available to disabled as well as to able-bodied people. Few tourism research studies have focused on people with vision impairment, and the influencing factors on the behaviour of people with vision impairment have not received due attention. This study extends the theoretical model of the theory of planned behaviour and provides a new perspective for understanding the travel behaviour intention of people with vision impairment.

目的

视障者受生理和心理问题的限制, 较难参与旅游活动并享受旅游带来的各种好处。本研究旨在构建出视障者旅游行为影响因素理论模型, 以满足视障群体的旅游需求, 并提高他们的生活幸福感。

设计/方法/途径

本研究采用混合研究方法。以访谈为基础进行扎根理论分析, 构建出视障者旅游行为影响因素的理论模型, 并通过定量研究验证模型。

发现

第一阶段, 构建了视障者旅游行为影响因素的新理论模型。第二阶段, 根据构建出的理论模型提出五个研究假设, 并通过定量研究进行验证。研究结果显示内在心理感知、知觉行为控制和社会支持感知对视障者旅游行为意向存在显著正向影响, 而主观规范对视障者旅游行为意向的影响不显著。

独创性

视障者同健全者拥有平等的旅游权利。但旅游研究中针对视障群体的研究很少, 对视障者旅游行为影响因素的研究更未得到应有的重视。本研究拓展了计划行为理论模型, 为理解视障者旅游行为意向提供了新的视角。

Objetivo

La limitación de los problemas físicos y psicológicos de las personas con discapacidad visual, dificulta su participación en actividades turísticas y el disfrute de los beneficios del turismo. El objetivo de este estudio es construir un modelo teórico de los factores que influyen en el turismo y que puedan causar problemas a las personas con discapacidad visual para satisfacer sus deseos turísticos y mejorar su disfrute de la vida.

Diseño/metodología/enfoque

En este estudio se utilizó un método mixto. Sobre la base del análisis de la teoría de la raíz de la entrevista, se construye el modelo teórico de los factores que influyen en el turismo de las personas con discapacidad visual.

Conclusiones

En la primera etapa, se establece un nuevo modelo teórico sobre los factores que influyen en el turismo de las personas con discapacidad visual. En la segunda etapa, se investigan cuantitativamente las cinco hipótesis de investigación presentadas por el modelo teórico. Los resultados mostraron que la percepción psicológica interna, el control del comportamiento percibido y la intención social percibida tenían un efecto positivo significativo en el comportamiento de la intención turística de los pacientes con discapacidad visual. Sin embargo, las normas subjetivas no tienen un efecto significativo en la intención de comportamiento turístico de las personas con discapacidad visual.

Originalidad

Las personas con discapacidad y las personas sanas tienen derecho al turismo. Pocas investigaciones turísticas se centran en las personas con discapacidad visual, y no se presta la debida atención a los factores que influyen en el comportamiento de las personas con discapacidad visual. Este estudio amplió el modelo teórico de la teoría del comportamiento planificado y proporcionó una nueva perspectiva para entender la intención de comportamiento de viaje de las personas con discapacidad visual.

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