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ENVIRONMENTAL EFFECTS ON FRETTING WEAR

环境对微动磨损的影响

基本信息

批准号：
10045034
负责人：
IWABUCHI Akira
金额：
$ 3.01万
依托单位：
IWATE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

In this work, we examined the fretting wear properties of Zr-alloy under dry in air, in distilled water and in Na_2SO_4solution. Zr-alloy is used as fuel rods in the reactor of nuclear power plan. Furthermore, we examined the corrosive wear mechanism to understand the mechanism of fretting wear in corrosive environment. The critical slip amplitude of the fretting was 100 μm in air and in distilled water for the apparatus of Kyungpook University. As load increased, wear increased. But wear decreased with increasing load in distilled water, which was caused by the change in slip regime from gross slip to partial slip.In corrosive wear, which was examined using the reciprocating sliding wear apparatus, the parameters were solution concentration from lO^<-1> mol/l to 10^<-5> mo1/1, potential, load and anode area / cathode area ratio. As corrosive wear consisted of mechanical wear and electrochemical wear, mechanical wear was obtained in pure water. In the corrosive wear in Na_2SO_4 solution, the effect of concentration on wear volume appeared above 10^<-3> mol/l, and it increases with potential. The effects of load and area ration on wear and free potential drop were examined. The increase in load results in the increases in wear and potential drop. This is caused by the increase in fresh surface exposed. The contribution of electrochemical factor was obtained from the difference between total wear volume and wear volume in pure water. It was about 15 % in this case. The increase in potential meant that the electrochemical effect on wear (dissolution of metal) was reduced because of the decrease in anodic current density. Wear decrease with increasing the area ratio due to the increase in the potential drop.As the fretting wear has small wear scar, and the very low area ratio, the electrochemical contribution would increase.More investigation is needed for getting the data at high temperature and high ambient pressure like nuclear power reactor.

本文研究了锆合金在干燥空气、蒸馏水和Na_2SO_4溶液中的微动磨损性能。锆合金是核电站反应堆的燃料棒。此外，我们还研究了腐蚀磨损机理，以了解腐蚀环境中微动磨损的机理。京北大学的实验装置在空气和蒸馏水中微动的临界滑移幅度为100 μm。随着载荷的增加，磨损增加。用往复式滑动磨损试验机研究了在<-1>10 ~ 10 μ mol/l<-5>溶液中的腐蚀磨损，考察了溶液浓度、电位、载荷和阳极/阴极面积比对腐蚀磨损的影响。腐蚀磨损由机械磨损和电化学磨损组成，在纯水中表现为机械磨损。在Na_2SO_4溶液中的腐蚀磨损中，浓度对磨损体积的影响大于10 μ <-3>mol/l，且随电位的增大而增大。考察了载荷和面积比对磨损和自由电位降的影响。载荷的增加导致磨损和电位降的增加。这是由于新鲜表面暴露的增加造成的。根据总磨损体积与纯水中磨损体积之差计算了电化学因子的贡献。在这种情况下大约是15%。电位的增加意味着由于阳极电流密度的降低，对磨损（金属溶解）的电化学效应降低。随着面积比的增大，磨损量减小，这是由于电位降的增大，由于微动磨损的磨痕较小，且面积比很低，电化学贡献增大，因此需要进一步研究，以获得类似核反应堆的高温高压环境下的数据。