目的 提高H13热作模具钢表面的显微硬度及耐磨性。方法 通过多弧离子镀技术,分别对未经热处理的H13钢、淬火H13钢以及氮化H13钢的表面进行多弧离子镀沉积Cr Al N涂层,并分别对这3种基体上的Cr Al N涂层的显微硬度和摩擦磨损性能进行研...目的 提高H13热作模具钢表面的显微硬度及耐磨性。方法 通过多弧离子镀技术,分别对未经热处理的H13钢、淬火H13钢以及氮化H13钢的表面进行多弧离子镀沉积Cr Al N涂层,并分别对这3种基体上的Cr Al N涂层的显微硬度和摩擦磨损性能进行研究。结果 涂层表面均较为平整,且出现了白色小颗粒。经过淬火和氮化处理后,H13钢Cr Al N涂层的显微硬度达到3 300HV以上,达到基体的14倍多。与基体的摩擦系数相比,淬火和氮化处理后,H13钢的摩擦系数比基体低,镀膜后的摩擦系数比基体高。氮化H13钢表面Cr Al N涂层的磨损机理主要是磨粒磨损和黏着磨损共同作用,淬火H13钢的Cr Al N涂层磨损机理主要是黏着磨损;淬火和氮化后H13钢基体上CrAlN涂层的耐磨性均得到较大的提高。展开更多
Using thelast 5 years' (1983—1988) global Satellite Laser Ranging (SLR) data of satellite Lageos, we have determined the present-day change rate of the baseline length among those SLR stations located in the Nort...Using thelast 5 years' (1983—1988) global Satellite Laser Ranging (SLR) data of satellite Lageos, we have determined the present-day change rate of the baseline length among those SLR stations located in the North America, South America, Indaia, Pacific and Eurasia plates. The precision estimated is better than 1 cm/a. The results of this determination agree with those obtained by the geologic tectonic rate model of Minster and Jordan (1978). This indicates that the motion of those regions located faraway from the plate boundary is probably stable in the past million years. In some regions at the plate boundary the result is found disagreed with the M/J model. For example, the determined change rate of the Monumeny Peak-Ouincy baseline across the famous San-Andreas transform fault is 2.9cm/a (M/J:5.3 cm/a). This might be explained with the hypothesis that periodic deformations occurring at the plate boundary and sudden deformations occurring only in the plate boundary zone. We have also found the intraplate motion at the rate 1 cm/a between the east and the west in the North America plate.A brief introduction is also given to the principle and the estimation method called 'multistage-multiarc' for determining the plate motion by the SLR technique along with an analysis of error sources in determinations.展开更多
文摘目的 提高H13热作模具钢表面的显微硬度及耐磨性。方法 通过多弧离子镀技术,分别对未经热处理的H13钢、淬火H13钢以及氮化H13钢的表面进行多弧离子镀沉积Cr Al N涂层,并分别对这3种基体上的Cr Al N涂层的显微硬度和摩擦磨损性能进行研究。结果 涂层表面均较为平整,且出现了白色小颗粒。经过淬火和氮化处理后,H13钢Cr Al N涂层的显微硬度达到3 300HV以上,达到基体的14倍多。与基体的摩擦系数相比,淬火和氮化处理后,H13钢的摩擦系数比基体低,镀膜后的摩擦系数比基体高。氮化H13钢表面Cr Al N涂层的磨损机理主要是磨粒磨损和黏着磨损共同作用,淬火H13钢的Cr Al N涂层磨损机理主要是黏着磨损;淬火和氮化后H13钢基体上CrAlN涂层的耐磨性均得到较大的提高。
文摘Using thelast 5 years' (1983—1988) global Satellite Laser Ranging (SLR) data of satellite Lageos, we have determined the present-day change rate of the baseline length among those SLR stations located in the North America, South America, Indaia, Pacific and Eurasia plates. The precision estimated is better than 1 cm/a. The results of this determination agree with those obtained by the geologic tectonic rate model of Minster and Jordan (1978). This indicates that the motion of those regions located faraway from the plate boundary is probably stable in the past million years. In some regions at the plate boundary the result is found disagreed with the M/J model. For example, the determined change rate of the Monumeny Peak-Ouincy baseline across the famous San-Andreas transform fault is 2.9cm/a (M/J:5.3 cm/a). This might be explained with the hypothesis that periodic deformations occurring at the plate boundary and sudden deformations occurring only in the plate boundary zone. We have also found the intraplate motion at the rate 1 cm/a between the east and the west in the North America plate.A brief introduction is also given to the principle and the estimation method called 'multistage-multiarc' for determining the plate motion by the SLR technique along with an analysis of error sources in determinations.
