The high sintering temperature and machining cost are the two key obstacles to enlarge zirconia toughening ceramics as dental prosthetic. 氧化锆陶瓷的高烧结温度和高加工成本制约了其发展和进步,降低烧结温度和减少加工成本是近期关注的焦点。
After high temperature annealing the hardness of the composites did not reduced obviously until 973K, this temperature greatly exceeds that of pure copper ( after cold machining, the temperature is 423K). 本文制备的材料经高温退火后的硬度明显降低温度点为973K,大大超过了纯铜(冷加工态)的423K,而且热稳定性能较好。随着AIZO。
The limitation of traditional temperature sensor in high temperature measurement is introduced. A new nonmetal temperature sensor& graphite fibre thermoelectric couple is put forward, and the characteristic of sensor, machining manner, and application environment are presented. 介绍了高温测量中传统温度传感器的缺陷,提出了一种新型的非金属温度传感器&石墨纤维热电偶,并对该传感器的特性、加工方式、应用环境进行了分析。
It is pointed that high strain, high strain rate and high temperature are the main characteristics of high speed machining process. 指出高应变、高应变率和高温是高速切削不同于普通切削的特点。
Mirror die steel, as a kind of hard-to-cut material, has several problems, such as big cutting force, high machining temperature and work hardening in the process of machining. 镜面模具钢属于难加工材料,在加工过程中具有切削力大、切削温度高、加工硬化严重等问题。
Cutting heat and cutting temperature are the important research contents of high speed machining technology. The distribution and the change rule of the cutting temperature is one of the main basis of the process analysis in high speed machining. 切削热与切削温度是高速切削技术研究的重要内容,高速切削温度的分布及其变化规律是高速切削工艺分析的主要依据之一,具有重要的理论意义和应用价值。
In order to improve tensile strength under high temperature, weldability, corrosion resistance, machining easily and so on, the kind of large tubular parts should be processed under high temperature. 为了提高不锈钢管的高温拉伸强度、可焊接性、抗腐蚀性、易加工性等性能,一些大型的管状类零件都要经过高温固溶处理。
Aerostatic bearing has the merit of smooth operation, high precision, long life, pollution-free, small temperature rise etc. So it is widely used in the situation of high-speed and light loads, precision and ultra-precision machining and so on. 气体静压轴承具有运转平滑、精度高、寿命长、无污染、小温升等优点,从而广泛应用于高速、轻载、精密和超精密加工等场合。
High cutting temperature can not only reduce the tool life, but also influence machining accuracy because it can easily produce thermal deformation of workpiece and the machining process system and because it is able to surface integrity of the workpiece. 过高的切削温度不仅使刀具磨损快、寿命低;而且易使工件和加工工艺系统发生热变形,还会影响工件的表面完整性,从而影响加工精度。
Due to its high speed, high temperature resistance and high rigidity, angular contact ball bearing has received much attention and been widely used in high-speed machining field. 随着高速切削加工技术的发展,角接触球轴承因其转速高、耐高温和刚性好等特性而得到人们的高度重视和推广应用。