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In the study of microwave sintering of BaTiO〓 PTC ceramics, when the applied microwave power are above than a certain value, the abnormal axial shrinkage of the sintered sample will occur, by the analysis of SEM and XRD, it is found the microstructure and phase are different with conventionally sintered sample, the reason for this phenomenon is due to orientational grain growth by the action of electric field in the microwave sintering process.

微波烧结BaTiO〓电子陶瓷时,当所加的微波功率超过一定值时,首次发现烧结样品出现轴向异常收缩现象,采用SEM、XRD等分析发现其微观结构与常规烧结有巨大的差异,这是BaTiO〓材料的晶粒在微波场中受电场力作用而发生的取向生长造成的。

In this investigation, the compression behavior of COx argillite with two different grain size distributions, which were obtained by two different crush procedures, was studied by running 1D compression tests with several loading-unloading cycles.

通过开展一维压缩试验,研究2种不同粉碎工艺下获得的粗/细COx土样的压缩特性,结果表明:压缩曲线受粒度成分的影响非常明显,为获得同等压实度,细粒土所需的压实功能较粗粒土高,除此之外,细粒土的压缩指数也高于粗粒土,表现出较强的压缩性;随着土样压实密度的增加,粗/细土样的压缩曲线逐渐靠拢,粒度成分对压实功能影响逐渐减弱;土样卸荷时回弹指数随干密度的增加而增加,受粒度成分的影响不明显;高压实ρ(下标 d=2.0g/立方公分粗粒土样在7 MPa的轴向应力下饱和时,体积发生明显的塌陷现象,饱和后土样的压缩指数小于饱和前,而回弹指数则较饱和前高。

The results show that La can refine the microstructure of Zn-22%Al alloy, slow down the grain growth and reduce the equiaxial degree during ageing, that the strength of Zn-22%Al-alloys and Zn-22%Al alloy remains constant after ageing below the warm-rolling temperature, and that La can improve the strength and the stability of mechanical properties of Zn-22%Al alloy.

结果表明:La具有细化Zn-22%Al合金的组织并阻碍时效时晶粒长大和等轴程度降低的作用;在低于温轧温度(80 ℃)下时效时,加La和不加La的Zn-22%Al合金的室温力学性能保持不变; La可提高Zn-22%Al合金的强度以及时效时力学性能的稳定性。

Based on some principal rules of brittle rocks polyaxial tests and previous researches, three controlling failure types for brittle rock are obtained. The first type represents the brittle failure controlled by extension microcrack under the condition of lower hydrostatic pressure; the second represents the ductile failure controlled by friction sliding action under the condition of higher hydrostatic pressure when microcrack is close; and the third represents brittle-ductile failure type controlled by multiple factors mentioned above under the condition of high hydrostatic pressure when some microcracks are open and others are close.

通过分析脆性岩石多轴试验中的强度和破坏规律,在已有研究成果基础上,将其强度和破坏控制类型主要归结为3种:类型1,低静水压力时裂缝张开扩展,主要表现为张性微裂缝控制型脆性破坏;类型2,静水压力很高时,裂缝闭合,主要表现为摩擦滑移控制型延性破坏;类型3,处于两者之间时,微裂缝一部分张开,一部分闭合,主要表现为两者复合控制型脆延破坏。

And the extreme centrifugal force from the enlarged higher impeller stops the solution as it entering the higher impellr. At the same time, the full solution in the chamber stops the air mixed with the solution in the chamber to go down. This way masterly eliminates both big problems of vertical sealless pump, overflow at high pressure and bubbles at big flow.

上部叶轮时,即受加大之背叶的强大阻力而无法上升,但上部叶轮所卷入液体中的空气,却受阻於水室中贮满的液体而无法下降,如此巧妙地排除了立式无轴封泵高压时溢流,或大流量时吸入空气的两大难题。

Low pulse before sift network operating principles : the use of double - sieve drum aircraft design; Work, pulp before sift upper tangent pressure the network into; Pulp the filter into the upper body of the dle two filter drum, double tilt-rotor rotary rotors, while the centrifugal force and centripetal forces role, through good mix inside and outside pool in sieve sieve drum body low extremity good mix of outflow; pulse in the tilt-rotor rotary drum filter

低脉冲网前筛工作原理:该机采用双筛鼓设计;工作时,浆料从网前筛上部切线压力送入;浆料从筛体上部流入到两个筛鼓中间,在双旋翼转子旋转时产生的离心力和向心力的同时作用下,良浆通过内、外筛鼓汇集于筛体下端的良浆管流出;脉冲旋翼在旋转时筛鼓不会赌赛,浆渣受转子旋转产生的轴向推动力,向下流送的同时被浓缩并逐步移到排渣口。

Low pulse before sift network operating principles : the use of double - sieve drum aircraft design; Work, pulp before sift upper tangent pressure from the network into; Pulp from the filter into the upper body of the middle two filter drum, double tilt-rotor rotary rotors, while the centrifugal force and centripetal forces role, through good mix inside and outside pool in sieve sieve drum body low extremity good mix of outflow; pulse in the tilt-rotor rotary drum filter

低脉冲网前筛工作原理:该机采用双筛鼓设计;工作时,浆料从网前筛上部切线压力送入;浆料从筛体上部流入到两个筛鼓中间,在双旋翼转子旋转时产生的离心力和向心力的同时作用下,良浆通过内、外筛鼓汇集于筛体下端的良浆管流出;脉冲旋翼在旋转时筛鼓不会赌赛,浆渣受转子旋转产生的轴向推动力,向下流送的同时被浓缩并逐步移到排渣口。

As a downstream piping system when the valve opens, reflux valve, when closed, the main medium used to prevent backflow to prevent the pump and drive motor reversal, as well as a container medium discharge; currently the most commonly used is the valve flap around the body Swing Pin rotation flap valve and the valve body along the vertical axis to move lift check valve, but the above two kinds of structures exist in the valve closed, medium speed back quickly from the largest drop to zero, inlet side of the pipe resulted in the rapid pressure rise, resulting Proportional Pressure Reducing Valves in damaging effects on the piping system of water hammer phenomenon, it is generally a diameter of valve production of 50 ~ 500 mm.

止回阀作为管道系统顺流时开启,逆流时关闭的阀门,主要用于防止介质倒流,防止泵及驱动电机反转以及容器内介质泄放;目前使用最普遍的是阀瓣围绕阀体销轴旋转的旋启式止回阀和阀瓣沿着阀体垂直中心线移动的升降式止回阀,但以上2种结构的阀门均存在关闭时介质倒流速度从最大迅速降为零,致使管道进水管一侧内压迅速升高,从而产生对管路系统有破坏作用的水锤现象,所以一般止回阀生产口径为50~500 mm。

The results are as follows: The start recrystallization temperature of Mo-C is about 950℃ and the process is finished around 1200℃, and during this process, the transverse bending property is gradually improved and the elongation percent of the transverse bending reached max value (about 5%) at 1100-1200℃.

研究结果表明:Mo-C棒再结晶开始温度在950℃左右,在1200℃时基本形成了等轴晶组织;当退火温度低于1200℃时,随着退火温度的升高,合金的横向弯曲性能逐渐提高,在1100~1200℃时,合金的横向弯曲延伸率最高,达到5%。

Leakage in the initial observation to determine the basis of the leakage site, and then manually set car observation, if the leakage were no significant changes in static and dynamic sealing ring problem; such as the disk when there are significant changes in leakage can be concluded that the dynamic , static friction ring problems; such as leakage of medium along the jet axis, w你好le moving most of Central ring problems, leakage to the surrounding medium or from the water spray cooling holes in the leakage, the seal ring for static failure.

杂质泵安装静试时泄漏机械弥缝安装调试好后,一般要进行静试,察看泄漏量如泄漏量较小,多为动环或静环弥缝圈存在问题;泄漏量较大时,则表白动、静环磨擦副间存在问题在开端察看泄漏量、判断泄漏部位的根蒂根基上,再手动盘车察看,若泄漏量无明显变化则静、动环弥缝圈有问题;如盘车时泄漏量有明显变化则可下定论是动、静环磨擦副存在问题;如泄漏介质沿轴向喷洒,则动环弥缝圈存在问题居多,泄漏介质向四周喷洒或从水冷却孔中漏出,则多为静环弥缝圈失效此外,泄漏通道也可同时存在,但一般有主次区分,只要察看细致,认识结构,一定能正确判断

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