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China Heat Treatment and Surface Modification Technology Roadmap (II)

China Heat Treatment and Surface Modification Technology Roadmap (II)

Key components are to determine the main function of mechanical equipment, reflecting the life and reliability of mechanical equipment, failure breeds catastrophic consequences, the main failure components are fatigue of the main bearing components. Key components have three categories: ① rotating components, such as blades, wheels, shafts; ② transmission components, such as gears, bearings; ③ main bearing components, such as aircraft landing gear, docking bolts, bearing joints, bearing springs, etc.. One of the common characteristics of key components is: dynamic! They are in service under dynamic, subject to dynamic load resulting in their fatigue failure. The second common characteristic is: extreme environment! Because critical members are designed for light weight, small size, long life, and

Jun 07,2016

Three details to note in vacuum heat treatment of experimental vacuum furnace

Three details to note in vacuum heat treatment of experimental vacuum furnace

The vacuum tempering furnace should have a quick cooling device. The pressure of cooling water should be greater than 0.2Mpa, the flow rate should be adjustable. Heating up: after putting in the workpiece, generally pre-pumping to 6.67Pa before heating up the heating process, the workpiece and the furnace material will be deflated, so that the vacuum level drops. Cooling gas: generally use 99.995% purity of nitrogen, high temperature alloys using 99.999% nitrogen or argon, titanium alloys using 99.995% argon. Vacuum furnace active connection part all use O-ring sealing connection, this part are through water cooling. Vacuum annealing, vacuum annealing, vacuum solution treatment and vacuum aging heating temperature is generally the same as the heating temperature of conventional treatment. Workpiece quenching under vacuum, should use vacuum quenching oil, this oil has a low saturated vapor pressure. Vacuum furnace maintenance should be in a vacuum or pure nitrogen state, to avoid the usual use of air absorption, moisture absorption. Domestic vacuum furnace pressure rise rate should not be greater than 1.33 Pa / h, the standard of some foreign companies for 0.67 Pa / h vacuum furnace treatment of titanium alloys, should not use nitrogen as a cooling gas, because titanium and nitrogen at high temperature reaction, the formation of golden yellow titanium nitride. The vacuum heating is based on radiation, and the workpiece should be kept spaced in the furnace.

Jun 06,2016

Vacuum furnace research and development should be the top priority of environmental protection and energy saving

Vacuum furnace research and development should be the top priority of environmental protection and energy saving

The vacuum electric furnace and industrial furnace industry production and operation development momentum is good, get sustained development. Enterprise restructuring basically entered the late stage, the existing joint-stock system, private individual enterprises have accounted for more than 98% of the industry. For the development characteristics of the industry, the club actively work, so that the industry product level price development, the exchange of scientific and technological information, technical cooperation and communication between domestic and foreign enterprises, as well as with the National Industrial Electric Heating Equipment Standard Committee to work together to develop and revise a number of international standards and national standards and other work, have made good achievements and progress.

Jun 01,2016

China Heat Treatment and Surface Modification Technology Roadmap (III)

China Heat Treatment and Surface Modification Technology Roadmap (III)

Heat treatment" is a technology that uses heating and cooling methods to control phase changes, microstructure, and residual stress fields to give the ultimate performance of the material and the ultimate service performance of key components. It seems to be a relatively simple method, but it is both a very theoretical science and a very practical technology.

May 31,2016

Vacuum Acquisition Technology

Vacuum Acquisition Technology

It is common to refer to the equipment that can expel gas from a closed container or make the number of gas molecules in the container decrease continuously as vacuum obtaining equipment or vacuum pump. At present in vacuum technology, using different methods, it has been possible to obtain and measure a pressure range from 105 Pa to 10-13 Pa at atmospheric pressure, up to 18 orders of magnitude wide. Obviously, it is very difficult to obtain such a wide range of gas states in low pressure space using only one vacuum pump. In vacuum acquisition technology, there are two technical methods used to obtain vacuum, one is to discharge the gas directly from the closed container by the movement of a certain mechanism; the other one is to discharge the gas directly from the closed container.

May 25,2016

China Heat Treatment and Surface Modification Technology Roadmap (I)

China Heat Treatment and Surface Modification Technology Roadmap (I)

Heat treatment and surface modification to give advanced materials limit performance and key components limit service performance, belongs to the national core technology, it has a pivotal role in the process of China from a large materials and machinery manufacturing power to a strong country. Therefore, it is of strategic importance to raise awareness and devote national efforts to prioritize the development of heat treatment and surface modification technology to change the backward situation.

May 23,2016

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