2017年12月8日星期五

Types of Molybdenum Alloy


Molybdenum alloy is a nonferrous alloy consisting of other elements with molybdenum as the matrix. Types of molybdenum alloy include TZM and TZC alloys, MHC and ZHM alloys, molybdenum-tungsten alloy, molybdenum-rhenium alloy, MH and KW alloys.

TZM and TZC Alloys

TZM is an acronym for titanium-zirconium-molybdenum, and is typically manufactured by powder metallurgy or arc-casting processes. It is an alloy that has a higher recrystallization temperature, higher creep strength, and higher tensile strength than pure, unalloyed molybdenum. Available in rod and plate form, it is often used for hardware in vacuum furnaces, large x-ray equipment, and in creating tools. TZC alloy is using powder metallurgy and vacuum arc melting method of preparation. It may make space rockets flying devices and surface components, etc.

MHC and ZHM Alloys

MHC alloy is a particle-reinforced molybdenum alloy which contains hafnium and carbon. The carbon is uniformly distributed along the alloys structure giving it excellent heat and creep resistant properties at elevated temperatures of 1550°C (2822°F). This alloy is able to function under extreme mechanical and thermal loads. ZHM alloy, mass percentage of each component is zirconium 0.4 to 0.7, 1.2 to 2.1 hafnium, 0.15 to 0.27 carbon. Both TZM and MHC have found application as metalworking tool materials. 

Molybdenum-tungsten Alloy

Molybdenum tungsten alloy has better corrosion resistance, making it better able to resist molten zinc. Molybdenum has a high melting point and high density, so tungsten-molybdenum alloy also has these characteristics. Molybdenum and tungsten alloy can have a different proportion of tungsten, such as 30% tungsten or 50% of tungsten.

Molybdenum-rhenium Alloy

Molybdenum-rhenium is a highly pure alloy containing only two elements (molybdenum and rhenium), and serves a wide range of applications in electronics, furnace, joining, and aerospace industries. Precise alloying of the refractory metals rhenium and molybdenum adds both ductility and strength to suit different specifications. It is a superconductive alloy with a noble surface chemistry and a relatively high transition temperature.

MH and KW Alloy

MH alloy adds potassium and sulfur elements with molybdenum as the matrix; KW alloy is a molybdenum alloy with potassium, silicon and other elements added in the molybdenum matrix.

If you have any inquires concerning molybdenum products, please don't hesitate to e-mail us by : sales@chinatungsten.com or info@chinatungsten.com

2017年12月5日星期二

Molybdenum Copper Alloy Properties

Molybdenum copper is alloy of molybdenum and copper. It is a great alternative to tungsten copper for weight sensitive applications, with many good properties.

1. High electrical and thermal conductivity. Molybdenum is a better element for electricity conductivity except for gold, silver and copper in the metals. Therefore, molybdenum copper alloy composed by molybdenum and copper have very high electrical and thermal conductivity.

2. Adjustable low coefficient of thermal expansion. The coefficient of thermal expansion of copper is higher, but the coefficient of thermal expansion of molybdenum is very low. Therefore, the low coefficient of thermal expansion can be made by different proportion of the components according to the requirements, in order to make them appropriate and combine with other materials, avoid the damage of thermal stress caused by large differences in coefficient thermal expansions.

3. Special high temperature property. The melting point of molybdenum is 2 610, and the melting point of copper is only 1083, molybdenum-copper alloy have good strength property and definite plasticity in ordinary temperature. And if the temperature exceeds the melting point of copper, the copper will change to liquid and evaporate to absorb heat, to make cooling effect. This performance can be used as special-purpose high-temperature materials, such as the nozzle throat which can be resist combustion temperature of gunpowder, electrical contact which under high-temperature electric arc, and so on.

4. Molybdenum copper alloy is non-magnetic. Both molybdenum and copper are non-magnetic non-ferrous metals. Hence the composition of Mo-Cu alloy is an excellent non-magnetic material.

5. Molybdenum copper alloy has low gas content and a good vacuum performance. Either molybdenum or copper, its oxides easy to restore, their N, H, C and other impurities can easily be removed, thereby maintaining low outgassing and makes full use of performance of the vacuum.

6. Molybdenum copper alloy has good machinability. Because of high hardness and brittleness, it is difficult to machine the pure molybdenum. Mo-Cu alloy, because of copper's incorporation, the hardness reduced and plasticity increases, so it is beneficial to machining, and can be processed into complex shapes components.

If you have any inquires concerning molybdenum products, please don't hesitate to e-mail us by : sales@chinatungsten.com or info@chinatungsten.com

2017年11月27日星期一

Customized Molybdenum Metals from Chinatungsten

With more than two decades experiences, Chinatungsten Online has improved his technology and processing skills on deep processing molybdenum metals. Customized moly parts suitable for the final application has been popular accepted. Drawings or standards are provided before quoting. If any design is carried out and for a price estimation, surely, ask for Chinatungsten a quote. Any question to be solved, ask for Chinatungsten an idea. Any issues after buying the parts, ask for Chinatungsten a solution. We serve customized molybdenum metals, also service from the inquiry to the usage.

Molybdenum metal processed with thread and center hole

molybdenum metal picture

Molybdenum metal processed with thread, round tip and center hole.

molybdenum metal picture

Molybdenum hanger processed with thread.

molybdenum metal picture

Hex molybdenum nut

molybdenum metal picture

Molybdenum thread rod

molybdenum metal picture

Molybdenum rod with round tip

molybdenum metal picture

Molybdenum rod with thread end

molybdenum metal picture

Molybdenum ring customized with holes

molybdenum metal picture

Molybdenum crucible with lid

molybdenum metal picture

If you have any inquires concerning molybdenum products, please don't hesitate to e-mail us by : sales@chinatungsten.com or info@chinatungsten.com

Applications of Tungsten Bucking Bar

Bucking bar is a work tool received behind work surfaces to provide a backing member in applying impact fasteners and including intermitted toolhead and handle parts with a low-recoil impact-absorbing spacer provided there between to take shock loads in compression and shear.

Tungsten bucking bars are used on the backside of a metal rivet to counter the force of the hammering on the other side. They also can be used to absorb the force of rivet guns, reducing the vibration of bucking.

tungsten bucking bar picture

Tungsten bucking bars used to form bucktails on rivets. And come in many different shapes and sizes. They are normally made from an alloy steel similar to tool steel. The particular shape to be used depends upon the location and accessibility of the rivet to be driven.

The size and weight of the bar depend on the size and alloy of the rivet to be driven. Under certain circumstances, and for specific rivet installations, specially designed bucking bars are manufactured locally.

tungsten bucking bar picture

At Chinatungsten Online,  tungsten bucking bars are normally made from tungsten heavy alloy. All edges are deburred and working surfaces are polished for troubles-free use. This helps to prevent marring of formed bucktails. Please notice that never hold a bucking bar in a vise unless the vise jaws are equipped with protective covers to prevent marring of the bucking bar.

If you have any inquires concerning molybdenum products, please don't hesitate to e-mail us by : sales@chinatungsten.com or info@chinatungsten.com

2017年11月21日星期二

Working Principle of Tungsten Bucking Bar

The tungsten bucking bar may be secured in a bench vice and, with the components positioned by hand; rivets are set with a gun held in the other hand.  The main advantage here is that the bar is stationary and the components may be more easily held and positioned for riveting.

tungsten bucking bar picture

Tungsten Bucking bar orientation

Rest tungsten bucking bar on inserted rivet and try to locate its point of balance.

With gun set in place, use tungsten bucking bar to push rivet (and gun assembly) outward. Tungsten bucking bar will then register at right angles to the rivet as it comes to rest on the aluminum.

Push rivet back into place with gun set and reposition bucking bar, if necessary, to maintain its point of balance on the rivet. (repeat steps 2and 3until point of balance is determined). Often the index finger can be placed on the back of the bucking bar directly opposite the rivet tail. It then becomes the ‘sensor’ for correct bar position.

tungsten bucking bar picture

Pressure is held on gun while riveting. Bucking bar is held with only moderate force (otherwise rivet may be set with head proud of surface). A rubber grommet may be used over the rivet tail to assist in squeezing parts together during riveting. It acts as a 'pressure plate' .

Duration of riveting is determined by experimentation with a test piece or previous.

If you have any inquires concerning molybdenum products, please don't hesitate to e-mail us by : sales@chinatungsten.com or info@chinatungsten.com

2017年11月20日星期一

What Is Tungsten Bucking Bar

Tungsten bucking bar is a work tool received behind work surfaces to provide a backing member in applying impact fasteners and including intermitted toolhead and handle parts with a low-recoil impact-absorbing spacer provided there between to take shock loads in compression and shear.

tungsten bucking bar picture
Tungsten bucking bars are used on the backside of a metal rivet to counter the force of the hammering on the other side. They also can be used to absorb the force of rivet guns, reducing the vibration of bucking.

Tungsten bucking bars used to form bucktails on rivets. And come in many different shapes and sizes. They are normally made from an alloy steel similar to tool steel. The particular shape to be used depends upon the location and accessibility of the rivet to be driven.

The size and weight of the bar depend on the size and alloy of the rivet to be driven. Under certain circumstances, and for specific rivet installations, specially designed bucking bars are manufactured locally.

At Chinatungsten Online, bucking bars are normally made from tungsten heavy alloy. All edHges are deburred and working surfaces are polished for troubles-free use. This helps to prevent marring of formed bucktails. Please notice that never hold a bucking bar in a vise unless the vise jaws are equipped with protective covers to prevent marring of the bucking bar.

If you have any inquires concerning molybdenum products, please don't hesitate to e-mail us by : sales@chinatungsten.com or info@chinatungsten.com

2017年11月15日星期三

La Doping Methods Affected La-TZM Alloy’s Properties

Doped with a certain amount of La2O3 during powder metallurgy process can obtain La-TZM alloy which has higher strength than TZM alloy. Different la doping methods have different effect on La-TZM alloy. Separately doped lanthanum by solid-solid doping method and solid-liquid doping  method, then after sintering, hot rolling, warm rolling, cold rolling and other processing procedures to obtain La-TZM alloy. Using solid-solid alloy doping method obtained alloy were labeled as 1# and solid - liquid were labeled as 2#.

Observed La-TZM alloy powder morphology and particle size distribution found that 2 # doping is more uniform more than 1# and there exists a local reunion
TZM sheets picture
phenomenon in 1#, form this we can see solid-liquid can obtain uniformly mixed material. After mechanical properties tensile testing found that La-TZM alloy tensile property is better than TZM alloy. Besides, 2# tensile property is superior to 1#, increased 10.9%. From this we will know solid-liquid is more conducive to improving the mechanical properties of the alloy. Analyzed La-TZM alloy SEM micrographs found the second phase in alloy not only distributes in the grain boundary, also distributes in the grain. And the average grain size of 2 # is less than 1 #. It is mainly because the powder which obtained by solid-liquid method is finer than solid-solid method and the finer powder, the smaller grain size is after sintering. In addition, there are a series of reactions of La2 (NO3) 3 at the beginning of sintering, so La2O3 mix more evenly. (La2 (NO3) 3 • 6H2O → La (NO3) 3 • 5H2O → La (NO3) 3 • 3H2O → La (NO3) 3 → LaONO3 → La2O3 • LaONO3 → La2O3).

The fracture morphology of solid-solid doped alloy plate and solid-liquid doped alloy plate is similar, but solid - liquid doped alloy plate fracture will be more careful and distributes fine and uniform second phase. The second phase is mainly distributed in the grain boundary and it can hinder the propagation of intergranular crack. Besides it has smaller crack and cleavage plane and it mainly shows intergranular fracture characteristics. Solid-liquid doping method second phase distribution is uniformly, and solid-solid doping method second phase has stratification phenomenon, so using solid-liquid can produce high quality and good properties alloy.

If you have any inquires concerning molybdenum products, please don't hesitate to e-mail us by : sales@chinatungsten.com or info@chinatungsten.com