How to Evaluate Molybdenum Disulfide Grease’s Carrying Capacity?

With the continuous development of technology, the working conditions of many products have become more and more complex, and the environment has become more and more demanding. For example, some products need to be used in a high load or impact load environment, which requires the grease to have good extreme pressure and anti-wear properties. Otherwise, the oil film formed between the components will easily break and lose the lubricating effect.

Molybdenum disulfide (MoS2), as an additive to the grease, can effectively increase the maximum non-seizure load of the grease and reduce the coefficient of friction between the friction pairs. Molybdenum disulfide grease is made of low-viscosity PAO, MoS2 solid lubricants and various additives such as antioxidant and anticorrosion. Compared with similar grease, it has stronger pressure and wear resistance, and has excellent adhesion, thermal stability, low temperature and rust resistance, and can withstand greater loads. Such grease can be used for long-term lubrication of gears and sports equipment that need to withstand high loads and shock loads in a wide temperature environment to effectively reduce wear and provide protection against rust and corrosion.

How to evaluate grease carrying capacity? There are three important indicators including maximum nonseizure load (PB), sintering load (PD), and wear value (d). In practical applications, different evaluation indicators can be selected according to the different uses of the lubricant. The index data is mainly obtained through the four-ball experiment test.

Maximum nonseizure load (PB): under a certain temperature and speed, the maximum load diameter of the steel ball in the lubricated state is the size of the wear mark. Smaller the wear mark indicates better anti-wear ability and lubrication of the grease.

Sintering load (PD): increase the load at a certain temperature and speed step by step, when the upper and lower steel balls undergo high-temperature sintering due to excessive load, the load making the equipment has to stop running is the sintering load. The higher the sintering load, the better the lubrication.

Wear Valuen (d): under a certain temperature, speed, load and running time, the surface of the load-bearing steel ball will cause straight wear marks due to friction. 

If you have any inquiry of MoS2 powder, please feel free to contact us:

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Molybdenum Copper Alloy Is Used to Produce Heat Sinks for Vacuum Electronic Devices

In the electronics industry, materials of aluminum and copper are widely used as contacts and heat sinks because they are good thermal conductors. However, due to high coefficient of thermal expansion, they are unable to be used as substrate materials for semiconductors that bear considerable thermal load.

The molybdenum-copper composite material combines high thermal and electrical conductivity of copper and low thermal expansion of molybdenum, with many characteristics of find structure, good electrical and thermal conductivity and low coefficient of thermal expansion. Therefore, molybdenum copper alloy material has wide applications. 

1. Electrical contacts for vacuum switches

Both tungsten copper and molybdenum copper alloy materials can be applicable. Which materials to be elected depends on the requirements of vacuum switches. Choosing the suitable material is able for vacuum switch to achieve the best use effect of the materials.

2. Heat sinks for vacuum electronic devices

Development of millimeter and submillimeter-band vacuum electronic devices put forward special requirements to the properties of structural materials for microfabrication of such basic electronic components as slow-wave structures. One of the promising composite materials for vacuum microelectronic devices is molybdenum-copper alloys.

3. Instrumental components

Due to the many physical properties of molybdenum copper material, such as non-magnetic, constant thermal expansion coefficient, high elastic modulus, high electrical and thermal conductivity, etc., it is suitable for some special requirements of instrument components. In addition, moly copper material has lower density, lighter weight, good plasticity and convenient machining than tungsten cooper material, which is more suitable to be used as instrument materials.

4. Parts of rockets and missiles

MoCu material is more resistant to ablation than molybdenum, and has more plasticity and workability. Therefore, it can replace molybdenum as parts in other weapons, such as extended range guns. 

As a professional manufacturer over two decades, Chinatungsten offers various grades of MoCu products, such as Mo75Cu25, Mo70Cu30. If you have any purchasing plan, kindly feel free to contact us. 

If you have any inquiry of molybdenum copper products, please feel free to contact us:
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What Are Types and Uses of Molybdenum Wires?

Molybdenum is a genuine all-rounder. For example, filament products are used in the lighting industry, semiconductor substrates for power electronics, glass melting electrodes, hot zones in high-temperature furnaces, and sputtering targets for flat panel displays. They are everywhere in our daily life. 

As one of the most highly valued industrial metals, molybdenum material has a very high melting point and will not soften or expand much even under high pressure and temperature. Due to these characteristics, wires made of molybdenum have a wide range of applications, such as automotive and aircraft parts, electric vacuum devices, light bulbs, heating elements and high-temperature furnaces, printer needles and other printer parts.

There are many types of molybdenum wires, including pure moly wire, high-temperature molybdenum wire, molybdenum spray wire and molybdenum wire for EDM. Different types have different characteristics, and their uses are also different.

Pure molybdenum wire has high purity, and its surface is black. After alkali washing, it becomes white. With the characteristic of good electrical conductivity, it can be used as a part of light bulbs. For example, it is used to manufacture filament holders made of tungsten, lead wires for halogen bulbs, and electrodes for gas discharge lamps and tubes. This type of metal wire is also applied in aircraft windshields, where it acts as a heating element to provide defrosting function. In addition, it can be used to make electron tubes and power tube grids.

High-temperature molybdenum wire is also named molybdenum lanthanum wire. This molybdenum-based alloy is more popular than pure molybdenum because it has a higher recrystallization temperature, is stronger and more ductile after exposure to high temperatures. In addition, after being heated to above its recrystallization temperature and processed, the alloy forms an interlocking grain structure to help resist sagging and structural stability. Therefore, it is often used for high-temperature structural materials, such as printing pins, nuts and screws, halogen lamp holders, high-temperature furnace heating elements, and lead wires for quartz and high-temperature ceramic materials.

The molybdenum spray wire is mainly used for wear-prone automotive parts, such as piston rings, gearbox synchronization parts, gear selector forks, etc. A thin layer of coating is formed on the worn surface, which gives vehicles and parts good sliding properties coupled with excellent wear resistance.

While used for EDM, molybdenum wire can cut almost all conductive materials. This would include metals such as steel, aluminum, brass, titanium, and other types of aggregates and superalloys. The hardness of the material is not a factor in EDM machining.

As a professional manufacturer of tungsten and molybdenum with more than 20 years of production experience, Chinatungsten Online can provide all types of molybdenum wires mentioned above for use in various industries.

If you have any inquiry of molybdenum wires, please feel free to contact us:

Email: sales@chinatungsten.com/sales@xiamentungsten.com

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Molybdenum Alloy Plugs to Pierce Stainless Steel Pipes

There are two kinds of steel pipes – stainless steel pipes and welded steel pipes, according to their production methods. Compared with welded steel pipes and other steels, stainless steel pipes are pierced with tools such as plugs and mandrels.

These piercing tools not only participate deformation, but also are the most important factors that determine whether the main processers of steel pipe production, such as piercing and pipe rolling can operate normally. As a matter of fact, the production process of seamless steel pipe also reflects the technical level of these tools. In other words, the research on internal deformation tools is an important subject of seamless steel pipe technology research.

Molybdenum alloy plugs are used to pierce seamless tubes of different materials, such as stainless steel, brazing steel, high-temperature alloy steel and other special parts. As they work in high temperature and harsh environments, the material of plug requires the characteristics of high temperature strength, high temperature oxidation resistance, long service life, corrosion resistance and not easy to stain glass.

Therefore, the material of the plug usually adopts molybdenum alloy with a composition of Ti, Zr, C and Mo. Molybdenum alloy plug is produced in a powder metallurgy process, has a higher recrystallisation temperature and higher strength compared to pure molybdenum, and is readily deformable even at room temperature. These effects are due to mixed crystal formation between Mo and Ti as well as the precipitation of ZrC as a dispersoid.

Actually, the materials to be used depends on what kinds of steel pipes to be pierced. Different materials of pipes have different characteristics and thus require plugs to meet different working conditions. As a professional manufacturer of molybdenum and tungsten, Chinatungsten Online can offer you various kinds of piercing plug. Certainly, customized designs are welcomed. Send us drawings and inform us its detailed application, we will offer you the best solution. 

If you have any inquiry of molybdenum alloy plugs, please feel free to contact us:
Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595

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