Molybdenum Electrode Plate And Bars

The appearance of Molybdenum Electrode is of silver gray metallic luster. No off side, off angle, delamination, cracks and other defects, according to user needs can be bent and straightened. According to the chemical composition of the different grades into GMPM, GMHLM, GMHYM three grades.

Molybdenum Electrode has the properties of high temperature high strength, good oxidation resistance, long service life and so on, based on these advantages, it is usually used in household glass, optical glass, insulation materials, glass fiber, rare earth industry and other fields.

The main component of the Molybdenum Electrode is Molybdenum, prepared by a powder metallurgy process. Internationally Molybdenum Electrode ingredients is in 99.95%, higher than the density of 10.15g/cm3, in order to ensure the quality of glass and the life of the electrode. Molybdenum Electrodes commonly used sizes from 20mm to 152.4 mm diameter, single length can reach 1500mm.

Molybdenum Electrodes to replace the existing heavy oil and gas energy, can effectively reduce the pollution of the environment, provide the quality of glass.

Because of high temperature high strength, high temperature oxidation resistance, long life, corrosion resistance and easy to make colored glass and many other properties of Molybdenum Electrode, it can be widely used in household glass, optical glass, insulation materials, glass fiber, rare earth industry and other fields. Molybdenum Electrode diameter is of 10 to 100mm, length is of 150 to 1500 mm.

The texture of Molybdenum Electrode is softer than the Tungsten, the toughness is also better than Tungsten. Tungsten has the unmatched elastic modulus. Molybdenum Electrode has high melting point, good machinability, corrosion resistance, low inflation, ultra-high strength and stiffness at elevated temperatures, excellent thermal performance, scalability, and easy manufacturing and other advantages.

Molybdenum Electrode Plate and Bars should transport moisture anti-collision, stored in ventilated, dry place and no acid atmosphere, prevent oxidation, the storage period should not exceed six months.

Why Should We Use Fire Resistant EPS?

February 9, 2009, the new site campus cultural center in the construction of CCTV occurred particularly serious fire accident. Caused a firefighter died, six firefighters and two construction workers were injured in the rescue process. Building fire, smoke over an area of 21333 square meters, of which burned area 8490 square meters, causing direct economic losses of 163.83 million yuan. This is a liability accident.

The direct cause of the accident was there was someone without the consent of the relevant departments on the construction site within the illegal organization large-scale fireworks setting off activity.

But one of the main indirect reasons is that in the cultural center, the used of a large number of unqualified insulation board curtain wall project.

Usually, the insulation wall are made of polystyrene foamed materials or foamed polyurethane material, but if it is not doing a good flame retardant treatment, the fire and quickly spread to every corner of the building just like a fuse.

Expandable Polystyrene, EPS, which is commonly known as White Foam, is currently the most widely use, high ratio of foam plastics varieties. Expandable Polystyrene EPS is widely used in packaging, building and road area and so on, and can be subdivided into Flame Retardant EPS and Fire Resistant EPS.

EPS need flame retardant processing when used in the construction field, the method is in the synthesis of EPS masterbatch added as flame retardants (usually HBCD). Treatment of flame retardant, flame retardant effect of EPS can be increased from V-2 level to V-1 level or V-0 level, meet the requirements of building fire retardant.

Compared with Flame retardant substandard EPS foam board, Flame Retardant EPS foam is not such expensive, illegal manufacturer in order to save money and benefit, create such a great loss!

Usage and Applications of Polyvinyl Alcohol PVA

Polyvinyl Alcohol ( referred to as PVA) white powder, is a wide range of uses of the water-soluble polymers, performance between the plastic and rubber, its use can be divided into two major fiber and non-fiber applications.

PVA has a unique strength in adhesion, film flexibility, smoothness, oil resistance, solvent resistance, protective colloid property, gas block, and abrasion resistance as well as having a specially treated water resistance. Therefore, in addition to fiber materials for outside, is also used extensively for the production of coatings, adhesives, paper processing agent, emulsifier, dispersant, film and other products. Range of applications throughout the textile, food, medicine, construction, wood processing, paper making, printing, agriculture, steel, polymer and chemical industries.

Performance: Polyvinyl Alcohol Resin products is white solid, good points flocculent, granular, powdery three kinds. It is non-toxic, tasteless, non-polluting, can be dissolved in water 80--90 ℃. Its aqueous solution has good adhesion and film-forming properties; resistance to most organic solvents oils, hydrocarbons, lubricants and the like; polyhydric alcohols with long -chain esterification, etherification, acetalization and other chemical properties.

Usage: Polyvinyl Alcohol PVA is mainly used in the textile industry warp pulp , textile finishing agents, Polyvinyl Alcohol fiber materials. 107 plastic construction and decoration industries, interior and exterior paints, adhesives. In chemical industry as a polymeric emulsifier, dispersant and polyvinyl formal, acetal, butyral resin. In Paper and paper industry as a binder. In Agriculture for soil amendments, pesticides and polyvinyl alcohol film adhesion synergist. Also can be used for cosmetics and induction hardening agent aspects.

The way to test whether this product completely dissolved: Take out a small amount of solution, add 1 ~ 2 drops of iodine solution, if there is a blue granular white body, that has not been completely dissolved, such as color can be evenly spread, has completely dissolved. 

Vanadium Pentoxide Catalyst for Manufacture of Sulfuric Acid

SO3 to SO2 by catalytic (Vanadium Pentoxide) oxidation process was usually not separated it out but directly converted into sulfuric acid. SO3 reacts violently with water, heat to generate H2SO4, but usually no water absorption SO3, because a lot of heat for the evaporation of the water vapor and SO3 formation of acid mist will affect the absorption efficiency, so the use of concentrated sulfuric acid was prepared to absorb SO3 fuming industrial sulfuric acid, diluted sulfuric acid and then can be obtained.

Now the production of sulfuric acid method is contact method, the raw material is still pyrite. The pyrite oxidation of sulfur dioxide in the air, then Vanadium Pentoxide, iron oxide and cuprous oxide as catalyst, the oxidation of sulfur dioxide to sulfur trioxide, sulfur trioxide react with water to form sulfuric acid. The resulting 98% sulfuric acid, known as concentrated sulfuric acid.

sulfuric most important chemical industry is prepared by the contact method. The main raw material for the fuel

contact method Seoul to sulfur or iron sulfide sulfur dioxide and oxygen in the air, oxidation of sulfur dioxide to sulfur trioxide, absorption of the water, any concentration of acid can be obtained. Only then oxidized, there must be some kind of contact with the presence of starting role when; most commonly used in platinum and Vanadium Pentoxide. Spontaneous combustion of sulfur dioxide derived from it may be directly oxidized iron sulfide if spontaneous combustion burner, derived who must first drop of cold, wash them with acid or by filtration method or by the precipitation method to make clean; dust, sulfur vapor, arsenic, phosphorus and other substances were stored in the gas stream must be removed lest they harm and contact agent for impurities lighter than the platinum oxidation alum hazards.

Contact legal sulfuric acid reaction principle: burning sulfur or metal sulfide sulfur dioxide and other raw materials from the system. Sulfur dioxide in the appropriate temperature of the catalyst under the effect of oxidation of sulfur trioxide, sulfur trioxide in the compound with water to form sulfuric acid.

The Properties and Applications of Molybdenum Steel

Properties of Molybdenum and Tungsten are very similar, the boiling point and the conductive performance is outstanding, the linear thermal expansion coefficient is small, easy processing of tungsten. Molybdenum is a kind of chemical element, chemical symbol is Mo, its atomic number is 42, is a kind of gray transition metal. Pure metal molybdenum is silvery white, very hard. Add a small amount of molybdenum to steel, hardened steel. Molybdenum is a very important nutrients to plants, were found in some of the enzyme. And Tungsten is a kind of steel grey or silver white metal, with high hardness and hard melting point. Its atomic number is 74, the atomic weight of it is 183.85. The melting point of it is 3410℃, the boiling point of it is 5900℃, thermal conductivity is 10 to 100 for 174 w/m*k. Slow evaporation at high temperature, the thermal expansion coefficient is very small, the expansion coefficient at 0 to 100 ℃, 4.5 × 10-6 · K-1. The resistance of tungsten is about 3 times larger than the resistance of copper.

lloy steel, stainless steel, tool steel and cast iron is the main field of application of Molybdenum, the Molybdenumproduction determines the demand, the effect of Molybdenum in the steel is as following:

1. To reduce the cooling rate to the appropriate values to obtain a hard martensite, which can improve the strength, hardness and toughness of a large section components.

2. Reduce the temper brittleness.

3. The resistance to hydrogen embrittlement.

4. The resistance to sulfide stress cracking.

5. Improve the high strength.

6. To improve the corrosion resistance of stainless steel, especially the anti chloride pitting.

7. To improve the high strength low alloy steel welding performance.

As steel Molybdenum alloy additives are the most important uses , according to statistics of 1986, which accounts for the total world consumption of 83% of Molybdenum. And where a steel containing Molybdenum World crude steel production has accounted for 1/10. Therefore, Molybdenum steel than is often used as an industrially developed country or one of the signs. 

Types of Silicone Rubber and Basic Features

Silicone Rubber products can run a large amount of electric power system, and this should thanks largely to its excellent water repellency, water repellency and stain-resistant flash capability. Current products on the market, mainly as the following three categories:

Room Temperature Vulacanized Silicone Rubber (RTV Silicone Rubber):

This kind of Silicone Rubber has excellent hydrophobic properties and contamination resistance properties, hardness is low, but because of the RTV, and various aspects of mechanical properties and resistance erosion ability is poor, aging is worse.

Room Temperature Vulacanized Silicone Rubber is with room temperature curing, good mobility, forming process is simple and can operate on the spot.

High Temperature Vulcanized Silicone Rubber (HTV Silicone Rubber):

This kind of Silicone Rubber has the resistance to aging, resistance to tracking and erosion, water repellent, stain proof, fire retardant, ozone resistant, UV resistant, dampness resistant, resistant to high and low temperature and tearing strength of character.

High Temperature Vulcanized Silicone Rubber is with 140 to 180℃ high temperature curing, poor mobility, special shapes or large equipment moulding process complex. Oxidant gas production and retained in the product, and mold corrosion.

Liquid Silicone Rubber (LSR):

This kind of Silicone Rubber is with all the advantages of High Temperature Vulcanized Silicone Rubber, it has excellent properties on technological properties of the proof tracking, high and low temperature resistance and hydrophobic properties and so on.

Liquid Silicone Rubber is with 90 to 140℃ curing, good flowability, components directly in the Silicone Rubber of Platinum catalysts, two-component mixed crosslinked, forming process is simple. Particularly suitable for external insulation of large equipment, and no damage to mould.

Molybdenum Dioxide And Molybdenum Trioxide

Molybdenum Dioxide, is a kind of brown-black powder with steel shiny purple. The density of Molybdenum Dioxide is 6.44 g/cm3, we can get Molybdenum when heat the Molybdenum Dioxide  with hydrogen the temperature is above 500℃. And generate Molybdenum Oxychloride reaction with chlorine, and hydrogen chloride, alkaline,acid reaction. And it is very slightly soluble in Sulfuric Acid, Nitric Acid and Silver Nitrate. Oxidation of Molybdenum Dioxide can get Molybdenum Trioxide. Can be made of metal Molybdenum in steam heating, or heating to 470 ℃ MoO3 in hydrogen reduction of. Used in producing Molybdenum and other Molybdenum compounds.

Molybdenum is a silver-white metallic powdered Molybdenum gloss black, the melting point of it is 2610℃, the boiling point of it is 5560℃, the density of it is 10.2g/cm3. Molybdenum is very stable at room temperature in air, when the temperature was raised to 600℃, quickly react with oxygen to produce the more volatile Molybdenum Trioxide. At 500 to 1150 ℃ reduction with hydrogen trioxide or Ammonium Molybdate , Molybdenum can be available. MoO3 molecular weight of 143.94. White transparent rhombic crystals, to yellow when heated, cooled and restore the original color. Density 4.692g/cm3, melting point 795 ℃, boiling point 1155 ℃, easy sublimation. Insoluble in water, can be melted in a solution of ammonia and alkali generated Molybdate. Dissolved in acid, Molybdenum Dioxide generated root (MoO22 +) and Molybdenum Oxide root (MoO4 +) complex cation to form a soluble complex with the acid group. Oxidizing very weak at high temperature may be hydrogen, carbon, aluminum reduction. Reagents for the analysis, Molybdenum and Molybdenum alloy salt preparation. Ignition or Molybdenum or Molybdenum Disulfide to obtain calcined in air Molybdate.

While the Molybdenum Dioxide is different from Molybdenum Trioxide, it has two oxygen atoms, Molybdenum Dioxide, brown black powder, with steel shiny purple. Oxidation of it is very weak, at high temperature can be hydrogen, carbon, aluminum reduction. Used as an analytical reagent, preparation of Molybdenum and Molybdenum salt. Burning Molybdenum or Molybdenum Disulfide in air or roasting Molybdenum prepared.