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Sulfides of industrial significance are antimony trisulfide and antimony pentasulfide. The physical and chemical properties of barium sulfide are listed in the table below.
Table Physical and chemical properties of barium sulfide
species | Physical properties | Chemical properties |
Disulfide Sb 2 S 3 | There are two forms of crystalline and amorphous, if the former belongs to the orthorhombic system, color ashes, gold metallic luster, density 4.642g / cm 3, hardness HB2 ~ 2.5. Specific heat capacity (20 ~ 500 ° C) 0.34158J ∕ (g · K), melting point 550 ° C, boiling point 1080 ~ 1000 ° C, heat of evaporation 61296J ∕ mol, heat of fusion 23430 ~ 28953J ∕ mol The relationship between vapor pressure (Pa) and temperature is: Lgp=14.671-11200∕T (673K≤T<773K) Lgp=9.915-7068∕T(773K≤T≤1223K) Crystalline antimony trisulfide exists in the natural world as stibnite. Amorphous antimony trisulfide is artificially produced. It has black, gray, red, yellow, brown and purple colors depending on the formation conditions and particle size. | Almost no less than water (solubility of about 0.0176% at 18 ° C), can be slowly oxidized to Sb 2 O 3 in boiling water, easily decomposed by heat, it is already obvious at 600 ° C, the decomposition pressure at 880 ° C can reach 2452.58 Pa; Oxidation, heating to 290 ° C when the particle size is 0.1 mm, ie spontaneous combustion, the reaction is: 2Sb 2 S 3 +9O 2 = 2Sb 2 O 3 + 6SO 2 This reaction is the basis of the volatile calcination; it can be oxidized to SbCl 3 by Cl 2 or FeCl 3 to precipitate elemental sulfur, which is the basis for the oxidative-hydrolysis method to obtain ruthenium. Sb 2 S 3 can form Na 3 SbS 3 with Na 2 S, which is the basis of alkaline leaching wet refining; Sb 2 S 3 and Sb 2 O 3 can be interactively converted into metal ruthenium and SO 2 , but in an inert atmosphere, 2Sb 2 S 3 ·Sb 2 O 3 (germanium glass) is formed, and Sb 2 S 3 can be replaced by iron. Metal ruthenium, this reaction is the basis of precipitation smelting |
Disulfide Sb 2 S 5 | Often a golden yellow amorphous powder, commercially known as golden enamel, with a density of 4.12 to 4.2 g ∕ cm 2 | The molecular composition is Sb 2 S 3 ·2S, which is easy to spontaneously ignite in air. It can be decomposed into Sb 2 S 3 and elemental sulfur when heated to 120-170 ° C. Industrially, sulfuric acid or hydrochloric acid and sodium thiocyanate are used. Preparation of Sb 2 S 5 |
Nickel Based Laser Cladding Powder
Ni base alloy powder is mainly made of NiCrBSi or NiBSi. Ni-based self-fluxing powder has good wettability, corrosion resistance and high temperature self-lubricating effect, and is used in components with heat resistance, corrosion resistance and thermal fatigue resistance. In general Ni35,Ni45,Ni60 etc can be used for laser cladding, the No means hardness of powder. Inconel 625 and 718 has good corrosion property under higher temperature, also widely used for laser cladding process.
Cobalt based Laser Cladding Powder
Cobalt-based alloy powder is the cemented carbide resistant to various types of wear and corrosion as well as high temperature oxidation. That is, the so-called cobalt-chromium-tungsten (molybdenum) alloy or Stellite alloy cobalt-based alloy is mainly composed of cobalt, containing a considerable amount of nickel, chromium, tungsten and a small amount of molybdenum, niobium, tantalum, titanium, Alloying elements such as lanthanum, and occasionally a class of alloys containing iron.
Co-based self-fluxing alloys have good high temperature performance and wear resistance and corrosion resistance, and are used in petrochemical power, metallurgy and other industrial fields where they are wear-resistant, corrosion-resistant and high-temperature resistant.
Iron based Laser Cladding Powder
The work pieces required for laser cladding and manufacturing in the actual industry are mainly carbon steel and cast steel. The Fe-based alloy is close to the base material in composition and has good wettability. The advantage of Fe base powder is lower cost and good wear resistant of cladding layer. As a result, it`s the most widely used for laser cladding process. It is suitable for parts that require local wear resistance and are easily deformed.
WC blended Laser Cladding Powder
Tungsten carbide blended with Ni alloy powder is the best choice for wear resistant work piece. This unique process can bring excellent wear, corrosion and high temperature resistant. Our blend powder can achieve different portion of WC from 35% to 60% without crack under suitable cladding parameter.
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