Ion plating is a tungsten carbide cutting tool under vacuum, or using gas discharge portion ionized vaporized material, the material in the gas ions or ion bombardment of the evaporator while the evaporation substance or a reactant is deposited on the tungsten carbide substrate . It combines fast evaporation deposition plating and sputtering ion bombardment cleaning surface characteristics, especially with a film adhesion, good diffraction properties of a wide range of materials and plating, etc., so this technique to obtain a rapid development of. Coated tungsten carbide cutting tools most basic features of a neutral particle generating ions are ionized by the action of a particular method, and by the negative bias applied on the substrate, so that the generated ions to the substrate and the coating layer have a sustained bombardment, and achieve the coating deposited on the substrate purpose, generally the better the efficiency of ionization.

Tungsten carbide cutting tool ion plating techniques include: Reactivity evaporation ion plating, hollow cathode ion plating, arc ion plating. And several of the arc ion plating technology, with its high rate of metal ions, help to improve film adhesion and film-based performance; deposition rate, high plating efficiency, simple structure, low voltage, safer, become the most successful and most widely used ion plating.


 

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1. Pitting
   
Pitting tiny white coating on the black dot defects, various shapes, some obvious and rules, easy to find, relatively good control; a small amount of eye "invisible", only with the instrument checks.
    
Analysis:
    
Trachoma mold matrix, porosity, pitting, etc. caused by poor adhesion; while blasting sand mold adhesion, or poor sandy or sandy been caused by impurities, oil, foreign bodies, dust and other pollution; mold when degreasing adherent emulsion, cleaning and other impurities in the water; dosing caused when using compressed air, water and pipes, tools and environment pollution impurities; bath, activated liquid salt particles were not dissolved acidification of the electrode metal can cause pitting.
    
Said pitting can be seen intuitively, and some thin layer of adhesive material of the mold surface, the analysis is mainly contaminated sandy before plating the carbon-based compound. It is solid, strong adhesion gradually becomes acid alkali, anti-vibration high viscosity gum. In degreasing, cleaning difficult to remove once negligence inflow plating process, must be covered by the coating, the naked eye is not easy to find, can not make up.
   
2. Coating roughness
    
Analysis:
   
Bath consisting essentially of nickel sulfate, sodium citrate, sodium tungstate, etc., as well as salts, organic complexes and the like. It was found: mold plating defects and impurities in the bath main relevant. Not high purity chemicals, foreign body in the bath, the bath is frequently used to make the bath metal impurities Cu, Fe, Cr, Co content exceeds the allowable range, can lead to coating roughness, increased pitting and white particles.
    
3. Severely uneven coating thickness
    
Central and side, the corners, R at the coating serious inequality, and even the corners, R occurring at the micro-cracks.
   
Analysis:
    
After the bath using a longer time, the probability of an increase in the coating defects, side and white spherical particles, the corners, especially at the micro-cracks R evident. It was found: When the bath impurities Cu, Fe, Cr, Co content were significantly increased 20,20,20,50mgl, plating quality decreased.




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The method of producing the tungsten oxide photocatalyst of the present invention includes, for example, a method comprising the steps of:

(a) dispersing tungsten oxide particles in an aqueous solution containing a Pt compound dissolved therein in an amount corresponding to 0.03 to 5 parts by weight of Pt based on 100 parts by weight of tungsten oxide particles;

(b) irradiating with visible light in a wavelength range capable of photoexciting the tungsten oxide particles;

(c) adding a sacrificial agent; and

(d) further irradiating with visible light. According to such a method, Pt particles formed from the Pt compound is supported on the surface of tungsten oxide particles as particles having a particle size defined in the present invention, and thus the objective tungsten oxide photocatalyst can be obtained.

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Tungsten oxide,  WO3, is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals.Tungsten ores are treated with alkalis to produce WO3. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to the pure metal.

Methods of selectively etching tungsten oxide relative to tungsten, silicon oxide, silicon nitride and/or titanium nitride are described. The methods include a remote plasma etch using plasma effluents formed from a fluorine-containing precursor in combination with ammonia (NH3). Plasma effluents from the remote plasma are flowed into a substrate processing region where the plasma effluents react with the tungsten oxide. The plasmas effluents react with exposed surfaces and selectively remove tungsten oxide while very slowly removing other exposed materials. Increasing a flow of ammonia during the process removes a typical skin of tungstenoxide having higher oxidation coordination number first and then selectively etching lower oxidation tungsten oxide. In some embodiments, the tungsten oxide etch selectivity results partly from the presence of an ion suppression element positioned between the remote plasma and the substrate processing region.

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Tungsten oxide, also known as tungsten trioxide or tungstic anhydride, WO3, is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals.Tungsten ores are treated with alkalis to produce WO3. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to the pure metal.

Tungsten trioxide is used for many purposes in everyday life. It is frequently used in industry to manufacture tungstates for x-ray screen phosphors, for fireproofing fabrics and in gas sensors. Due to its rich yellow color, WO3 is also used as a pigment in ceramics and paints.

In recent years, tungsten trioxide has been employed in the production of electrochromic windows, or smart windows. These windows are electrically switchable glass that change light transmission properties with an applied voltage.This allows the user to tint their windows, changing the amount of heat or light passing through.

2010- AIST reports a quantum yield of 19% in photocatalytic water splitting with a caesium-enhanced tungsten oxide photocatalyst.
In 2013, highly photocatalytic active titania/tungsten oxide/noble metal (Au and Pt) composites toward oxalic acid were obtained by the means of selective noble metal photodeposition on the desired oxide's surface (either on TiO2 or on WO3). The composite showed a modest hydrogen production performance.

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Tungsten oxide, also known as tungsten trioxide or tungstic anhydride, WO3, is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals.Tungsten ores are treated with alkalis to produce WO3. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to the pure metal.

Tungsten trioxide can be prepared in several different ways. CaWO4, or scheelite, is allowed to react with HCl to produce tungstic acid, which decomposes to WO3 and water at high temperatures.
CaWO4 + 2 HCl → CaCl2 + H2WO4
H2WO4 → H2O + WO3
Another common way to synthesize WO3 is by calcination of ammonium paratungstate (APT) under oxidizing conditions:
(NH4)10[H2W12O42]•4H2O → 12 WO3 + 10 NH3 + 10 H2O

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Tungsten has a rich history dating back to its discovery during the 18th century. Peter Woulfe was the first to recognize a new element in the naturally occurring mineral wolframite. Tungsten was originally known as wolfram, explaining the choice of "W" for its elemental symbol. Swedish chemist Carl Wilhelm Scheele contributed to its discovery as well with his studies on the mineral scheelite.

In 1841, a chemist named Robert Oxland gave the first procedures for preparing tungsten trioxide and sodium tungstate. He was granted patents for his work soon after, and is considered to be the founder of systematic tungsten chemistry.

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Tungsten oxide, also known as tungsten trioxide or tungstic anhydride, WO3, is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals.[1] Tungsten ores are treated with alkalis to produce WO3. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to the pure metal.
2 WO3 + 3 C → 2 W + 3 CO2 (high temperature)
WO3 + 3 H2 → W + 3 H2O (550 - 850 °C)

Tungsten oxide occurs naturally in form of hydrates, which include minerals: tungstite WO3•H2O, meymacite WO3•2H2O and hydrotungstite (of same composition as meymacite, however sometimes written as H2WO4). These minerals are rare to very rare secondary tungsten minerals.

The crystal structure of tungsten trioxide is temperature dependent. It is tetragonal at temperatures above 740 °C, orthorhombic from 330 to 740 °C, monoclinic from 17 to 330 °C, and triclinic from -50 to 17 °C. The most common structure of WO3 is monoclinic with space group P21/n.

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Process for preparing APT comprising the steps of: A. leaching of wet ammonium paratungstate by slowly adding wet ammonium paratungstate to stirred pure water while slowly adding a 1:1 to 1:4 nitric acid (HNO₃) solution to control the solution at pH 3 to 5 for the occurrence of the following reaction:

5(NH₄)₂O.12WO₃.5H₂O+4HNO₃═(NH₄)6H₂W₁₂O₄₀.6H₂O+4NH₄NO₃ when WO₃ content of the solution reaches 130 to 160 g/L, the solution is stirred and boiled for 20 minutes or more, and then filtered to obtain a dilute solution of APT; B. converting the dilute solution of APT to a concentrated solution of APT by standing and aging the dilute solution of APT for 2 to 6 hours, filtering the aged dilute solution of APT to obtain a first filtrate, concentrating the first filtrate by heating, in a reactor, with ammonia water having a concentration in the range of 1:4 to 1:6 to adjust the first filtrate to a pH in the range of 3-4, repeating the heating step until the first filtrate reaches a density in the range of 1.8-2.2, and thereafter cooling the first filtrate for 1-4 hours, filtering the first filtrate to obtain a second filtrate, standing and aging the second filtrate, in a settling tank, for 5-12 hours, and filtering, via a suction filter, the second filtrate to obtain a concentrated solution of APT; and C. spray-drying of the concentrated solution of APT into a powdery APT with a high-speed centrifugal spray-dryer or a spray atomizing dryer.

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Coated tungsten carbide cutting tools with excellent mechanical properties, can improve the machining efficiency and tool life. Rational use of coated tungsten carbide cutting tools are an effective way to reduce processing costs and improve product quality. Although coated tungsten carbide cutting tools, although many advantages, the use of more and more widely used, but it can not fully replace the ordinary uncoated tungsten carbide cutting tools.

(1) The strength and toughness of coated tungsten carbide cutting tools are lower than uncoated tungsten carbide cutting tools, coated tools and therefore not suitable for roughing and interrupted cutting big impact especially under heavy load, and is not suitable for processing with hard Quality inclusions material.
(2) In order to enhance the strength of the coating edge of the blade, blade coating blunt blade to go through treatment, thus coated blade is not sharp if not coated tungsten carbide cutting tools, it is not suitable for a small amount of feed (eg <0 .015mm ) finishing.
(3) Coated tungsten carbide cutting tool at a low speed, prone to flaking, chipping and other phenomena, it is not appropriate for low-speed cutting.
(4) coated tungsten carbide cutting tools are not suitable for processing heat-resistant alloys, titanium alloys, non-ferrous metals and non-metallic materials.
(5) General coated tungsten carbide cutting tools for deep hole drilling, cutting, threading and poor chip difficult to discharge machining results.




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