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The properties, synthesis methods and applications of titanium carbide

wallpapers News 2020-05-11
TiC light gray, cubic crystal system, insoluble in water, has high chemical stability, almost no chemical reaction with hydrochloric acid, sulfuric acid, but can be dissolved in aqua regia, nitric acid, and hydrofluoric acid, but also soluble in alkaline Oxide solution.

TiC is an iron-gray crystal with metallic luster, belonging to a simple cubic structure of NaCl type, with a lattice constant of 0.4329 nm and a space group of Fm3m. The carbon atoms and titanium atoms are equivalent at the lattice position, and the TiC atoms are very strong. The covalent bond combination has several characteristics similar to metals, such as high melting point, boiling point and hardness, hardness is second only to diamond, has good thermal conductivity and electrical conductivity, and even shows superconductivity at extremely low temperatures. Therefore, TiC is widely used in the manufacture of cermets, heat-resistant alloys, cemented carbides, anti-wear materials, high-temperature radiation materials, and other high-temperature vacuum devices. The composite materials prepared with TiC are used in machining, metallurgy, minerals, aerospace and fusion reactors. And other fields have a wide range of applications.

 
It can be prepared by heating bone charcoal and titanium dioxide in an electric furnace. It is an important component of cemented carbide. Used as a cermet, it has the characteristics of high hardness, corrosion resistance and good thermal stability. It can also be used to make cutting tools. Used as a deoxidizer in the steelmaking industry.

Titanium carbide is a typical transition metal carbide. Its bond type is composed of ionic bonds, covalent bonds and metal bonds mixed in the same crystal structure, so titanium carbide has many unique properties. The crystal structure determines the basic charac teristics of titanium carbide with high hardness, high melting point, wear resistance and electrical conductivity. Titanium carbide ceramics are the most widely developed materials among titanium, zirconium, and chromium transition metal carbides.

Resolve resolution

1.Using titanium dioxide and carbon black as raw materials, high-purity titanium dioxide and carbon black are fully mixed in proportion, and the dry powder mixture is pressurized to form, using a horizontal carbon tube furnace or a vertical carbon tube furnace, under a hydrogen atmosphere, at 1900 ~ 2300 ℃ reduction system The bulk TiC is obtained, and the titanium carbide powder product is obtained by crushing. Or using sponge titanium and carbon black as raw materials, the sponge titanium (or titanium alloy, titanium scrap recovered from carbide solid solution) and carbon black are fully mixed in proportion and heated to 1500-1700 ℃ in a high-purity hydrogen gas flow reaction system Get titanium carbide.

2. Direct carbonization of titanium metal

Titanium powder (reduced from sodium or decomposed by titanium hydride, 325 mesh or less) and carbon black are mixed and shaped under a pressure of about 0.98 Pa. Then put the material into a graphite container and heat it to 1500 ~ 1700 ℃ in a high-purity hydrogen gas flow to make carbon infiltrate. The reaction temperature and retention time depend on the type of raw materials, particle size and reaction performance.

3. Gas-phase reaction method

The steam of titanium tetrachloride and hydrogen containing hydrocarbons (methane, benzene, etc.) are mixed and sent to the substrate for depositing titanium carbide which has been heated by induction heating or other methods, and the titanium carbide is precipitated by reaction. The reaction conditions such as the concentration ratio of the reaction gas, the reaction temperature, and the gas flow rate are different, and the form of the precipitated titanium carbide is also different.

4. High-temperature self-propagating synthesis method (SHS)

The SHS method originates from an exothermic reaction. When heated to an appropriate temperature, fine-grained Ti powder has high reactivity, therefore, once the combustion wave generated after ignition passes through the reactants Ti and C, Ti and C will have enough reaction heat to generate TiC The SHS reaction is extremely fast, usually less than a second. This synthesis method requires high-purity, fine Ti powder as raw material, and the output is limited.

5. Preparation of nano-TiC powder by reactive ball milling technology

The reactive ball milling technology is a technology that uses the chemical reaction between the metal or alloy powder and other elements or compounds during the ball milling process to prepare the required materials. The main equipment for preparing nano-materials using reactive ball milling technology is a high-energy ball mill, which is mainly used to produce nano-crystalline materials. The mechanism of reactive ball milling can be divided into two categories: one is the mechanically induced self-propagating high-temperature synthesis (SHS) reaction, and the other is the reaction ball milling without obvious heat release, and the reaction process is slow.

6. Microwave synthesis of nano-TiC

Microwave synthesis of TiC powder. Studies have shown that the TiC nanopowder synthesized by microwave, the particle size of the product is related to the particle size of the raw materials used, but also related to the structural properties of the raw materials used. Therefore, choosing appropriate raw materials and process conditions, using microwave technology can synthesize nano TiC powder with less agglomeration and excellent performance under lower temperature conditions (1300 ': C).

Use

1. Used as an additive for cutting tool materials and metal bismuth, zinc, cadmium melting crucibles to prepare semiconductor wear-resistant films, HDD large-capacity memory devices.
2. The most important use of titanium carbide is as an additive for cutting tool materials and metal bismuth, zinc, cadmium melting crucibles, to prepare semiconductor wear-resistant films, HDD large-capacity memory devices.

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