What Are Carbon Composition Resistors?

Carbon and graphite materials are non-metallic solid materials mainly composed of carbon. Among them, carbon materials are basically composed of non-graphite carbon, while graphite materials are basically composed of graphite carbon. Not only graphite, but also diamond, fullerene, carbene, all carbon-containing materials are called carbon materials. ^[1]

Chinese name: Carbon
Solid: Carbon and graphite materials

Main features: Lightweight, porous, etc.
Main products: Graphite electrodes

The main characteristics of carbon

Light weight, porous, conductive, thermal conductivity, corrosion resistance, lubricity, high temperature strength, heat resistance, thermal shock resistance, low thermal expansion, low elasticity, high purity, processability.

Carbon main classification

Carbon products can be divided into graphite electrodes, carbon blocks, graphite anodes and carbon

Carbon materials (2 photos)

Electrodes, pastes, electric carbons, carbon fibers, special graphites, graphite heat exchangers, etc. Graphite electrodes can be divided into ordinary power graphite electrodes according to the allowed current density. High power electrode, ultra high power electrode. The carbon block can be divided into blast furnace carbon block, aluminum carbon block, electric furnace block and so on. Carbon products can be divided into carbon products, graphite products, carbon fibers and graphite fibers according to the processing depth. Carbon products can be divided into graphite products, carbon products, carbon fiber, special graphite products, etc. according to different raw materials and production processes. Carbon products can be divided into more ash products and less ash products (with ash content below 1%) according to the ash content. ^[2]

The national technical standards and ministerial technical standards for carbon products in China are classified according to the different uses of the products and different production processes. This classification method basically reflects the different uses of products and different production processes, and is also convenient for accounting, so its calculation method also uses this classification standard. The classification and description of carbon products are introduced below.

The upstream companies in the carbon industry are: 1. anthracite calcination enterprises; 2. coal tar processing and production enterprises; 3. petroleum coke production and calcination enterprises.

Carbon main products

Carbon carbon heat sink

The carbon heat sink is directly attached to the chip surface in the form of a sticker. The carbon heat sink can be very tightly adhered to the attached object because of its softness;

In addition, because of its high thermal conductivity (5 to 15 times that of resin);

High thermal conductivity in the lateral direction (twice as copper), compared with thermally conductive silicone, silicone sheet, metal sheet, etc. in traditional use:

230W / MK

Copper 390W / MK

Silicone 5-20W / MK

High carbon heat dissipation film 200-700W / MK

Heat sink for high heat conduction plane:

With its high thermal conductivity on the plane (twice as copper), it can quickly transfer heat to the metal shell and heat dissipation profile, reduce the temperature of the heating point, and achieve better heat dissipation.

Carbon graphite electrode

It is mainly made of petroleum coke and needle coke, coal tar is used as a binder, and calcined, compounded, kneaded, pressed, roasted, graphitized and machined. Conductors that are melted by heating, depending on their quality

Carbon products The quantity index can be divided into ordinary power, high power and ultra high power. ^[2] Graphite electrodes include:

(1) ordinary power graphite electrode. Graphite electrodes with a current density lower than 17A / cm ² are allowed. They are mainly used for ordinary power electric furnaces such as steelmaking, siliconmaking, and yellow phosphorus.

(2) Graphite electrode with anti-oxidation coating. A graphite electrode coated with an anti-oxidation protective layer on the surface forms a protective layer that can conduct electricity and resist high-temperature oxidation, reducing electrode consumption during steelmaking.

(3) High power graphite electrode. Graphite electrodes with a current density of 18 to 25 A / cm ² are allowed. They are mainly used in high-power electric arc furnaces for steelmaking.

(4) Ultra-high power graphite electrode. A graphite electrode with a current density greater than 25 A / cm ² is allowed. Mainly used in ultra-high power steelmaking arc furnaces.

Carbon graphite anodes

It is mainly made of petroleum coke and coal pitch as a binder, and is made by calcining, batching, kneading, pressing, baking, impregnation, graphitization, and machining. Generally used as a conductive anode for electrolytic equipment in the electrochemical industry. include:

(1) Various anode plates for chemical industry.

(2) Various anode rods.

Carbon Special Graphite

Mainly using high-quality petroleum coke as raw material, coal tar or synthetic resin as binder, through raw material preparation, batching, kneading, tabletting, crushing, re-kneading, molding, multiple firing, multiple impregnation, purification and graphitization Made by processing. Generally used in the aerospace, electronics, and nuclear industries.

It includes spectrally pure graphite, high purity, high strength, high density, and pyrolytic graphite.

Carbon graphite heat exchanger

Impervious graphite products for heat exchange are manufactured by processing artificial graphite into the required shape, and then impregnated and cured with resin. It is a heat exchange device processed with artificial impervious graphite as the base. Used in the chemical industry. include:

(1) Block-hole heat exchanger;

(2) Radial heat exchanger;

(3) Falling film heat exchanger;

(4) Tubular heat exchanger.

Carbon carbon electrode

Conductive electrodes made of carbonaceous materials such as anthracite and metallurgical coke (or petroleum coke) and coal pitch as the binder, without being graphitized, and pressed and fired. It is not suitable for electric furnaces for smelting high-grade alloy steels. include:

(L) Multi-ash electrodes (electrodes produced from anthracite, metallurgical coke and pitch coke);

(2) Regenerative electrodes (electrodes produced from artificial graphite and natural graphite);

(3) Carbon resistance rod (ie carbon grid brick);

(4) Carbon anode (pre-baked anode produced with petroleum coke);

(5) firing the electrode blank.

Carbon carbon block

Anthracite and metallurgical coke are used as the main raw materials, and coal pitch is used as the binder. The raw materials are prepared, compounded, mixed, shaped, roasted, and machined. Among them, the blast furnace charcoal block is used as a high temperature and corrosion resistant material for the lining of the blast furnace; the bottom carbon block, the side carbon block, and the electric furnace block are used in aluminum electrolytic cells and iron alloy electric furnaces. include:

(1) Blast furnace carbon block;

(2) Aluminum block carbon block (bottom carbon block and side carbon block);

(3) Charcoal block of electric furnace.

Carbon paste

It is made with petroleum coke, anthracite, metallurgical coke as the main raw materials, and coal pitch as the binder. Some are used as electrode pastes for various self-baking electric furnaces as conductive electrodes; some are used as anode pastes for continuous self-baking aluminum tanks as conductive anodes; some are used as fillers for blast furnace masonry and rough Stitches and fine seams. Although the use of self-baking carbon blocks for blast furnaces is different, it is similar to the production process of paste products and temporarily belongs to paste products. include:

(1) Anode paste;

(2) electrode paste (including standard and non-standard electrode paste);

(3) base paste (including more gray and less gray base paste);

(4) Airtight paste (including airtight and less gray airtight paste);

(5) Other pastes (including rough joint paste, fine joint paste, self-baked carbon brick, etc.).

Carbon non-standard carbon, graphite products

This refers to all kinds of special-shaped carbon and graphite products that are modified by carbon and graphite products after further processing. Including spade anodes, fluorine anodes, and crucibles, plates, rods, blocks and other special-shaped products of various specifications.

Carbon Impervious Graphite

This refers to various graphite shaped products made by impregnation and processing of resin and various organic substances, including the matrix block of the heat exchanger.

Carbon electric carbon products

This refers to products such as carbon rods and brushes.

Carbon fiber

It includes all kinds of carbon fiber, graphite fiber, pre-oxygen wire, carbon cloth, carbon belt, carbon rope, carbon felt and composite materials. The carbon fiber is a fiber with a carbon content higher than 93%. Carbonized with polypropylene fiber, viscose yarn and pitch fiber. The heat treatment temperature is from low to high, and can be made into heat-resistant fiber, carbon fiber and graphite fiber, respectively.