Electrode paste is the conductive electrode of various submerged arc furnaces, and it is an indispensable product in industrial production.
In the national standard of electrode paste, there is no quality index of mechanical strength of electrode paste, only the quality index of compressive strength of electrode paste. The mechanical strength itself includes compressive strength and has certain relevance. As a national standard, it may not be able to put everything into the quality standard,.
The mechanical strength of electrode paste includes compressive strength, flexural strength and tensile strength.
The mechanical strength of carbon products is anisotropic, that is, the composition of raw material particles of carbon products is different in horizontal and vertical directions. Due to the production method of electrode paste, we will not discuss the anisotropy of mechanical strength of electrode paste here.
The raw material composition of electrode paste, that is, different raw materials, particle size and proportion of raw materials, thickness and proportion of powder, and the content of coal tar pitch all have an impact on the mechanical strength of electrode paste
During the sintering process, the mechanical strength of electrode paste increases with the increase of temperature [0-2200 degrees in a certain temperature range].
When the sintering temperature of the electrode paste is below 300 ℃, the electrode paste is in a plastic state, and the mechanical strength is measured by technicians. At this time, the compressive strength is only 3-10 MPa, and there is almost no tensile strength. The electrode paste soft breaking accident of submerged arc furnace often occurs in this section.
When the sintering temperature of electrode paste is 300-800 ℃, as the volatile of coal tar pitch has been discharged, the remaining coal tar pitch has been carbonized to form a network, which is fused with the raw materials of various electrode pastes, and the mechanical strength reaches the standard value. Technicians calculated that the compressive strength of the electrode paste at this time was 17-33 MPa, the flexural strength was 7-17 MPa, and the tensile strength was 4-8 MPa.
After the electrode below the copper tile of the submerged arc furnace enters the smelting process, due to the further rise of the raw material temperature, the temperature of the electrode will also rise further, and the mechanical strength will increase with the rise of the temperature. When the temperature rises to 1500 ℃, the mechanical strength of other materials will drop sharply, such as heat-resistant alloys, while the mechanical strength of carbon materials is still increasing at 1500 ℃, The mechanical strength of carbon materials began to decline gradually only at 2200 ℃. Therefore, carbon materials have unique advantages as high temperature resistant materials
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