Composite coating for improving surface hardness and wear resistance of U-shaped roller and production process of U-shaped roller
A composite coating and roller surface technology, applied in metal material coating process, coating, roller, etc., can solve the problems of low surface hardness and strength, change of matrix structure, high firing temperature, etc., and achieve good ductility , the effect of improving toughness
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Embodiment 1
[0030] Embodiment 1: as Figure 1 to Figure 2 As shown, the production process of U-shaped rollers, the process steps are as follows: first, the billet is spirally roughened, and then preheated to 250-320 °C. The surface of the frequency conversion roller is oxidized or carbonized to form an oxide layer or a carbide diaphragm. Once the diaphragm is formed, it will inevitably affect the bonding ability between the coating and the roller body. By setting the temperature to this temperature range, it will not be on the surface of the roller body. Forming a diaphragm can also effectively improve the bonding ability between the roller body and the coating;
[0031] Secondly, the raw materials of the alloy fusion layer, thermal barrier composite layer and surface working layer are thermally sprayed onto the surface by oxyacetylene gas respectively, and then remelted to obtain a composite coating of semi-fused micro-metallurgy. The remelting temperature is controlled at 1000 ~1200°C...
Embodiment 2
[0040] Embodiment 2: The components of the alloy fusion layer include by weight: 0.8 parts of C, 15 parts of Cr, 3.0 parts of B, 5.0 parts of Si, 13 parts of Fe, the balance being Ni and trace residual impurities, Calculated according to REC=(B+Si) / 5(C+Cr)+Cr / 6Ni, the chemical composition satisfies 0.14≤REC≤0.15; wherein, the composition of the thermal barrier composite layer includes by weight: 0.50 parts of C, 17 parts of Cr, 3.0 parts of B, 5.0 parts of Si, 15 parts of Fe, 3.4 parts of Co, the balance is Ni and trace residual impurities, according to REC=(B+Si) / 5(C+Cr)+ Calculated by (Cr+Co) / 6(Ni+Co)+Co / 8(Ni+Co), the chemical composition satisfies 0.14≤REC≤0.16; wherein, the composition of the surface working layer includes by weight: 2.1 parts of C , 12 parts of Cr, 3.9 parts of B, 3.5 parts of Si, 14 parts of Fe, 37 parts of W, the balance being Ni and trace residual impurities, according to REC=(B+Si) / 5(C+Cr)+ Calculated by (Cr+W) / 6(Ni+W)+W / 12(Ni+W), the chemical compos...
Embodiment 3
[0041] Embodiment 3: The components of the alloy fusion layer include by weight: 1.0 parts of C, 16 parts of Cr, 3.8 parts of B, 4.2 parts of Si, 15 parts of Fe, and the balance is Ni and trace residual impurities, Calculated according to REC=(B+Si) / 5(C+Cr)+Cr / 6Ni, the chemical composition satisfies 0.11≤REC≤0.14; wherein, the composition of the thermal barrier composite layer includes by weight: 0.65 parts of C, 15 parts of Cr, 3.8 parts of B, 3.5 parts of Si, 16 parts of Fe, 2.6 parts of Co, the balance is Ni and trace residual impurities, according to REC=(B+Si) / 5(C+Cr)+ Calculated by (Cr+Co) / 6(Ni+Co)+Co / 8(Ni+Co), the chemical composition satisfies 0.15≤REC≤0.16; wherein, the composition of the surface working layer includes by weight: 2.3 parts of C , 10 parts of Cr, 3.6 parts of B, 3.7 parts of Si, 15 parts of Fe, 33 parts of W, the balance being Ni and trace residual impurities, according to REC=(B+Si) / 5(C+Cr)+ Calculated by (Cr+W) / 6(Ni+W)+W / 12(Ni+W), the chemical compo...
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