Introduction SiC Ceramic Bushing
Silicon carbide sic bushing is a new type of high-tech and wear-resistant material in the world. It was made of high-purity silicon carbide powder, high-purity high-temperature carbon black and binders,by pouring, blanking, sintering, and sand-removing processes,made of a composite high wear product.
It is currently used as a bushing in mining equipment,such as copper, gold, iron ore,nickel ore and other in non-ferrous metals.It plays a role of high wear resistance,the wear life is more than 10 times that of conventional steel bushings and alumina bushing.
1.Application of sic bushing in the mining industry
For mine filling, the concentrate powder and tailings transportation has serious wear on the pipeline.The service life of the ore powder conveying pipeline used in the past is less than one year, and now choose silicon carbide bushings can increase the service life by more than 10 times.
2.Why silicon carbide linings are widely used in the mining industry?
Due to the wear resistance of ceramic tubes, the following is a comparison of wear resistance of ceramic tubes and other materials.
Comparison of wear resistance of silicon carbide bushings
| Sandblasting contrast test（SiC sand） | 30%SiO2 mud slurry contrast test | ||
| Material | Reduced volume | Material | Reduced volume |
| 97% alumina tube | 0.0025 | 45steel | 25 |
| Silicon carbide bushing | 0.0022 | Silicon carbide bushing | 3 |
Characteristics SiC Ceramic Bushing
3.Other physical and mechanical properties of ceramic wear resistant pipes in the mining industry
| Item data material | Strength HV kg/mrn2 | Bending strength MPa | Surface material | Ceramic layer density g/cm3 | Compressive shear strength MP | Resistance to mechanical shock | Thermal shock resistance |
| Steel tube | 149 | 411 | |||||
| SiC bushing | 1100-1400 | 300-350 | smooth | 3.85-3.9 | 15-20 | 15 | 900 |
4.Another feature of silicon carbide bushings used in mines – small loss of running resistance
Test on resistance characteristics of powder, slag and ash transportation,the results are as follows:
| Material | Absolute roughness （△） | Absolute roughness（△/D） | Water resistance coefficient | ||
| Hydraulic transmission | Pneumatic conveying | Hydraulic transmission | Pneumatic conveying | ||
| Ordinary steel tube | 0.119 | 0.20 | 7.935×104 | 1.343×103 | 0.195 |
| Ceramic composite pipe | 0.117 | 0.195 | 7.935×104 | 1.343×103 | 0.0193 |
5.Silicon carbide bushing connection
- When flexible pipes are used to connect the installation pipes, the insertion lengths of the two ends of the flexible pipe sleeve must be adjusted symmetrically. Expansion gap should be based on local conditions or design department requirements.
- When using flange connection, the flange face must be flush with the end face of the composite pipe.
Technical Data Sheet of SiC Ceramic Bushing
| Item | Unit | Data |
| Max Working temperature | ℃ | 1380 |
| Density | g/cm³ | ≥3.02 |
| Porosity | % | <0.1% |
| Bending Strength | Mpa | 250(20℃) |
| Mpa | 280(1200℃) | |
| Modulus of elasticity | Gpa | 330(20℃) |
| Gpa | 300(1200℃) | |
| Thermal conductivity | W/m.k | 45(1200℃) |
| Coefficient of thermal expansion | K-1×10-6 | 4.5 |
| Rigidity | 13 | |
| Acid alkaline-proof | Excellent |
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