English name: Polybenzimidazoles, abbreviation: PBI. PBI is one of the best engineering plastics machinings with very high performance in the industry at present, and it is equivalent grade to PI, PAI,. When the temperature rises to or even exceeds 205°C, among all engineering plastics, PBI has the highest heat resistance and excellent mechanical properties. Compared with other types of engineering plastic machined products, it has better load-bearing capacity, wear resistance, and strength even under extreme temperatures.
Ultra-wide temperature application range:
In the high temperature, PBI parts processing can withstand the high temperature of 427℃, and withstand the short-term high-temperature test of 760℃. At low temperatures, PBI parts processing can keep its various properties stable at a temperature of minus 160°C.
1. It can maintain excellent mechanical properties, such as stiffness, strength, hardness, creep resistance, etc., in a fairly wide temperature range.
2. Excellent wear resistance and friction performance. Because of this characteristic, in recent years, aircraft engines have directly used PBI materials to make contactors, which greatly improves the safety factor of aircraft engines. Moreover, the service life of contactors made of PBI is very long, there is no need for constant maintenance and replacement during use, which greatly reduces the accident rate of the aircraft in this regard.
3. In the anti-radiation performance test, we found that even under the super-strong radiation of high-energy gamma rays and X-rays, the PBI material still maintains a very stable state.
4. The PBI material has good electrical insulation properties, can prevent static electricity, and will not generate static electricity during the use of the product, which can ensure the stability of the product.
Because PBI’s special material characteristics determine its processing characteristics. PBI has high hardness and high wear resistance. PlasticPartsCustom has developed the most reasonable processing plan based on the physical and chemical properties of PBI:
1. First, when CNC machining PBI, the tool movement speed should not be too fast to prevent chipping and breaking. In addition, when CNC machining is performing, a sharp tool must be selected. If the tool wears due to long processing time, The tool must be replaced in time to prevent the size of the processed product from changing due to the wear of the tool.
2. In machining, the choice of tools is undoubtedly a very key factor in determining product quality. For PBI CNC machining parts, the quality and choice of tools are more important. For some products, we will add diamond coating to the tools. In this way, the precision and tolerance requirements of PBI parts processing are guaranteed during processing.
3. Compared with most engineering plastics of the same level, PBI is the hardest material. When we perform CNC machining, we will definitely choose high-quality cutting fluids, which have good cleaning, rust prevention, lubrication, and cooling performance, and It must not produce precipitation or stratification during use and must have good stability.
4. In view of the poor toughness of PBI, common processing methods often have chipping and cracking. After years of exploration, we have found the most suitable feeding and cutting amount for PBI parts processing, and We will add chamfers to the sharp edges. Our engineering department writes a set of processes and precautions for PBI CNC machining into a copy and be saved in the company base. When processing PBI, engineers can learn from it and perform the most reasonable programming.
5. PBI parts CNC machining, and milling generally damages the tools greatly. During production, PlasticPartsCustom engineers will check whether the processing tools are worn from time to time. If there is wear that affects the accuracy of the parts, we will immediately replace the tools to ensure that all the processed parts are in High precision requirements.
6. Due to the limited ability of PBI products to withstand high-temperature steam, all our CNC machining PBI parts are currently strictly tested by the QC department, and our packaging department will immediately pack them in a vacuum strictly and then transport them to customers.
7. The advantages of PBI parts are obvious. For example, their working life is generally very long, and there is almost no need for regular maintenance, repair, and replacement, so the intermediate consumables and maintenance costs are greatly reduced. In addition, the extremely excellent physical and chemical properties also determine that PBI parts are used in some high-end industries with high added value, but their shortcomings are also obvious. The cost of the material itself is very high, Besides material cost. The processing cost and the consumption of processing tools are also higher than other engineering plastics. Therefore, the overall CNC machining cost of PBI parts is very high.
8. At present, most of the PBI parts produced by LELAND Technology are widely used in high-end aerospace parts and precision parts in semiconductor equipment.
