PTFE 特种复合材料
特种复合材料是标准"G"系列复合材料的补充。由于高科技工业应用对解决方案的需求不断增长，Guarniflon® 特种复合材料正获得越来越大的市场份额。
相关表格展示了Guarniflon® 部分特种"G"系列复合材料的性能，这些仅代表Guarniflon® 能够提供的复合材料范围中的一小部分。Guarniflon® 的部分复合材料含有PEEK、PPS、聚酰亚胺、LCP、二硫化钼等填料。
相关表格展示了Guarniflon® 部分特种"G"系列复合材料的性能，这些仅代表Guarniflon® 能够提供的复合材料范围中的一小部分。Guarniflon® 的部分复合材料含有PEEK、PPS、聚酰亚胺、LCP、二硫化钼等填料。
可供选择的特种复合材料
除纯PTFE G400产品外，GUARNIFLON® 还提供多种复合材料产品。这些复合材料直接在Guarniflon® 复合单元中以精选聚合物和特种高纯填料为原料加工而成，终端用户可从中找到满足其技术要求的解决方案。
为便于选择，以下表格总结了：
为便于选择，以下表格总结了：
- 单一填料与性能及常见用途之间的关联
- 最常见标准和特种复合材料的性能
| Filler | Property | Most common applications |
|---|---|---|
| Glass | Enhanced wear resistance. Enhanced chemical resistance (except for alkali and hydrofluoric acid). | Valve seats, seals, bearings, requested to resist sliding and chemicals. Suitable for bearings working at low PV values. |
| Graphite | Extremely low coefficient of friction. Fairly good compressive strength. Good wear resistance. | Bearings for high speed on fairly hard surface. |
| Carbon | Good thermal conductivity. Good resistance to deformation. | Valve seats. Bearings for high speed and when fast dissipation of electric charges is needed. Elastic bands for unlubricated compressors. |
| Molibdenum disulphide | Enhanced non-stick properties. Low static coefficient of friction. Fairly good resistance to deformation. | Guide bands. Details needing good resistivity. |
| Bronze | Enhanced compressive strength. Good wear resistance and high thermal conductivity. | Anti-extrusion rings. Unlubricated bearings for high speed on not hard surface. |
Guarniflon® 可提供极为广泛的纯PTFE及G系列复合PTFE削切胶带、板材、挤压和模压棒材及管材。尺寸及相关公差包含在尺寸手册中。胶带、板材和成品可提供蚀刻处理。
主要性能 | 模压
| Property | Test method | Unit | G Special Compounds | ||||||
|---|---|---|---|---|---|---|---|---|---|
| G416 40% BRONZE 2% CARBON | G418 15% GLASS FIBER 5% MOS2 | G420 50% STEEL | G427 40% BRONZE 5% MOS2 | G436 3% MOS2 | G455 35% CARBOGRAPHITE | G456 25% HARD CARBON | |||
| MOULDED | |||||||||
| Specific gravity | ASTM D792 | g/cm3 | 2.98 - 3.16 | 2.20 - 2.30 | 3.25 - 3.35 | 3.15 - 3.25 | 2.18 - 2.24 | 1.90 - 2.00 | 2.05 - 2.11 |
| Coefficient of linear thermal expansion 25-100 °C | ASTM D696 | 10-5 (mm/mm)/°C | 8 - 11 | 9 - 12 | 10 - 12 | 9 - 12 | 11 - 12 | 6.5 - 10 | 8 - 11 |
| Hardness Shore D | ASTM D2240 | Punti | ≥ 58 | ≥ 55 | ≥ 65 | ≥ 60 | ≥ 50 | ≥ 65 | ≥ 62 |
| Tensile strength | ISO 527 v=50mm/min | N/mm2 | ≥ 20 | ≥ 18 | ≥ 17 | ≥ 20 | ≥ 23 | ≥ 8 | ≥ 12 |
| Elongation at break | ISO 527 v=50mm/min | % | ≥ 220 | ≥ 230 | ≥ 180 | ≥ 200 | ≥ 230 | ≥ 40 | ≥ 70 |
| Compressive strength at 1% deformation | ASTM D695 | N/mm2 | 8-10 | 8-9 | 10 - 10.5 | 6.5 - 8 | 5.5 - 6.5 | 12 - 13.5 | 7 - 11 |
| Deformation under load (24 h 13.7 N/mm2 23°C | ASTM D621 | % | ≤ 8 | ≤ 8 | ≤ 6.5 | ≤ 7.5 | ≤ 14 | ≤ 6 | ≤ 5.5 |
| Permanent deformation (as above after 24 hdi relaxation) | ASTM D621 | % | ≤ 5 | ≤ 4 | ≤ 3 | ≤ 3.5 | ≤ 6 | ≤ 1.5 | ≤ 1.9 |
| Kinetic coefficient of friction | ASTM D1894 | / | 0.13 | 0.08 | 0.13 | 0.13 | 0.08 | 0.12 | 0.12 |
| Wear factor at PV 100 | ASTM D3702 | 9 - 13 | 10 - 20 | 20 - 30 | 10 - 15 | 3.000 | 20 - 30 | 12 - 18 |
设计用重要性能
与PTFE混合的填料可改善纯聚合物的某些基本物理性能，优势如下：
- 增强抗压强度
- 提高导热性
- 减少热膨胀
- 降低磨损系数
机械性能
谈及材料机械性能时，抗拉强度和断裂伸长率通常是首要关注的指标。然而，这两个最常见的性能并不总能准确反映材料在某些应用中的实际表现，而抗压性能实际上才是最重要的指标。我们重点关注在设定变形量下的抗压强度、恒定载荷下的变形量以及在设定温度下的永久变形。