Platinum-iridium alloys are widely used in modern industry and technology. Medium temperature thermocouple material, thick film resistors, precision instrument hairspring, standard resistance and Jordan farmar, dental materials and needle (1) meter material: they are a classic elv contact with conductive ring, highly reliable ignition engine materials, all kinds of precision instruments, sensors and micromotor with potentiometer winding and a silk materials, microelectronics technology in thick film resistance materials, etc. (2) Electrode materials in chlor-alkali electrolysis industry. (3) Dental materials and other medical materials. (4) Standard resistors, weights and meter sticks. (5)PtIr1O alloy and AuPd40 alloy can be paired as a medium temperature thermocouple, which is affected by iridium volatilization loss. In fact, platinum-iridium alloys with high iridium content are not suitable for long-term use at high temperatures. Alloys widely used in industry generally contain less than 30 percent iridium. PtIr5 and PtIr1O are classic potentiometer winding materials, PtIr17.5 is brush material, and PtIr25 is high reliable aero engine ignition contact material. Platinum-iridium alloy has been replaced by many gold base alloys as winding material and brush material, but PtIr25 alloy has never been a reliable replacement material.
At present, electrochemical treatment electrode can be divided into two types: pure platinum electrode, which has high cost and poor mechanical strength; The other is platinum-coated electrode, which has poor corrosion resistance and short service life. Platinum-based binary alloy containing rhodium, a continuous solid solution at high temperature. Rhodium can improve the thermoelectric potential, oxidation resistance and acid corrosion resistance of platinum alloy. PtRh5, PtRhl0, PtRhl3, PtRh30 and PtRh40 alloys are available. Alloys greater than 20% Rh do not dissolve in aqua regia. Argon shielded melting in a high frequency or intermediate frequency furnace. All alloys under 20% Rh can be cold-processed into materials; Alloys greater than 20% Rh are made of hot and cold processed materials; PtRh70 alloy is made of heat - processed materials. Mainly used as thermocouple material, PtRhl0/Pt, PtRh13/Pt isothermic couple. Also used as catalyst, crucible and nozzle, high temperature heater, electrical contact and spark plug electrode. Winding material.
Platinum-iridium alloy has high chemical stability, excellent mechanical and electrical properties, high temperature resistance, high catalytic activity, and is widely used in transportation, biomedical, energy, chemical and other fields. The status quo of the application of Platinum-Iridium alloys in electrical contact materials, spark plug electrodes, biomedicine, catalysts and other typical fields was reviewed, and the future development of pT-iridium alloys was prospected.
