A thin filamentous metal iridium processing material. Iridium wire resistance coefficient is 6.03 x 10-2 Ω was/m, the tensile strength of 1493 mpa, the elongation is 10% ~ 20%. By powder metallurgy method and fused cast - pressure processing method can produce 0.15 mm Ф filaments. Iridium wire is used as high temperature antioxidant thermocouple material and filament material. Ir - W thermocouple E2200 ℃ = 44.19 mv, within the scope of the 1000 ~ 2000 ℃, the relationship between thermoelectric potential and temperature almost in a straight line, but can only be used in the neutral atmosphere or vacuum.
Iridium alloy: an alloy based on iridium and containing other elements.
The commonly used iridium alloys are ir-40rh, ir-70rh, ir-20ru, ir-10ru and other alloys.
Its main characteristics are good thermoelectric performance, high temperature oxidation and corrosion resistance. Ir-ru alloys are hard and brittle and difficult to process.
Iridium alloy is mainly used as high temperature oxidation resistance thermocouple and electrical contact materials, the use of Ir - Rh in thermocouple temperature can be as high as above 2000 ℃.
Iridium rhodium alloy: it is a binary alloy of iridium and rhodium. It is a continuous solid solution at high temperature, including IrRhl0, IrRh40, IrRh50 and IrRh. 70 alloy. Vickers hardness of ir-rh40 alloy is l736MPa, while that of IrPh70 is 1422MPa. High temperature oxidation resistance of alloy is better than pure iridium, at 2000 ℃ IrRh60 oxidation weight loss of about 5%. Pure iridium lost as much as 27 percent of its weight. Using high frequency furnace argon gas protection smelting, casting ingot through hot rolling and a moderate amount of cold processing into the material. Mainly used as high temperature oxidation resistance thermocouple, temperature can reach 2000 ℃ or above, have IrRh60 - Ir, IrRh40 - Ir and IrRh50 - IrRu10 etc., the latter thermoelectric power, the highest at 2000 ℃ can be up to 17.18 mV.
The dual alloy of iridium and rhodium, which is a continuous solid solution at high temperature, includes IrRhl0, IrRh40, IrRh50 and IrRh. 70 alloy. Vickers hardness of ir-rh40 alloy is l736MPa, while that of IrPh70 is 1422MPa. High temperature oxidation resistance of alloy is better than pure iridium, at 2000 ℃ IrRh60 oxidation weight loss of about 5%. Pure iridium lost as much as 27 percent of its weight. Using high frequency furnace argon gas protection smelting, casting ingot through hot rolling and a moderate amount of cold processing into the material. Mainly used as high temperature oxidation resistance thermocouple, temperature can reach 2000 ℃ or above, have IrRh60 - Ir, IrRh40 - Ir and IrRh50 - IrRu10 etc., the latter thermoelectric power, the highest at 2000 ℃ can be up to 17.18 mV.
A block of iridium metal is not biologically useful or harmful because it does not react with biological tissue. The proportion of iridium in human tissue is only about 20 parts per trillion. Like most metals, iridium's fine metal powder is dangerous. The powder stimulates the tissue and burns easily in the air. Because iridium compounds are generally treated in low quantities, little is known about their toxicity. But iridium's soluble salts, such as iridium halides, are toxic. Most iridium compounds are insoluble and therefore difficult to absorb.
Ir isotopes are as dangerous as other radioisotopes. The only related accident was accidental exposure to the isotope during close treatment. High - energy gamma radiation from Ir increases the risk of cancer. External exposure can lead to burns, radiation poisoning and even death. Ingestion of Ir can lead to endometrial burn. The Ir, Ir and Ir that enter the body are mainly accumulated in the liver, and the gamma rays and radiation emitted by them will cause harm to the body.
