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Mosten Alloy Co., Ltd.

Tungsten Fiber Reinforced Composite Material

  • Mosten
  • 29 Aug

The fiber-reinforced composite has been remarkable in the material industry because of the extremely high strength of the fibers or whiskers of any material. The tungsten whiskers having a diameter of 3 to 8. m u.m have an ultimate tensile strength of up to 28 120 MPa, however, because of the difficulties in the production of whiskers, the conventional tungsten fiber reinforced composite material is a tensile tungsten wire with a diameter of 0.076 to 0.178 mm as the reinforcing agent. The tungsten wire may be a full length (continuous fiber) that extends through the composite material, or a cut or cut tungsten wire (discontinuous) may also be used. In the tungsten fiber reinforced composite, it is first to be considered that the matrix can be bonded well with the fiber and does not produce a reaction to attenuate the performance of the fiber, and the tungsten fiber may be a pure tungsten wire or a tungsten alloy wire, as desired. The invention relates to a composite material system taking Nb-42Ti-4Cr-4A1-1V as a matrix and W-3Re as a fiber, and is used for gas turbine blades with a temperature above 1 093 DEG C. In the coating state,27% of the fiber-reinforced composite material had excellent durability (100 h breaking strength of 176 MPa at l 204 ℃), high-temperature tensile strength (232 MPa at 1 427 ℃), and isothermal oxidation life (more than 1 100 h at 1 093 ℃). A composite material with Ni-Cr or Ni-Cr-Al alloy as a matrix and W-Re-Hf-c alloy as a reinforcing agent has a particularly high heat strength, and is still 370 MPa after being subjected to 100 h at l 100.degree. C. The composite material reinforced with W-ThO2 wire with a diameter of 0.76 mm is used to treat the cobalt alloy MAP-M-322 as the base, and the lasting strength at the temperature of 1 093 DEG C is 6 times higher than that of the best industrial cobalt alloy, and the 100-h strength at the temperature is 210MPa. In recent years, the tungsten fiber reinforced superalloy composite material has been developed rapidly, and the material has excellent high-temperature strength and creep resistance, and the use temperature is about 175 DEG C higher than that of a conventional superalloy, and can be used as a high-temperature component such as a turbine blade of a rocket engine, Is a promising high-temperature material. The tungsten alloy fiber has a ultimate tensile strength of 165 MPa at the temperature of 1 095 DEG C, a creep rupture strength of 100 h can be up to 1 400 MPa, and the most hard superalloy is only 90. with a 40% (volume fraction) tungsten fiber-reinforced superalloy, at 1 095 c, its 100h breaking strength can be up to 345 mpo in the creep performance test, the superalloy reinforced by the tungsten fiber significantly reduces the creep rate of the second stage under a given pressure condition, This is very advantageous for the use of turbine blades. The high temperature gas turbine blade material has certain high cycle fatigue, low cycle fatigue and thermal fatigue strength to resist periodic stress and strain. When the temperature is 700 to 1,000%, the high-cycle fatigue strength of the tungsten fiber-reinforced superalloy composite material is obviously higher than that of the super-alloy, and has the similar advantages in low-cycle fatigue performance. In addition, the temperature gradient formed by rapid heating and cooling within the gas turbine results in thermal stress and strain of the material, while the tungsten fiber-reinforced superalloy composite is successfully subjected to 1,000 thermal cycles (in the range of 30-1 200 & deg; C) without any structural damage and performance degradation.

Tags :
tungsten