7 results about "Phase stability" patented technology

The invention provides a high-entropy oxide ceramic material as well as a preparation method and application thereof. The chemical composition of the high-entropy oxide ceramic material is (Y < 0.25-0.25 > x < Ho > < 0.25-0.25 > x < Er < 0.25-0.25 > x < Yb > < 0.25-0.25 > x < Hfx >) < 2 + x, 0 lt >, x < lt >; 1. HfO2 is doped in the rare earth oxide (Y0. 25Ho0. 25Er0. 25Yb0. 25) 2O3, so that the thermal conductivity (2.6-3.0 W.m <-1 >. K <-1 > at room temperature) of the material is reduced, the material has low thermal expansion coefficient (7.8-8.0 * 10 <-6 > K <-1 > in the range of 300-900 DEG C) and excellent high-temperature phase stability (no phase change after annealing for 100 hours at the temperature of 1600 DEG C), and due to the characteristics, the material can meet the service requirement of a surface layer of a thermal / environmental barrier coating.

This invention provides a high-entropy oxide ceramic material, its preparation method, and its application. The chemical composition of the high-entropy oxide ceramic material is (Y0...). 0.25‑0.25x Ho 0.25‑0.25x Er 0.25‑ 0.25x Yb 0.25‑0.25x Hf x )2O 3+x ,0< x <1. This invention utilizes rare earth oxides (Y) 0.25 Ho 0.25 Er 0.25 Yb 0.25 Doping HfO2 into O2O3 reduces the thermal conductivity of the material (2.6~3.0 W·m at room temperature). ‑1 ·K ‑1 At the same time, it has a low coefficient of thermal expansion (7.8~8.0×10⁻⁶ in the range of 300~900℃). ‑6 K ‑1 Its excellent high-temperature phase stability (no phase change after annealing at 1600℃ for 100 hours) and other characteristics enable it to meet the service requirements of thermal / environmental barrier coatings.

The Ni-Cr-Mo-N alloy of the present application contains, in mass%, Ni: 22.0% or more, Cr: 22.0% or more, Mo: 5.0% or more, N: 0.180% or more, Si, Al, Mn, the balance consisting of Fe and inevitable impurities, satisfies the following formulas (1) to (3), and in the cross-sectional structure after holding at 950°C for 30 minutes, the area ratio of the phase determined by EBSD is 1.0% or less. σ The Ni-Cr-Mo-N alloy of the present application has excellent corrosion resistance even in the case of exposure to a temperature range of 700 to 1000°C like precipitation σ of the phase. Cr + 3.3 x Mo + 16 x N ≥ 43.0 … (1) 7.3 x Mo - Ni ≤ 21.0 … (2-1) 1.3 x Cr - Ni ≤ 5.7 … (2-2) 1.6 x Si + 0.99 x Mn + 2.2 x Al ≤ 0.95 … (3)

A highly corrosion-resistant Ni—Cr Mo—N alloy including in weight %, Ni: 22.0% or more, Cr: 22.0% or more, Mo: 5.0% or more, N: 0.180% or more, Si, Al, Mn, Fe as a remainder, and inevitable impurities, wherein the composition satisfies the following Formulas (1) to (3), and an area ratio of a sigma phase in a cross-sectional structure measured by EBSD after holding at 950° C. for 30 minutes is 1.0% or lessCr+3.3×Mo+16×N≥43.0  (1)7.3×Mo—Ni≤21.0  (2-1)1.3×Cr—Ni≤5.7  (2-2)1.6×Si+0.99×Mn+2.2×Al≤0.95  (3).

This invention provides a multi-rare-earth modified zirconia ceramic material, its preparation method, and its application. The chemical composition of the multi-rare-earth modified zirconia ceramic material is La. x Ce y Gd z Yb s Y t Zr 1‑x‑y‑z‑s‑t O δ , where 0 < x <1;0< y <1;0< z <1;0< s <1;0< t <1;0<1- x - y - z - s - t <1;0< δ <2. This material possesses excellent high-temperature phase stability, high coefficient of thermal expansion, low thermal conductivity, and high fracture toughness, enabling it to meet the higher service temperature requirements of thermal barrier coatings.

The invention provides a nickel-based high-temperature alloy with high damage tolerance and high fatigue resistance and a manufacturing method, an alloy product and application thereof. The nickel-based high-temperature alloy comprises 8.0%-12.5% of Cr, 12.0%-16.5% of Co, 2.0%-4.0% of W, 3.0%-6.0% of Mo, 3.0%-6.0% of Al, 2.0%-4.0% of Ti, 2.0%-4.5% of Nb, 0.05%-2.0% of Hf, 0.05%-0.10% of C, 0.005%-0.015% of B, 0.1%-1.0% of Fe, 0.2%-1.0% of V, less than or equal to 0.005% of Sc, less than or equal to 0.05% of La, less than or equal to 0.05% of Mg, less than or equal to 0.02% of Ce, less than or equal to 3.0% of Re, less than or equal to The balance is Ni and inevitable impurities; the multiple technical barriers of high-volume-fraction gamma'phase stability control, grain boundary-precipitated phase synergistic strengthening, additive manufacturing defect suppression and the like are broken through, and the damage tolerance, the anti-fatigue performance and the high-temperature stability are improved.

The phase stability of recoverable polyol dispersions is improved by shearing the dispersions using rotors / stators or other suitable devices. After shearing, the recoverable polyol dispersion has a lower Lumisizer stability index (indicating improved phase stability). The improved storage stability results in easier storage, transportation and use of the recoverable polyol dispersion.