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Preparing method of high-temperature antioxidant fastener and antioxidant material

A high-temperature anti-oxidation and anti-oxidation technology, applied in metal material coating process, ion implantation plating, coating and other directions, can solve the problems of high brittleness, high cost, insufficient high temperature strength, etc. The effect of long life and low cost

Inactive Publication Date: 2014-12-10
NINGXIA ORIENT TANTALUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ceramics have good temperature resistance and oxidation resistance, but poor processing performance, it is very difficult to prepare fasteners, and due to factors such as high brittleness and insufficient shear strength, they can only be used in very special environments
Precious metals have better oxidation resistance, but insufficient high temperature strength, and the cost is too expensive
There are great limitations and difficulties in the preparation and application of these two types of fasteners
[0004] Based on the above discussion, it can be found that due to the joint influence of machinability, working temperature, high temperature strength, price and other factors, there is currently a lack of fasteners that can be used in high temperature oxidation and corrosion environments above 1200 °C in China.

Method used

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  • Preparing method of high-temperature antioxidant fastener and antioxidant material
  • Preparing method of high-temperature antioxidant fastener and antioxidant material
  • Preparing method of high-temperature antioxidant fastener and antioxidant material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] High-temperature anti-oxidation materials contain the following components by weight percentage:

[0027] Cr is 3%, Ti is 7%, Mo is 12%, Y 2 o 3 2.5%, Al 2 o 3 5.5%, B 4 C is 0.8%, NaF is 0.2%, and the balance is Si.

[0028] 1) Fully mix the above powder with a particle size of 250 mesh, add PEG of 0.25Wt% of the powder as a binder, add ethanol twice the volume of the powder as a carrier, and ball mill at 230 rpm for 8 hours to prepare an antioxidant slurry material;

[0029] 2) The extruded ingot of φ125㎜ niobium-tungsten alloy (5%W-2%Mo-1%Zr, the balance is niobium) is forged four times to φ8.0 ＋0.1 mm (the bar needs to be pickled, annealed, sawed, etc. after each forging), and then made into φ8 after straightening, surface cleaning, polishing and vacuum annealing ±0.1 mm niobium tungsten alloy rod;

[0030] 3) Put φ8 ±0.1 The mm niobium-tungsten alloy bar is cold-forged to form a hexagonal head according to the conventional process, and then the niobium-tun...

Embodiment 2

[0037] High-temperature anti-oxidation materials contain the following components by weight percentage:

[0038] Si is 65%, Cr is 3%, Ti is 8%, Mo is 12%, Al2 o 3 5%, Y 2 o 3 3% for S, 2% for S, 0.3% for NaF, and 1.7% for V.

[0039] 1) Fully mix the above powder with a particle size of 250 mesh, add 0.25wt% PEG as a binder, add ethanol twice the volume of the powder as a carrier, and ball mill at 350 rpm for 8 hours to prepare an anti-oxidation slurry. The slurry was vacuum-dried and then ground and dispersed at a speed of 120 rpm for 2 hours to make an investment;

[0040] 2) The φ113㎜tantalum ten-tungsten alloy (10%W, the balance is Ta) ingot was forged 5 times to φ8.0 ＋0.1 mm, after each forging, pickling, annealing, sawing and other operations are required for the bar, and then it is made into φ8 after straightening, surface cleaning, polishing and vacuum annealing ±0.1 mm tantalum ten tungsten rod;

[0041] 3) Use the thread rolling machine according to the convent...

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Abstract

The invention relates to a preparing method of a high-temperature antioxidant fastener and to an antioxidant material. The fastener can be used in a high-temperature oxidant corrosive environment, for example, the fastener can be used for connection and fastening of high-temperature structure components in the industries of aviation, aerospace, steel, glass fiber, and the like. The antioxidant material is characterized by comprising following components by weight: 1.3-3% of Cr, 4-11% of Ti, 2-14% of Mo, 3-6% of Al2O3, 2.3-4.5% of Y2O3, and at least one of following four components comprising 1.4-2% of S, 0.5-1.2% of B4C, 0.2-0.40% of NaF and 0.5-3% of V, with the balance being Si. A refractory metal and an alloy thereof are adopted as materials for a green body of the fastener in the preparing method. The materials have plasticity and machinability, and are convenient to machine into fasteners of various sizes. The high-temperature strength of the materials is much higher than that of high-temperature alloys used at present so that the using temperature of the fastener is largely improved.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature anti-oxidation fastener and an anti-oxidation material. The fastener can be used in high-temperature oxidation and corrosion environments, such as the connection and fastening of high-temperature structural parts in industries such as aviation, aerospace, steel, and glass fiber. solid. Background technique [0002] Aerospace, aerospace vehicle engines, structural parts, and control and regulation functional units require a variety of fasteners of different specifications. These fasteners will be exposed to high temperature and aerobic environment when they work, so they are required to have performance characteristics such as low density, good mechanical properties and good oxidation resistance. As the flight speed of aircraft continues to increase, the requirements for the operating temperature of fasteners are also increasing. The requirements for the working temperature of the fast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/18C22C1/02C23C14/06
Inventor 赵刚周小军于永祥罗文王立斐张静
Owner NINGXIA ORIENT TANTALUM IND
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