Ti/Al2O3 composite material for wave impedance gradient flying plate and manufacture thereof

A composite material and wave impedance technology, which is applied in the field of Ti/Al2O3 composite materials, can solve the problem of in-depth research on flyers with limited wave impedance gradients, low mechanical strength of the transition layer, and difficulty in ensuring the integrity of flyer quasi-isentropic compressibility during supersonic flight To achieve the effect of tight interface, high density and complete structure

Inactive Publication Date: 2009-01-07
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the W-Mo-Ti-Al system, because the metal Al or Mg at the low-density end of the gradient flyer easily forms a brittle intermetallic compound with Ti, the mechanical strength of the intermediate transition layer of the flyer material is low, and it is difficult to ensure that the flyer Produces good quasi-isentropic compressibility and integrity during supersonic flight, which limits the in-depth study of wave impedance gradient flyers in W-Mo-Ti-Al system

Method used

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  • Ti/Al2O3 composite material for wave impedance gradient flying plate and manufacture thereof
  • Ti/Al2O3 composite material for wave impedance gradient flying plate and manufacture thereof
  • Ti/Al2O3 composite material for wave impedance gradient flying plate and manufacture thereof

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Effect test

Embodiment 1

[0023] Ti / Al for wave impedance gradient flyer according to the embodiment of the present invention 2 o 3 The composite material is composed of the following raw materials in weight percentage: Ti is 57.9%, α-Al 2 o 3 40.7% and Nb 1.4%. Table 1 shows the composition distribution of materials when P=0.8 and 11 layers. Ti and Al in the table 2 o 3 The content is volume percentage, with Ti and Al 2 o 3 The total volume of is 100%, and Nb is added according to the Ti content. (the same below)

[0024]

[0025] After the powders of each layer were weighed in proportion, they were mixed separately for 48 hours, and the materials of each layer were pressure-formed, and the thickness of each single-layer bad body was 1.5mm. The formed single-layer blanks were put into graphite molds in the order of decreasing Ti content (high Ti content at the bottom), and then prepared Ti by spark plasma sintering (SPS for short). / Al 2 o 3 For the composite material, the sintering pro...

Embodiment 2

[0028] Ti / Al used for wave impedance gradient flyer of the present invention 2 o 3 The composite material is composed of the following raw materials in weight percentage: Ti is 62.5%, α-Al 2 o 3 36.2% and Nb 1.3%. Table 1 shows the composition distribution of materials when P=0.6 and 6 layers.

[0029]

[0030] After the powders of each layer are weighed in proportion, the materials are mixed separately for 48 hours, and the materials of each layer are formed by pressure, and the thickness of each single-layer bad body is 2mm. The formed single-layer blanks are put into graphite molds in the order of decreasing Ti content (high Ti content is at the bottom), and then prepared by spark plasma sintering (SPS for short). Ti / Al on Flyer with Wave Impedance Gradient 2 o 3 For the composite material, the sintering process is as follows: sintering temperature is 1200°C, holding time is 20min, and heating rate is 150°C / min. The density of the prepared material is 96.8%, the i...

Embodiment 3

[0032] Ti / Al used for wave impedance gradient flyer of the present invention 2 o 3 The composite material is composed of the following raw materials in weight percentage: Ti is 48.7%, α-Al 2 o 3 50.2% and Nb 1.1%. Table 1 shows the composition distribution of materials when P=1.2 and 14 layers.

[0033]

[0034] After the powders of each layer were weighed in proportion, the materials were mixed separately for 48 hours, and the materials of each layer were pressure-formed, and the thickness of each single-layer bad body was 1mm. The formed single-layer blanks were put into the graphite mold in the order of decreasing Ti content (the one with the highest Ti content at the bottom), and then the Ti was prepared by spark plasma sintering (SPS for short). / Al 2 o 3 For the composite material, the sintering process is as follows: sintering temperature is 1400°C, holding time is 8min, and heating rate is 250°C / min. The density of the prepared material is 97.6%, the interfac...

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Abstract

The present invention relates to one kind of gradient Ti / Al2O3 composite material for the intermediate layer of wave impedance flying plate. The gradient composite material is produced through the steps of mixing material, pressure forming, setting the gradient material inside graphite mold and fast plasma discharge sintering. The material contains Ti in 45-69 wt%, alpha-Al2O3 in 30-50 wt%, and Nb in 0.5-5 wt%. In the gradient material, Ti content is decreased gradiently from maximum value to zero, alpha-Al2O3 content is increased from zero to maximum, and Nb content is decreased, with the Ni content in both the top and bottom layers being zero. The composite material of the present invention has tightly combined interface, integral structure, high compactness, wave impedance distribution index of 2-3, capacity of obtaining good quasi-isoentropic compression waveform, excellent weldability and other advantages.

Description

(1) Technical field [0001] The present invention relates to a kind of Ti / Al used for wave impedance gradient flyer 2 o 3 A composite material, in particular to a material for an intermediate transition layer of a wave impedance gradient flyer, and a method for preparing the composite material. (2) Background technology [0002] Functionally graded materials (Functionally Graded Materials; FGM) refer to a new heterogeneous composite material in which the composition and structure of the material change continuously from one side to the other in a gradient, so that the properties and functions of the material also change in a gradient. With the rapid development and rapid advancement of science and technology, higher, stricter and more requirements are put forward for the performance of materials. The concept of FGM was originally proposed to solve many problems in the thermal protection system of the new generation of shuttles, such as its heat resistance, heat insulation, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00C22C45/10C22C1/05B22F3/16
Inventor 王志史国普许坤张联盟
Owner UNIV OF JINAN
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