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Preparation method for TiC reinforced ultra-fine grain beta titanium and niobium based composite material

A composite material and ultra-fine grain technology, applied in the field of metal matrix composite materials, can solve the problems of uneven distribution of TiC, complicated process, high density, etc., and achieve the effect of uniform distribution of reinforcement, easy promotion, and high density

Active Publication Date: 2017-11-24
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The TiC reinforced titanium-based composite material prepared by this method has fine grains and high density. However, it is difficult to uniformly disperse nano-scale carbon nanotubes in tens of microns of titanium powder by ball milling. Therefore, the prepared TiC is very easy. There is an uneven distribution
The patent of Chen Yuyong et al. (CN201010178675.7) uses graphite powder as the carbon source of in-situ self-generated TiC, simply mixes graphite powder with titanium powder and other metal powders, and then cold-presses and induces smelting. In order to make the reinforcement evenly distributed, Two homogenization treatments, two forgings, one hot rolling, and two annealing treatments are also required. The process is complicated and the cost is high

Method used

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  • Preparation method for TiC reinforced ultra-fine grain beta titanium and niobium based composite material
  • Preparation method for TiC reinforced ultra-fine grain beta titanium and niobium based composite material
  • Preparation method for TiC reinforced ultra-fine grain beta titanium and niobium based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Raw materials: Ti powder and Nb powder are both 50μm irregular powders with a purity of more than 99.9%, CH 3 (CH 2 ) 16 COOH is analytically pure.

[0047] Proportion weighing: Ti powder: Nb powder is 60:40 by mass ratio, CH 3 (CH 2 ) 16 The amount of COOH added is 2wt% of the sum of the mass of Ti powder and Nb powder.

[0048] Alloying by high-energy ball milling: put the weighed raw materials in a 250ml stainless steel vacuum ball mill tank, use stainless steel balls with a diameter of 15mm for the grinding balls, the weight of the balls is 300g, the ball-to-material ratio is 15:1, and vacuum the ball mill tank. Put it in a planetary ball mill (QM-3SP2) and ball mill it at a speed of 240r / min for 12 hours to obtain a fully alloyed powder. Pre-firing: Put the alloy powder obtained by ball milling into a porcelain crucible, place it in a high-vacuum vertical sintering furnace (ZM-30-16), and evacuate to a vacuum degree of 5×10 - 2 Pa, at a heating rate of 5 °C...

Embodiment 2

[0053] Raw materials: Ti powder and Nb powder are both 60μm irregular powders with a purity of more than 99.9%, CH 3 (CH 2 ) 16 COOH is analytically pure.

[0054] Proportion weighing: Ti powder: Nb powder is 67:33 by mass ratio, CH 3 (CH 2 ) 16 The amount of COOH added is 2.5wt% of the sum of the mass of Ti powder and Nb powder.

[0055] Alloying by high-energy ball milling: put the weighed raw materials in a 250ml stainless steel vacuum ball mill tank, use stainless steel balls with a diameter of 10mm for the grinding balls, weigh 300g, and have a ball-to-material ratio of 12:1. Put it in a planetary ball mill (QM-3SP2) and ball mill it at a speed of 220r / min for 10 hours to obtain a fully alloyed powder.

[0056] Pre-firing: Put the alloy powder obtained by ball milling into a porcelain crucible, place it in a high-vacuum vertical sintering furnace (ZM-30-16), and evacuate to a vacuum degree of 5×10 -3 Pa, at a heating rate of 6°C / min, heat preservation at 450°C for ...

Embodiment 3

[0061] Raw materials: Ti powder and Nb powder are both 75 μm irregular powders with a purity of over 99.9%, and the alcohol is analytically pure.

[0062] Proportion weighing: Ti powder: Nb powder is calculated as 68; 32 by mass ratio, and the amount of alcohol added is 2.5wt% of the sum of the mass of Ti powder and Nb powder.

[0063] Alloying by high-energy ball milling: put the weighed raw materials in a 250ml stainless steel vacuum ball mill tank, use stainless steel balls with a diameter of 15mm for the grinding balls, the weight of the balls is 300g, the ball-to-material ratio is 10:1, and vacuum the ball mill tank. Put it in a planetary ball mill (QM-3SP2) and ball mill it at a speed of 200r / min for 10 hours to obtain a fully alloyed powder.

[0064] Pre-firing: Put the alloy powder obtained by ball milling into a porcelain crucible, place it in a high-vacuum vertical sintering furnace (ZM-30-16), and evacuate to a vacuum degree of 1×10 -2 Pa, with a heating rate of 8 ...

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Abstract

The invention discloses a preparation method for a TiC reinforced ultra-fine grain beta titanium and niobium based composite material. According to the preparation method, pure Ti powder and pure Nb powder serve as raw materials, a carbon and hydrogen containing process control agent serves as a carbon source for in-situ synthetic TiC and a process control agent, alloy powder is obtained through ball milling, the alloy powder is subjected to vacuum pre-sintering to remove gas and stress, then, the alloy powder is prepared into green bodies, units are subjected to assembling and sintering, and finally the TiC reinforced ultra-fine grain beta titanium and niobium based composite material is obtained through high-temperature ultrahigh pressure sintering. According to the preparation method, the process control agent serves as the carbon source for in-situ synthetic TiC, powder agglomeration and ball sticking and wall sticking situations in the ball-milling process are effectively relieved, the process control agent plays a role in refining the powder and increasing the powder yield, meanwhile TiC generated through low-temperature pre-burning is combined with high-temperature ultrahigh pressure sintering, the growth of grains is effectively restrained, the prepared TiC reinforced ultra-fine grain beta titanium and niobium based composite material is uniform in reinforcement body, fine in grain and high in density and meanwhile has the beneficial effects of being high in strength and plasticity and resistant to abrasion.

Description

technical field [0001] The invention belongs to the technical field of metal-based composite materials, and in particular relates to a method for preparing TiC-reinforced ultrafine-grained β-titanium-niobium-based composite materials. Background technique [0002] Titanium and titanium alloys have excellent properties of low density, high specific strength, corrosion resistance, high and low temperature resistance, and non-toxicity, and are widely used in aerospace, machinery, medical and other fields. Among them, β-titanium alloy has been widely studied because of its good plasticity, outstanding cold formability, and excellent corrosion resistance. Further improving the properties of titanium and titanium alloys, such as strength and wear resistance, will not only greatly promote their application, but also greatly reduce the weight of aircraft and automobiles and reduce energy consumption in the context of increasingly energy-constrained. Nanocrystalline / ultrafine-crysta...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C1/10B22F3/10
CPCB22F3/1007B22F2201/20C22C1/0458C22C1/1084
Inventor 林建国刘喆张德闯
Owner XIANGTAN UNIV
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