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Microwave sintering of superfine grain base titanium carbonitride

A technology of titanium carbonitride and ultrafine grains, which is applied in the field of microwave sintering of ultrafine grain titanium carbonitride-based cermets, which can solve the problems of long sintering and holding time, coarse material grains, and high energy consumption. , to achieve the effect of uniform and reliable heating, simple process and excellent performance

Inactive Publication Date: 2011-05-11
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The information disclosed in the above-mentioned public documents shows that those that really involve the material sintering process use conventional vacuum sintering or atmosphere protection sintering technical solutions, which have long sintering and holding time, high energy consumption, and easy to make material grains coarse, etc. defect

Method used

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  • Microwave sintering of superfine grain base titanium carbonitride
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  • Microwave sintering of superfine grain base titanium carbonitride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take a certain proportion of TiC 0.7 N 0.3 , WC, TaC, Co, Ni, Mo 2 C, ZrC, VC powder, according to the following mass ratio formulated into a mixture:

[0033] TiC 0.7 N 0.3 50.5wt% WC 15wt% TaC 10wt% Mo 2 C 8wt% Co 10wt% Ni 5wt% ZrC 1.0wt% VC 0.5wt%

[0034]The particle size of the powder of each of the above components is ≤1 μm.

[0035] Then the blank is made by powder metallurgy method, the process is:

[0036] (1) Wet grinding: Put the above mixed powder into the stainless steel ball mill tank of QM-1SP4 ball mill, add n-hexane at 200-400ml / l, select Φ5 hard alloy balls, the ball-to-material ratio is 5:1, and the speed is 200rpm , ball milling for 48 to 96 hours;

[0037] (2) Add molding agent: weigh paraffin wax by 3-5wt%, dissolve it in n-hexane, add ball mill tank and wet mill together with the mixture;

[0038] (3) Sieving: pass the ball milled slurry through a 60-mesh sieve, and settle for 1 to 2 hours;

[0039] (4) Drying: Put the precipitated mater...

Embodiment 2

[0050] Take a certain proportion of TiC 0.5 N 0.5 , WC, TaC, Co, Ni, Mo 2 C, ZrC, VC powder, according to the following mass ratio formulated into a mixture:

[0051] TiC 0.5 N 0.5 50.5wt% WC 15wt% TaC 10wt% Mo 2 C 8wt% Co 10wt% Ni 5wt% ZrC 1.0wt% VC 0.5wt%.

[0052] The particle size of the powder of each of the above components is ≤1 μm.

[0053] Then the blank is made by powder metallurgy technology, the process is:

[0054] (1) Wet grinding: put the above mixed powder into the stainless steel ball milling tank of QM-1SP4 ball mill, add n-hexane at 350ml / l, select Φ5 hard alloy balls, the ball-to-material ratio is 5:1, and the speed is 200rpm. 96 hours.

[0055] (2) Adding forming agent: weigh paraffin wax according to 5wt%, dissolve it in n-hexane, add ball mill jar and wet mill together with the mixture.

[0056] (3) Screening: pass the milled slurry through a 60-mesh sieve, and settle for 2 hours.

[0057] (4) Drying: Put the precipitated material into a ZK-82B...

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Abstract

The utility model provides microwave sintering of an ultra-fine grain titanium carbonitride group cermet. A 300MHz to 8GHz microwave frequency medium is used as a heat source to enable a billet of the ultra-fine grain titanium carbonitride group cermet to absorb microwave energy to complete the sintering process. During the sintering process, vacuum and atmosphere protection microwave heating andsintering techniques are adopted respectively according to the ratio of carbon to nitrogen of the billet of the ultra-fine grain carbon titanium nitride cermet. The 300MHz to 8GHz microwave frequencyis used to heat and sinter the billets of the titanium carbonitride group cermet with different ratio of carbon to nitrogen and vacuum microwave sintering and atmosphere protection microwave sintering technological proposals are used respectively for the billets of the titanium carbonitride group cermet with the different ratio of carbon to nitrogen, which overcomes the defects of the prior vacuum or atmosphere protection sintering techniques, such as low heating efficiency, long sintering time, large energy consumption, serious environment pollution and oversized grains, and the like. The microwave sintering can be widely applied to sintering other ceramics, ceramic matrix composites and intermetallic compound materials with stronger microwave absorbing capacity.

Description

technical field [0001] The invention relates to microwave sintering, in particular to microwave sintering of ultrafine grain titanium carbonitride-based cermets. Background technique [0002] TiCN-based cermet is a new type of tool material developed in the early 1970s. Its excellent performance fills the gap between WC-based cemented carbide and ceramics, and is especially suitable for steel at high speeds of 200-400m / min. Semi-finishing and finishing of cast iron. At present, the traditional sintering methods for producing TiCN-based cermets at home and abroad are mainly conventional vacuum sintering / atmosphere protection sintering, using heating elements such as graphite to generate heat, and heating the material from the surface to the inside through radiation, convection, and conduction. The heating method requires a long time to heat up and keep warm, so that the sintered TiCN-based cermet material can reach a certain strength and hardness. At present, the domestical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/64
Inventor 张厚安唐思文颜建辉许剑光李鹏南李颂文古思勇严迪科
Owner HUNAN UNIV OF SCI & TECH
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