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A two-step process for producing silicon carbide titanium by combining high temperature sintering and self-propagating heat

A silicon carbide titanium, high temperature sintering technology, used in the chemical industry, sustainable manufacturing/processing, climate sustainability, etc., can solve the problems of low product purity, high risk, and high reaction conditions, and achieve high product purity. , simple process conditions, avoid the effect of impurity

Active Publication Date: 2022-05-20
辽宁中色新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas phase synthesis method is prone to incomplete reaction, and the simple substance and hydrogen are easily combined to form a heterogeneous phase, the product purity is not high, and the risk is high
The solid phase synthesis method requires high temperature, long sintering time, high reaction conditions, and easy to form TiC heterophase; and the production process is complicated and the cost is high

Method used

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  • A two-step process for producing silicon carbide titanium by combining high temperature sintering and self-propagating heat
  • A two-step process for producing silicon carbide titanium by combining high temperature sintering and self-propagating heat

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Select raw materials: titanium powder has a purity of 99.8% and a particle size of 325 mesh; silicon powder has a purity of 99.99% and a particle size of 400 mesh; graphite powder has a purity of 99.99% and a particle size of 325 mesh; sodium nitrate has a purity of 99.9% and a particle size of 200 mesh; the purity of magnesium powder is 99.5%, and the particle size is 325 mesh;

[0028] With 8.43kg of silicon powder and 7.21kg of graphite powder (molar ratio 1:2), add binder carboxymethyl cellulose 78.2g, pack in 20L vacuum ball mill, charge 5kg each time, mix for 15 hours; The good material is weighed according to 500g per portion, pressed into a round cake with a 400-ton hydraulic press under a pressure of 20MPa, put into a vacuum resistance sintering furnace for firing, and each charge is 50kg; turn on the vacuum pump, and start to heat up after the vacuum degree reaches 5Pa-10Pa , the transmission power is 120kw; the temperature reaches 1200°C, keep warm for 5 ...

Embodiment 2

[0031] (1) Select raw materials: titanium powder has a purity of 99.8% and a particle size of 325 mesh; silicon powder has a purity of 99.99% and a particle size of 400 mesh; graphite powder has a purity of 99.99% and a particle size of 325 mesh; sodium nitrate has a purity of 99.9% and a particle size of 200 mesh; the purity of magnesium powder is 99.5%, and the particle size is 325 mesh;

[0032] With silicon powder 8.43kg and graphite powder 7.21kg (molar ratio 1:2), add binder carboxymethyl cellulose 78.2g, pack in 20L vacuum ball mill, charge 6kg each time, mix materials for 15 hours; The good material is weighed according to 500g per portion, pressed into a round cake with a 400-ton hydraulic press under a pressure of 22MPa, put into a vacuum resistance sintering furnace for firing, and each charge is 80kg; turn on the vacuum pump, and start to heat up after the vacuum reaches 5Pa-10Pa , the transmission power is 120kw; the temperature reaches 1200°C, keep warm for 5 hou...

Embodiment 3

[0035] (1) Select raw materials: titanium powder has a purity of 99.8% and a particle size of 325 mesh; silicon powder has a purity of 99.99% and a particle size of 400 mesh; graphite powder has a purity of 99.99% and a particle size of 325 mesh; sodium nitrate has a purity of 99.9% and a particle size of 200 mesh; the purity of magnesium powder is 99.5%, and the particle size is 325 mesh;

[0036] With silicon powder 8.43kg and graphite powder 7.21kg (molar ratio 1:2), add binder carboxymethyl cellulose 78.2g, pack in 20L vacuum ball mill, each charge 8kg, mix 15 hours; The good material is weighed according to 500g per portion, pressed into a round cake with a 400-ton hydraulic press under a pressure of 25MPa, put into a vacuum resistance sintering furnace for firing, and each charge is 120kg; turn on the vacuum pump, and start to heat up after the vacuum degree reaches 5Pa-10Pa , the transmission power is 120kw; the temperature reaches 1200°C, keep warm for 5 hours, and the...

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Abstract

A two-step process of high-temperature sintering and self-propagating heat combined to produce silicon carbide titanium. Silicon powder and graphite powder are added to the binder and mixed in a vacuum ball mill; the mixed material is pressed into a round cake and placed Firing in a vacuum resistance sintering furnace to obtain a silicon-carbon alloy; add titanium powder and silicon carbon to sodium nitrate and a binder, put them into a vacuum ball mill, and mix the materials under the protection of argon; press the mixed materials into a round cake , loaded into a vacuum self-propagating furnace, the round cakes are stacked layer by layer, and magnesium powder is loaded as an ignition agent; vacuuming, power transmission to heat up, igniting the magnesium powder, and igniting all the round cakes through heat transfer, a self-propagating reaction occurs, and self-propagating After the reaction is completed, the temperature of the furnace is lowered to obtain a silicon carbide titanium block. The advantages are: simple and controllable process conditions, high product purity, adding sodium nitrate in the self-propagating reaction process, so that the self-propagating reaction heat can meet the raw material reaction requirements, and the alloy rate can reach 100%.

Description

technical field [0001] The invention relates to a two-step process of high-temperature sintering and self-propagating thermal combination for producing silicon carbide titanium. Background technique [0002] Titanium silicon carbide (Ti 3 SiC 2 ) has many advantages of metals and ceramics. Like metals, it is a good conductor of electricity and heat. It is easy to process, soft, insensitive to thermal shock, and shows plasticity at high temperatures; Strength exceeds all superalloys. Titanium silicon carbide is widely used and is a high-temperature material with important research value and application prospect. [0003] At present, the methods for synthesizing titanium silicon carbide mainly include gas phase synthesis and solid phase synthesis. The gas-phase synthesis method is prone to incomplete reaction, and the simple substance and hydrogen are easily combined to form a heterogeneous phase, the product purity is not high, and the risk is high. The solid-phase synth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/65
CPCC04B35/5615C04B35/622C04B35/651C04B2235/428C04B2235/425C04B2235/404C04B2235/401C04B2235/3201C04B2235/5436Y02P20/10
Inventor 张洪涛
Owner 辽宁中色新材科技有限公司