CN103387215A

CN103387215A - Method for preparing TiCN powder by using tetrabutyl titanate and starch as Ti source and C source respectively

Info

Publication number: CN103387215A
Application number: CN2013103195492A
Authority: CN
Inventors: 吴一
Original assignee: Guilin University of Technology
Current assignee: Guilin University of Technology
Priority date: 2013-07-28
Filing date: 2013-07-28
Publication date: 2013-11-13
Anticipated expiration: 2033-07-28
Also published as: CN103387215B

Abstract

The invention discloses a method for preparing TiCN powder by using tetrabutyl titanate and starch as a Ti source and a C source respectively. The method comprises the following steps of: mixing tetrabutyl titanate and absolute ethyl alcohol in a mass ratio of 1:(0.01-4) to obtain a solution and mixing starch and ionized water in a mass ratio of 1:(5-8) to obtain a mixed liquid; mixing the solution and the mixed liquid uniformly according to the condition that the mass ratio of tetrabutyl titanate to starch is 1:(4-10); drying at 100-150 DEG C for 24-48 hours to obtain a precursor; heating the precursor to 1300-2000 DEG C in of a nitrogen the presence of atmosphere or ammonia decomposition atmosphere; preserving heat for 1-2 hours and carrying out carbon thermal reduction and nitridation to obtain the TiCN powder. The purities of the used chemical reagents and raw materials are analytically pure or above, the components of the prepared TiCN powder are controlled by the ratio of the added raw materials, and the purity and granularity of the TiCN powder are determined jointly by the material adding sequence and the preparation process. High-purity superfine TiCN can be prepared at low cost by using the method. Compared with the traditional preparation method of TiCN, the method provided by the invention has the characteristics of high uniformity of mixed raw materials, simple process, low synthesis temperature, short synthesis time, energy conservation, environmental friendliness and the like.

Description

Be respectively titanium source and carbon source with tetrabutyl titanate and starch and prepare the method for TiCN powder

Technical field

The invention belongs to TiCN Preparation Technique of Powders field, particularly a kind ofly be respectively titanium source and carbon source with tetrabutyl titanate and starch and prepare the method for TiCN powder.

Background technology

TiCN has high-melting-point, high rigidity, high-wearing feature and the special characteristics such as functional, not only be widely used in the reinforcement of grinding tool, cutting tool and matrix material etc., also as energy and material, be used widely, and have a wide range of applications in new function material.

Superfine Ti CN powder is badly in need of in the modern energy industrial development.Tradition TiO ₂With the synthetic TiCN powder of high temperature reduction after the carbon solid phase mixing, with low cost but powder preparation is thicker; Superfine Ti CN powder is mainly take pure titanium, titanium organism or gaseous titanium compound as raw material at present, and with the preparation of the techniques such as vapour deposition, plasma heating, raw material and process costs are high, make superfine Ti CN powder expensive.Research and the low-cost preparation of application superfine Ti CN new technology are highly significant.

The TiCN powder of large-scale industrialization production at present is mostly 2 ~ 5 μ m, along with the development of modernization industry, and the especially development of energy industry, increasing to the demand of ultrafine powder TiCN, superfine Ti CN has higher using value, has a extensive future.But the superfine Ti CN powder of existing market supply is because raw materials cost and preparation technology's cost are high and expensive.Therefore the research of carrying out low-cost preparation ultrafine powder TiCN has very large realistic meaning.

The preparation of superfine Ti CN powder is the focus of material supply section scholar research, existing raw material aspect, the aspect of research, process aspect is also arranged.But diverse ways has its relative merits for suitability for industrialized production.

Direct carborization is with simple substance carbon, metallic titanium powder (or TiH ₂) be raw material, at high temperature, in nitrogen-based atmosphere, the direct contact reacts of reactant generates TiCN, and product purity is high, the carbon metering is than large, and technological process is simple.But titanium valve is expensive, and the preparation of purification ultrafine titanium powder is more difficult; Reaction process is difficult to be controlled, and the TiCN that synthesizes needs further grinding broken, causes the purity drop of product, also will further purify, and makes the standby superfine Ti CN powder of this legal system obtain large-scale promotion.

Carbothermic method is the traditional method of TiCN powder suitability for industrialized production.This technique is with TiO ₂For the titanium source, take graphite, carbon black, activated carbon etc. as the C source, under high temperature, nitrogen group protecting atmosphere, TiO ₂Generated the TiCN powder by the C reduction.Advantage is: raw materials cost is low; Technique is simple, and production efficiency is higher; The granularity of TiCN is micron order.But raw material is poor by the mechanically mixing homogeneity; TiCN is also easily oxidized.With regard to present production technology, the powder that synthesizes can not meet the requirement of fine ceramics fully on granularity and purity.

Also have some other method to prepare superfine Ti CN, but generally have the high organic compound as high pure metal titanium valve, titanium of ingredient requirement etc.; Synthesis technique is complicated, and as need heating plasma, microwave heating, vapour deposition etc., appointed condition requires the problems such as high, and preparation method or complex process or output are limited, cause cost high.Exploitation high-level efficiency, TiCN ultrafine powder technology cheaply, remain the emphasis of countries nowadays scientist and business circles research.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and be respectively titanium source and carbon source with tetrabutyl titanate and starch and prepare the method for TiCN powder.

Concrete steps are:

(1) tetrabutyl titanate and dehydrated alcohol are mixed and make solution in 1:0.01 ~ 4 in mass ratio, starch and deionized water are mixed and make mixed solution in 1:5 ~ 8 in mass ratio.

(2) solution that step (1) is made and mixed solution evenly mix than 1:4 ~ 10 by tetrabutyl titanate and starch quality, and gained mixed solution under 100 ~ 150 ℃ dry 24 ~ 48 hours, make presoma.

(3) presoma that step (2) is made is heated to 1300 ~ 2000 ℃ under nitrogen atmosphere or ammonia dissolving atmosphere protection, be incubated 1 ~ 2 hour and carry out carbothermic reduction and nitrogenize, namely makes the TiCN powder.

The purity of described chemical reagent and raw material is analytical pure and above purity.

The composition of the prepared TiCN powder of the present invention is by adding proportioning raw materials to control, and the purity of powder and granularity are determined jointly by order of addition(of ingredients) and preparation technology.

The advantage of the inventive method:

(1) take starch as carbon source, take tetrabutyl titanate as the titanium source, through carbothermic reduction, high-purity, the superfine Ti CN of low-cost preparation.

(2) compare with the method that tradition prepares TiCN, have that raw material mixes, technique is simple, synthesis temperature is low, generated time is short and the characteristics such as energy-conserving and environment-protective.

Embodiment

Embodiment:

(1) with tetrabutyl titanate and dehydrated alcohol in mass ratio 1:3 mix and make solution, with starch and deionized water in mass ratio 1:7 mix and make mixed solution.

(2) solution that step (1) is made and mixed solution are by tetrabutyl titanate and starch quality than the even mixing of 1:7, and gained mixed solution under 125 ℃ dry 40 hours, make presoma.

(3) presoma that step (2) is made is heated to 1700 ℃ under the ammonia dissolving atmosphere protection; be incubated 1.5 hours and carry out carbothermic reduction and nitrogenize; namely make the TiCN powder, gained TiCN powder is that particle diameter is the superfine Ti CN powder of 150 ~ 300 nanometers through the testing graininess analysis.

The purity of described chemical reagent and raw material is analytical pure.

Claims

1. method for preparing the TiCN powder is characterized in that concrete steps are:

(1) tetrabutyl titanate and dehydrated alcohol are mixed and make solution in 1:0.01 ~ 4 in mass ratio, starch and deionized water are mixed and make mixed solution in 1:5 ~ 8 in mass ratio;

(2) solution that step (1) is made and mixed solution evenly mix than 1:4 ~ 10 by tetrabutyl titanate and starch quality, and gained mixed solution under 100 ~ 150 ℃ dry 24 ~ 48 hours, make presoma;

(3) presoma that step (2) is made is heated to 1300 ~ 2000 ℃ under nitrogen atmosphere or ammonia dissolving atmosphere protection, be incubated 1 ~ 2 hour and carry out carbothermic reduction and nitrogenize, namely makes the TiCN powder;

2. the method for preparing the TiCN powder according to claim 1 is characterized in that: the composition of prepared TiCN powder is by adding proportioning raw materials to control, and the purity of powder and granularity are determined jointly by order of addition(of ingredients) and preparation technology.