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Sosoloid toughened metal ceramic and preparation method thereof

A cermet and solid solution technology, which is applied in the field of solid solution toughened cermet and its preparation, can solve the problem of low fracture toughness and achieve the effects of good thermal shock resistance, short time and low energy consumption

Active Publication Date: 2013-10-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fracture toughness of commercial Ti(C,N)-based cermets is still low (about 6-9 MPa m 1 / 2 )

Method used

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  • Sosoloid toughened metal ceramic and preparation method thereof
  • Sosoloid toughened metal ceramic and preparation method thereof
  • Sosoloid toughened metal ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, including pre-solution treatment step, raw material mixing step, molding step, degreasing step and vacuum sintering step:

[0022] 1. Pre-solution treatment step: according to the mass percentage shown in Table 1, TiO 2 Powder, W powder and C powder are divided into three groups with equal amounts of A1, A2 and A3, wherein, the average particle size, purity and oxygen content of each raw material powder are shown in Table 2; after each group is mixed, A1 group, A2 group, Group A3 is further divided into three groups, a total of nine groups of raw material powder, using ball mill dry ball milling, to obtain nine groups of ball abrasives B1 ~ B9, of which three groups of ball abrasives B1, B2, B3 correspond to the raw material powder of group A1, B4, B5, The three groups of ball abrasives of B6 correspond to the raw material powder of group A2, the three groups of ball abrasives of B7, B8 and B9 correspond to the raw material powder of group A3, and the spec...

Embodiment 2

[0047] 1. Pre-solution treatment step: TiO 2 Powder, W powder and graphite powder are batched according to the mass percentage shown in A3 in Table 2, and then ball milled according to the process shown in B9 in Table 3. Put the ball abrasive into the graphite burning boat, carry out carbothermal reduction treatment according to the P9 process in Table 4 in the vacuum furnace, and obtain the nominal composition of (Ti 0.62 , W 0.38 ) the pre-solid solution powder of C;

[0048] 2. Raw material mixing step: according to the mass percentage shown in Table 9, the (Ti 0.62 , W 0.38 ) C solid solution powder was mixed with TiC powder, Mo powder, graphite powder and Ni powder respectively, and then wet milled on a ball mill with a ball-to-material ratio of 6:1, a rotational speed of 150 rpm, and a time of 36 hours to obtain F0, F1, F2, and F3 , F4, F5 and F6 a total of seven groups of mixed slurry, wherein, F0 does not contain (Ti 0.62 , W 0.38 ) C solid solution powder formul...

Embodiment 3

[0060] 1. Pre-solution treatment step: according to the mass percentage of A2 in Table 2, TiO 2 Powder, W powder and graphite powder were mixed, and ball milled according to the B5 process in Table 3. Then put the ball abrasive into the graphite burning boat, carry out carbothermal reduction treatment in the vacuum carbon tube furnace, the temperature is 1370 ℃, keep the temperature for 2h, and the nominal composition is (Ti 0.77 , W 0.23 ) the pre-solid solution powder of C;

[0061] 2. Raw material mixing step: according to the mass percentage shown in Table 12, the (Ti 0.77 , W 0.23 ) C solid solution powder was mixed with TiC powder, Mo powder, graphite powder and Ni powder respectively, and wet milled on a ball mill with a ball-to-material ratio of 5:1, a rotating speed of 200rpm, and a time of 24h to obtain I1, I2, I3, I4, I5, I6, I7, I8 and I9 have a total of nine groups of mixed slurry, put the mixed slurry in a drying oven for drying, the drying temperature is 85 ...

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Abstract

The invention discloses sosoloid toughened metal ceramic and a preparation method thereof. The sosoloid toughened metal ceramic is prepared from the materials through mechanical ball-milling, die forming and vacuum sintering. The sosoloid toughened metal ceramic comprises a hard phase and a bonding phase, wherein the hard phase comprises two ceramic phases; the bonding phase is Ni-Mo-W sosoloid with the following components in percentage by weight: not less than 8.8% and not more than 67.2% of (Ti(1-x), Wx) C, not less than 0% and not more than 58.4% of TiC, not less than 10% and not more than 15% of Mo, not less than 0.8% and not more than 1.2% of C, not less than 20% and not more than 32% of Ni, wherein x is not smaller than 0.17 and not bigger than 0.38. The preparation method of the sosoloid toughened metal ceramic is capable of synthesizing (Ti(1-x), Wx) C sosoloid by adopting mechanical ball-milling and low-temperature carbon heat reducing, short is time, small in energy consumption, capable of preparing the blank by adopting the existing powder metallurgy method, free of an improving device and an improving process, and simple and economical to implement. Moreover, the prepared sosoloid toughened metal ceramic has hardness of 89 HRA-92 HRA, bending strength not lower than 1850 MPa, breaking tenacity not lower than 13.4MPa.m1 / 2 and good application prospect in a dry type high-speed cutting tool and a heat working mould.

Description

technical field [0001] The invention belongs to cermets and a preparation method thereof, in particular to a solid solution toughened cermets and a preparation method thereof. Background technique [0002] Ti(C,N)-based cermet is a new type of particle-reinforced composite material that appeared in the early 1970s. It has good high-temperature red hardness, wear resistance, thermal stability and anti-adhesion. Its low density makes it an ideal material for cutting tools and thermoforming dies. In the metal cutting process, increasing the cutting rate can greatly improve the processing efficiency, and high-speed cutting has become an important development direction of the machinery manufacturing industry. Under the condition of high cutting speed and intermittent cutting, the tool material is required to have excellent thermal shock resistance due to the periodic thermal shock caused by sudden temperature changes. When used for hot extrusion of high-melting-point metal prof...

Claims

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Application Information

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IPC IPC(8): C22C29/06C22C1/05
Inventor 熊惟皓张国鹏杨青青姚振华陈珊陈肖黄斌
Owner HUAZHONG UNIV OF SCI & TECH
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