Sintered body and die for hot extrusion molding each using such sintered body

A sintered body, hot extrusion technology, applied in metal extrusion dies, metal extrusion forming tools, metal extrusion and other directions, can solve the problem of high sliding characteristics, high strength, and damage size of extruded material 6, etc. problems, to achieve the effects of suppressing damage and dimensional problems, improving continuous molding time, and improving oxidation prevention effect

Inactive Publication Date: 2010-10-06
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] However, when the inner peripheral portion 101b of the through-hole 101a made of high-speed steel proposed in Patent Documents 1 and 2 is coated with 1 μm of TiC, the thermal expansion coefficient difference between the high-speed steel of the base material and the coated TiC is large. Easy to peel off the coating
In addition, TiC tends to oxidize in an environment above 450°C, so there is a problem of thermal deterioration, that is, TiC, which is a high-hardness material, undergoes a substitution reaction to become TiO with significantly deteriorated hardness. 2
[0019] In addition, Patent Document 3 proposes to coat the inner peripheral surface 101b of the through-hole 101a with a ceramic layer in the range of 2 to 10 μm by electric discharge machining, wherein the thermal expansion coefficient difference between the base material and the coated ceramic layer is large , so the peeling of the coating cannot be avoided
[0020] In addition, in Patent Document 4, the inner peripheral surface 101b of the through-hole 101a of the SKD material is thickened with a carbide-based cermet in the range of 4 to 15 μm in thickness. Among them, the composition of the carbide-based cermet is from Cr 3 C 2 , NbC, WC, TiC, and SiC carbide-based ceramics, choose one or more than two kinds, but any one of the carbide-based ceramics only contains 10 to 30 wt%, even if it is used, it cannot be obtained, for example, as high as aluminum alloy. sliding properties
Therefore, when the aluminum alloy extruded material 6 is formed, the inner peripheral surface 101b of the through-hole 101a used as the induction part is easy to condense aluminum, so that the problem of damage cannot be avoided, and the formed extruded material 6 is damaged due to abrasion. damage and size inaccuracies
[0021] In addition, the main body of the hot extrusion molding die 101 proposed in Patent Document 5 is made of zirconium-based ceramics or silicon nitride ceramics, because of the fact that sufficient high strength to withstand hot extrusion molding of aluminum alloys cannot be obtained. For one reason, the inner peripheral surface 101b of the through-hole 101a cannot be avoided, or the problem of damage to the formed extruded material 6 due to abrasion and inaccurate dimensions cannot be avoided.
[0022] In addition, Patent Document 6 discloses a method for producing a TiCN-TiC-based cermet sintered body as a material suitable for casting materials in molten aluminum. The reason for thermal deterioration, that is, TiC, which is a high-hardness material, undergoes a substitution reaction and becomes TiO with significantly deteriorated hardness. 2 , so it is not suitable as a mold material for hot extrusion molding such as aluminum alloy

Method used

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  • Sintered body and die for hot extrusion molding each using such sintered body
  • Sintered body and die for hot extrusion molding each using such sintered body
  • Sintered body and die for hot extrusion molding each using such sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Each powder was divided into six levels of content to prepare a sintered body made of TiCN-based cermet as a base material of the hot extrusion molding die 1 of the present invention. The TiCN powder is mixed with the fine TiCN powder with an average particle size of 0.5 μm and the coarse TiCN powder with an average particle size of 1.7 μm at a ratio of 8:2 in a specified amount, and the balance is a specified amount of TiCN with an average particle size of 1.2 μm. TaC powder, 1.6μm Ni powder and 1.4μm Cr powder are put into a ball mill made of SUS, so that the crushing ball made of SUS with a size of 2Φ5 is equivalent to the same capacity of the total powder, plus twice the volume Volume of ethanol and 3% paraffin wax based on the total powder mass ratio were pulverized and mixed for 48 hours (hr) to prepare a slurry.

[0085] Here, when the total content of the aforementioned TiCN, TaC, Ni, and Cr is taken as 100% by mass, the respective contents are TiCN=63% by mass,...

Embodiment 2

[0111] make Figure 4 The hot extrusion molding dies 1 and 101 shown in (a) and (b) were mounted on hot extrusion molding apparatuses 11 and 111 for hot extrusion molding, and the hot extrusion molding dies 1 and 101 were evaluated. What used the sintered bodies of sample Nos. 1-3 of Example 1 to make the die 1 for hot extrusion molding was sample No. 11-13 of the embodiment of the present invention, and used sample No. 4, The sintered bodies of 6 are sample Nos. 14 and 15 outside the scope of the present invention.

[0112] As a comparative example, the material of the hot extrusion molding die 101 is made of ZrO 2 : 94% by mass, Y 2 o 3 : Zirconium ceramics composed of 6% by mass, this is sample No.16.

[0113] Also, as a comparative example, such as Figure 5 As shown, the main body of the hot extrusion molding die 101 is SKD61, and the inner peripheral surface 101b of the through hole 101a is made of NiCr / Cr 3 C 2 The cermet material composed of / NbC forms the reinfo...

Embodiment 3

[0130] When the inner peripheral surface 1b of the through-hole 1a of the hot extrusion molding die 1 of the present invention is formed with and without the amorphous film 1c, and when the amorphous film 1c is alumina or silicon carbide, it is further confirmed that its production thickness t is In the case of the range of 0.1 to 1.5 μm, the effect on the continuous molding time in a high temperature environment.

[0131] The sintered body constituting the die 1 for hot extrusion molding had the same composition and shape as Sample No. 12 of Example 2. Then, if figure 1 As shown, an amorphous film 1c of aluminum oxide and silicon carbide is formed on the inner peripheral surface 1b of the through-hole 1a to have a thickness t of six levels of 0.1, 0.2, 0.5, 1.0, 1.2, and 1.5 μm, and one film is produced for each And install it on the hot extrusion forming device 11, after carrying out preliminary heating for 1 hr, implement continuous forming to the extruded material 6 of a...

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Abstract

By using a sintered body composed of 58-92.5% by mass of TiCN, 0.01-1% by mass of Ti, 0.01-2% by mass of TiC, 0.01-2% by mass of TiN and the balance of TaC, Ni and Cr, there can be obtained a sliding member, film-forming material and die for hot extrusion molding which exhibit high strength, high hardness, high toughness and high sliding properties in an environment of about 400-600 DEG C, and a hot extrusion molding apparatus using such a die for hot extrusion molding.

Description

technical field [0001] The present invention relates to a sintered body, a method for producing the sintered body, a sliding member using the sintered body, a film-forming material, a hot extrusion molding die, a hot extrusion molding device and a hot extrusion molding method using the hot extrusion molding die . Background technique [0002] Conventionally, when forming extruded materials by hot extrusion of aluminum alloys, etc., such as Figure 5 and 9 As shown, from the through-hole 101a which becomes the induction part of the hot extrusion molding die 101 constituting the bearing part of the die case (die case) 102 installed in the hot extrusion molding device 111, it will be heated to about 400 to 500 °C aluminum alloy slab 5 is extruded to form an extruded material 6 of a desired shape. [0003] Moreover, as the material of the die 101 for hot extrusion molding, superhard alloy (hereinafter referred to as superhard) and SKD61 are usually used. Due to superhardness, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/04B21C25/00B21C25/02B22F1/00C22C1/05
CPCC22C29/04B22F2998/10B21C25/02B22F2003/242B22F5/10B22F2003/247B21C25/025B22F1/107B22F9/026B22F3/04B22F3/1007B22F3/24
Inventor 浜岛浩
Owner KYOCERA CORP
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