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Surface particle reinforced composite material layer of iron cast member and preparation method thereof

A technology for reinforcing composite materials and castings. It is applied to the surface particle reinforced composite material layer of iron castings and its preparation field. It can solve the problems of uneven surface of composite materials, poor penetration of molten metal, internal pores and slag inclusions, etc., and achieve high The effect of combining strength, low cost and short production cycle

Inactive Publication Date: 2012-01-18
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] No matter at home or abroad, many problems have been encountered such as uneven surface of composite materials, pores and slag inclusions, poor penetration of molten metal, sand sticking, erosion, etc., but there is little research on iron castings, and most of them are concentrated on non-ferrous metals. Alloy

Method used

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  • Surface particle reinforced composite material layer of iron cast member and preparation method thereof
  • Surface particle reinforced composite material layer of iron cast member and preparation method thereof
  • Surface particle reinforced composite material layer of iron cast member and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Embodiment 1: the alloy powder composition and content are: 19.2 parts of tungsten carbide, 47.5 parts of high-carbon ferrochromium, 24.7 parts of gray cast iron powder, 3 parts of calcium-silicon alloy, 1 part of sodium fluoride, rare earth magnesium alloy (more magnesium-containing nodulizer) 2 parts, borax 2.6 parts; alloy powder particle size: 0.2mm; pouring temperature is 1370°C, lambda value is 14. During preparation, mix the alloy powder evenly with polyvinyl alcohol (PVA) colloid, adjust it into a paste, coat it on the bottom surface of the casting mold molded with water glass surface sand, dry it with a blowtorch for 5-10 minutes, close the box, and then put the warp into the sky The molten iron smelted in the furnace is poured by top injection and cooled naturally. The layer phase composition of the composite material obtained in this way is mainly WC, (Cr, Fe) 7 C 3 , eutectic austenite and martensite, WC in the as-cast structure is white square, (Cr, Fe) 7...

Embodiment 2

[0036] Embodiment 2: the alloy powder composition and content are: 20 parts of tungsten carbide, 50 parts of high-carbon ferrochromium, 25 parts of gray cast iron powder, 1 part of calcium-silicon alloy, 1 part of sodium fluoride, rare earth magnesium alloy (more magnesium-containing Nodulizer) 1 part, borax 2 parts; alloy powder particle size: 0.3mm; pouring temperature 1370°C, lambda value 14. During preparation, mix the alloy powder evenly with polyvinyl alcohol (PVA) colloid, adjust it into a paste, and make a paste alloy with a size of 30×30×3mm, and place it in a rectangular parallelepiped with a size of 30×30×170mm. The middle part of the mold is then poured with molten iron to form a sample in which the middle part is the cast iron matrix and the two ends are the cast iron matrix. Then process it into a round short sample in the GB228-76 standard, and do a tensile test on a WE-10 universal tensile testing machine. Due to the addition of alloying elements, the bonding ...

Embodiment 3

[0037] Embodiment 3: the composition and content of alloy powder are: 20 parts of tungsten carbide, 47 parts of high-carbon ferrochromium, 25 parts of gray cast iron powder, 2 parts of calcium-silicon alloy, 1 part of sodium fluoride, rare earth magnesium alloy (containing more magnesium nodulizer) 3 parts, borax 2 parts; alloy powder particle size: 0.2mm; pouring temperature is 1370°C, lambda value is 14. During preparation, adopt the preparation method of embodiment 2, and do compression test on WE-10 type universal tensile testing machine. The addition of alloying elements can increase the shear strength of the infiltrated layer and the matrix, causing the specimen to fracture on the gray cast iron matrix, with a compressive strength of 592 MPa, as shown in Figure 4(c), black is the composite material layer 2 , the others are matrix 1.

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Abstract

The invention discloses a surface particle reinforced composite material layer of a cast member. The surface particle reinforced composite material layer of the cast member comprises the following components in percentage by mass: 2.96-3.58% of C, 15.41-24.77% of Cr, 18.41-24.92% of W, 0.61-1.02% of Ca, 1.23-2.11% of Si, 0.12-0.84% of B, 0.41-2.52% of Mg and the balance of Fe. Meanwhile, the invention further discloses a preparation method of the composition material layer. By utilizing the technical scheme provided by the invention, a WC (Wolfram Carbide) high chromium cast iron composite material layer having uniformity, compaction, flat surface and 2-5 mm in thickness can be obtained from gray cast iron and graphite cast iron; and the problem that WC particles easily fall off in the process of being directly cast is overcome.

Description

technical field [0001] The invention relates to a particle-reinforced composite material layer on the surface of a cast iron piece and a preparation method thereof. Background technique [0002] The manufacture of casting surface composite materials originates from the coating casting process, which is called cast infiltration or infiltration. This process combines traditional casting and material surface composite strengthening technology. The generated waste heat reduces energy consumption, simplifies the process, realizes surface alloying, and greatly improves the hardness, wear resistance, and heat resistance of the casting surface. This method was founded by American Davis et al. in 1913, and developed in the 1970s. Countries such as the U.S., Germany, South Africa, and Japan all have more in-depth research in this respect. [0003] In recent years, China has also attached great importance to the cast infiltration surface particle reinforced composite materials, especi...

Claims

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Application Information

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IPC IPC(8): C22C38/34C22C38/32C22C30/00B22D19/16
Inventor 许斌袁兴栋杨胶溪冯承明
Owner SHANDONG JIANZHU UNIV
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