Cast material and method of manufacturing cast material
a technology of casting material and manufacturing method, which is applied in the field of casting material and a manufacturing method of cast material, can solve the problems of difficult to use the cast material obtained by the casting method described in patent document 1 and the liable to be broken cast material obtained by the cast method, and achieves excellent corrosion resistance and wear resistance, high bending strength, and high hardness
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example 1
[0082]A mixed powder was obtained by dry mixing 20 wt % of a Mo2NiB2-type composite boride and, 80 wt % of a Ni-based self-fluxing alloy (composition: Cr: 10 wt %, B: 2 wt %, Si: 2.7 wt %, C: 0.4 wt %, Fe: 2 wt %, Ni: the balance). Next, the obtained mixed powder was placed in a crucible, and fused by using a vacuum casting machine (TCP-5250, manufactured by Tanabe Kenden Co., Ltd.) and by raising the temperature to 1200° C. in a high-frequency fusion furnace to obtain a fused mixture; the obtained fused mixture at 1200° C. was poured into a mold heated to 400° C., and thereafter air cooled to room temperature to obtain a cast material. In this case, the temperature of the fused mixture was measured after 2 minutes from the taking out of the fused mixture from the high-frequency fusion furnace and the temperature was found to be 400° C. In other words, the fused mixture was cooled from 1200° C. to 400° C. in 2 minutes after being taken out from the high-frequency fusion furnace; in ...
example 2
[0085]A mixed powder was obtained by dry mixing 10 wt % of a Mo2NiB2-type composite boride and, 90 wt % of a Ni-based self-fluxing alloy (composition: B: 2.3 wt %, Si: 7.1 wt %, C: 0.06 wt % or less, Fe: 1.5 wt %, Ni: the balance). Next, an ingot was obtained by sintering in vacuum the obtained mixed powder by using a vacuum furnace under the conditions of 1160° C. and 30 minutes. Then, a fused mixture was obtained by raising the temperature of the ingot in the air to 1200° C. to fuse the ingot by using an air atmospheric furnace, and the obtained fused mixture at 1200° C. was poured into a mold at room temperature of 20° C. and subsequently air cooled to obtain a cast material. In this case, the temperature of the fused mixture was measured after approximately 1 minute from the taking out of the fused mixture from the air atmospheric furnace and the temperature was found to be 400 to 500° C. In other words, the fused mixture was cooled from 1200° C. to 400 to 500° C. in 1 minute af...
example 3
[0088]A cast material was obtained in the same manner as in Example 2 except that there was used a mixed powder prepared by dry mixing 15 wt % of a Mo2NiB2-type composite boride and 85 wt % of a Ni-based self-fluxing alloy (composition: B: 2.3 wt %, Si: 7.1 wt %, C: 0.06 wt % or less, Fe: 1.5 wt %, Ni: the balance), and the respective measurements were performed in the same manner as in Example 2. The backscattered electron images taken by a scanning electron microscope (SEM) for the respective measurements are shown in FIG. 4(A) and FIG. 4(B). Here, FIG. 4(B) is an enlarged image obtained by enlarging a portion of FIG. 4(A). In the backscattered electron images of FIG. 4(A) and FIG. 4(B), the white regions are made of a boride (hard phase particle), the black regions are made of impurities, and the rest gray region is made of a Ni-based alloy. In the gray region, the elongate shape portion (in FIG. 4(B), the portion indicated by an arrow) is shown in deeper color due to the differe...
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Abstract
Description
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